3.17 EXPANSION AND CONTRACTION JOINTS IN BRICK OR BLOCK WALLS ETC.
3.18 FIXING TO VERMICULITE BLOCK PARTITIONS
3.19 RAKING OUT AND POINTING FLASHINGS, ETC.
3.20 MASTIC POINTING
3.21 TOLERANCES
3.22 DRY WEATHER
3.23 WET WEATHER
3.24 HANDLING & STORAGE
3.25 PROTECTION AND CLEANING UP
Nội dung
Archetype Vietnam Ltd Saigon Pearl development project - phase 2a SECTION 01 : BRICKWORK AND BLOCKWORK GENERALLY 1.1 SCOPE 1.2 STANDARDS AND CODES OF PRACTICE 1.3 SUBMISSIONS 1.3.1 SUBMISSION GENERALLY 1.3.2 DATA SUBMISSIONS 1.3.3 SAMPLES 1.3.4 SAMPLE PANELS 1.4 QUALITY 1.4.1 QUALITY ASSURANCE - QUALITY CONTROL 1.4.2 INSPECTION MATERIALS 2.1 CEMENT 2.2 SAND 2.3 LIME 2.4 LIME PUTTY 2.5 WHITE OR COLORED CEMENT 2.6 WATER 2.7 ADDITIVES AND ADMIXTURES 2.8 MORTAR MIXES 2.9 USE OF MORTAR 2.10 BRICKS GENERALLY 2.11 CLAY BRICKS 2.12 FACING BRICKS 2.13 ENGINEERING BRICKS 2.14 FIRE BRICKS .8 2.15 CONCRETE BLOCKS 2.16 HOLLOW CLAY BLOCKS 2.17 SOLID VERMICULITE BLOCKS 2.18 WOODWOOL SLABS 2.19 GLASS BLOCKS 2.20 LINTELS 2.21 BLOCKWORK REINFORCEMENT 2.22 DAMP PROOF COURSES 2.23 WALL TIES WORKMANSHIP 10 3.1 MORTAR 10 3.2 LAYING OF BRICKS OR HOLLOW CLAY BLOCKS 10 3.3 LAYING OF SOLID CONCRETE BLOCKS 11 3.4 LAYING OF HOLLOW CONCRETE BLOCKS FOR FLOOR OR ROOF SLABS 11 3.5 LAYING OF HOLLOW CONCRETE BLOCKS FOR WALLS 11 3.6 LAYING & JOINTING OF FACE WORK 11 3.7 LAYING OF GLASS BLOCKS 12 3.8 BONDING OF WALLS AND PARTITIONS 12 3.9 BUILDING IN, CUTTING AND PINNING 12 3.10 CHASES, HOLES, RECESSES, AND REVEALS IN WALLS ETC 13 3.11 PINNING UP AND SEALANTS 13 3.12 BEDDING AND POINTING FRAMES 13 3.13 BRICK / BLOCK REINFORCEMENT 13 3.14 RESTRAINTS AND TIES TO STRUCTURAL ELEMENTS 14 3.15 TYPICAL STEEL STIFFENERS SCHEDULE FOR BRICK / BLOCK WALL PARTITION 14 3.16 DAMP PROOF COURSE 14 3.17 EXPANSION AND CONTRACTION JOINTS IN BRICK OR BLOCK WALLS ETC 15 3.18 FIXING TO VERMICULITE BLOCK PARTITIONS 15 3.19 RAKING OUT AND POINTING FLASHINGS, ETC 15 3.20 MASTIC POINTING 15 3.21 TOLERANCES 15 3.22 DRY WEATHER 15 3.23 WET WEATHER 15 3.24 HANDLING & STORAGE 15 3.25 PROTECTION AND CLEANING UP 16 Date:29.05.06 Revision Tender Specifications - Section 01: Brickwork and blockwork - Page 1/16 Archetype Vietnam Ltd Saigon Pearl development project - phase 2a GENERALLY 1.1 SCOPE a) Specified in this section: Block construction using units made of concrete or burnt clay, including accessories such as wall ties, lintels, spouts, and the necessary operations of laying, jointing, building-in, cleaning and the like b) Related sections: Section 20: Fire rated assembly and enclosure c) Specified in other sections: Plastering, paving and tiling: Section 05 External and internal stone works: Section 07 1.2 STANDARDS AND CODES OF PRACTICE a) Unless otherwise specified, all works under the present section shall be executed in accordance with the requirements and recommendations of the appropriate British Standards and Codes of Practice, together with all amendments, that are current at the date of the tender, for materials and workmanship and with particular reference to: BS 5628-1: 1992, and BS 5628-3: 2001 1.3 SUBMISSIONS 1.3.1 Submission generally a) Manufacturers catalogues, test certificate, installation method, material samples and shop drawings, sample panels and prototypes for all relevant materials and equipments shall be submitted to the Construction Manager for review or approval b) The extent of information or samples required shall be adequate and sufficient to demonstrate that the proposed system end materials are in compliance with the contract requirements However, the Construction Manager can request the contractor to submit any additional or supplementary information to substantiate the performance of the proposed system or material c) All submissions are to be made in English language d) Documents larger than A3 size shall be submitted in copies e) No bulk materials and systems ordering work shall proceed prior to the Construction Manager’s confirmation of no adverse comment on the submitted information, samples, sample panels or prototypes It is the contractors sole responsibility to ensure that the required materials or systems can be ordered according to the contractor’s master program f) Where the Construction Manager requires prototypes to be submitted by the Contractor, the Contractor shall be solely responsible for the consequences of delay resulting from failure to allow adequate time for the assessment and approval of submissions, or from the rejection of submissions which not comply with the Contract documents g) No claim for any additional time or cost due to any delayed submission of a satisfactory system will be entertained Date:29.05.06 Revision Tender Specifications - Section 01: Brickwork and blockwork - Page 2/16 Archetype Vietnam Ltd Saigon Pearl development project - phase 2a h) The time required for examination of each submission shall be fifteen (15) working days 1.3.2 Data submissions a) Before any bulk materials and systems ordering work commences, obtain and submit in writing statements from all suppliers, giving the following unless otherwise required by the Construction Manager: Particulars of the supplier's experience in the required type of work Production capacity for material of the required type, sizes and quantity Material source of supply Lead times for delivery of the material to the site Technical specifications Test reports certified by an independent testing authority showing compliance with the criteria of the specified tests / with this specification including: i Compressive strength, ii Transverse strength, iii Characteristic of expansion, iv Fire resistance rating 1.3.3 Samples a) Before any bulk materials and systems ordering work commences, submit not less than six (6) samples of the following: Units of each type and size, representing the total range of texture, surface irregularities (including defective arises), and regularity of shape and size Each type and size of stiffeners Sand (minimum 0.5 L) b) Label each sample for identification, giving the brand name and product name, manufacturer's code reference, date of manufacture, and the like c) Items used in the works shall be in accordance with an approved sample, or within a range defined by approved samples, as determined by the Construction Manager, otherwise such items shall be liable to rejection d) Keep approved samples in good condition on the site until Practical Completion 1.3.4 Sample panels a) Before any work of the types listed bellow commences, prepare in suitable positions, or where specified or directed by the Construction Manager, sample panels of sufficient area of each of the items listed below including samples of the specified junction details, stiffeners, etc.: Item external concrete block wall Inter-tenancy brick wall Panel size * Number of panels linear meters 1 1 linear meters Location / inclusion Junction with inter-tenancy brick wall Junction with internal brick partition Window sill Junction with reinforced concrete wall Door lintel Junction with internal brick partition Door lintel linear meters Internal brick linear meters partition * Panels to be full height of typical floor to show junction with slabs/beams b) Do not proceed with further installation until approval of the sample panels has been granted by the Construction Manager Date:29.05.06 Revision Tender Specifications - Section 01: Brickwork and blockwork - Page 3/16 Archetype Vietnam Ltd Saigon Pearl development project - phase 2a c) The sample panels, when approved by the Construction Manager, shall form the bench mark for all proceeding work d) Preserve each panel when approved until all work of its type is complete e) An approved sample panel, if suitably located, may be permitted to be incorporated into the works Otherwise remove all traces on completion of the works 1.4 QUALITY 1.4.1 Quality assurance - quality control a) During the construction phase, the Contractor shall provide a written certification to the Construction Manager that they have completed a quality assurance check on the specifications and drawings b) Before commencement of the works, submit to the Construction Manager for approval a written description of each quality management system, with specific reference to the following: the relevant standard; where the standard provides for classification levels, the level adopted; the scope and field of application; the personnel involved and their responsibilities; Inspection Test Plans (ITPs) the various procedures required by the standard including those for management review, contract review, design and document control, process control, inspection and testing, etc.; other relevant information 1.4.2 Inspection a) Give sufficient notice to the Construction manager so that inspection may be made of the works at the following times: Lintels and sill in position Items to be built in: Located in their correct positions, bolts and structural steelwork b) Where works are to be carried out in stage or progressively throughout the project have the above inspections for each stage or area c) Minimum notice required: working days MATERIALS 2.1 CEMENT a) Portland cements shall conform to BS EN 197 (Cement: Part Unless otherwise stated the cement shall be of Ordinary Portland Cement and be delivered in the original sealed bags of the manufacturer or in acceptable bulk containers b) Where special requirements are shown on the drawings for other types of cement, they shall conform to British Standard requirements as follows: Portland Blast Furnace Cement Low Heat Portland Cement Sulfate Resisting Portland Cement High Slag Portland Blast Furnace Cement : : : : BS 146: 2002 BS 1370: 1979 BS 4027: 1996 BS 4246: 1991 These other types of cement shall only be used with the written approval of the Construction Manager c) High Alumina Cement shall not be used in any part of the works unless specified Date:29.05.06 Revision Tender Specifications - Section 01: Brickwork and blockwork - Page 4/16 Archetype Vietnam Ltd Saigon Pearl development project - phase 2a d) All cement shall be from a manufacturer of good repute and shall be subject to the Construction Manager’s approval e) Each consignment of cement shall be accompanied by a manufacturer’s test certificate showing the quantity, delivery note number, date consigned and the results of recent tests on representative samples f) All cement to be used on the works shall be supplied from the same brand and source unless alternate brands or sources are approved by the Construction Manager Cement of different approved brands shall be separately stacked or stored and shall not be used in the same pour g) The Construction Manager may require that any cement, delivered to the site, or elsewhere, for used in the works shall be sampled and tested in accordance with all Current series of BS 4550: 1978 Any batch of cement so tested which fails to comply with this Specification will be rejected No deliveries in bulk shall be commenced until samples are approved h) All cement to be used on to the site or elsewhere for the works shall be delivered in the original sealed and branded bags of the manufacturer or in bulk containers endorsed by the Construction Manager i) Cement, unless delivered in bulk, shall be stored in a weatherproofed shed well protected from the weather and dampness, the floor of which shad be raised at least 150mm above the ground to allow free air circulation, Cement delivered in bulk shall be stored in a weatherproof silo, All cement shall at all times be protected from deterioration or contamination j) Bagged cement shall not be stacked up more than 15 bags high in order to prevent hard lumps being formed k) Any damaged bags or bags in which there are hardened lumps or cakes of cement will be rejected and must be removed from the site by the Contractor l) The cement store shall be so arranged that batches of cement can be used in the order in which they were delivered m) Any cement which, upon inspection, is considered by the Construction Manager to have been in any way affected by dampness or hydration or otherwise unsuitable for use will be condemned without further tests and shall be removed from the site forthwith 2.2 SAND a) Sand shall be clean, hard, durable crushed It shall be thoroughly washed and all dirt, shells and others before use b) Manufactured sand is to be of a type suitable for general use in mortars and plasters, and to conform to the grading limits set out below c) Sand shall be free from any deleterious materials such as clay, flaky or elongated particles, mica, shale or other laminated materials, organic impurities, iron pyrites Sand shall not contain more than 1% of soluble sulfate salts In general, and except as specified herein, the sand is to comply with BS 1199 and 1200: 1976 d) Sand for mixed not incorporating lime shall be crushed granite or other durable rock fines or natural sand free from salt and shall conform to the grading limits set below: BS Sieve: 5.00mm 2.36mm Date:29.05.06 Percentage by weight passing BS Sieve: 100% 90 -100% Revision Tender Specifications - Section 01: Brickwork and blockwork - Page 5/16 Archetype Vietnam Ltd Saigon Pearl development project - phase 2a 1.18mm 0.60mm 0.30mm 0.15mm 70 -100% 40 - 80% - 40% - 10% e) Sand for mixes incorporating lime shall be clean natural sand free from salt and shall conform to the grading limits set below : BS Sieve: 2.36mm 1.18mm 0.60mm 0.30mm 0.15mm f) Percentage by weight passing BS Sieve: 100% 90 - 100% 55 - 100% - 50% - 10% Sand other than the 5.00mm size whose grading falls outside the limit set above by a total amount not exceeding 5% will be accepted g) The quantity of clay, fine silt and fine dust present when determined in accordance with BS 812-105.1: 1989, BS 812-105.2:1990, BS 812-103.1 or BS 812-106: 1985 must not exceed 10% by weight h) Where screeds, backing to tiles, rendering, plastering or other finishes are to be used externally, the use of sea sand washed or otherwise is strictly prohibited i) 2.3 Sand for facework mortar shall be from one source and of uniform color, different loads to be mixed if necessary LIME a) Lime used for mortar is to dehydrated lime or quicklime which complies with BS EN 4591:2001 free from lumps and is to be delivered to the site in sealed bags bearing the manufacturer’s name or brand The use of shell lime for mortar will not be permitted 2.4 LIME PUTTY b) Lime putty shall be prepared in accordance with BS 5492:1990 as follows: Add hydrated lime to BS EN 459-1: 2001 to water, mixed to putty with a thick, creamy consistency and left undisturbed for at east 16 hours before use, or Slaked quicklime Leave undisturbed for a minimum period of 36 hours for grey chalk lime, and weeks for white lime, before use 2.5 WHITE OR COLORED CEMENT a) White or colored cement is to be SNOWCRETE, COLORCRETE or other approved brand of similar quality and of the color required for the work It is to be delivered to the Site in sealed drums bearing the name of the manufacturer and the brand of cement b) Where the term “colored” is used, the meaning shall also include white color 2.6 WATER a) Water for finishing work shall be clean and uncontaminated potable water from Government main supply or any other approved source free from harmful matter b) If water is taken from a source other than Government main supply, it shall be tested in accordance with BS EN 1008:2002 when so required by the Construction Manager Date:29.05.06 Revision Tender Specifications - Section 01: Brickwork and blockwork - Page 6/16 Archetype Vietnam Ltd 2.7 Saigon Pearl development project - phase 2a ADDITIVES AND ADMIXTURES a) Do not use admixtures in mortar unless specified or approved in writing by the Construction Manager b) Do not use calcium chloride or any admixtures containing calcium chloride c) Plasticizers shall be an approved proprietary brand to BS EN 934-3: 2003 as recommended by the manufacturer d) Pigments for coloring mortar shall be an approved proprietary brand to BS EN 12878: 2005 2.8 MORTAR MIXES a) Mortar shall be mixed to the following proportions: Type of mortar Mix proportion Cement mortar Cement/lime mortar Cement/lime mortar (for use with solid vermiculite blocks) Firebrick mortar part cement to parts sand part cement to part lime putty and parts sand part cement to part lime putty and parts sand, or part cement to part lime to parts sand and parts Grade vermiculite An approved proprietary brand fire cement, used neat, or high alumina cement to BS 915-2: 1972 and fine crushed firebrick 1:2 Mix proportions given are for dry sand Allow for bulking if sand is damp b) Where mortars are required to be colored, the colored cement shall be used in lieu of Portland Cement in the proportions specified c) Where specified, the testing of mortar strength shall be to BS 5628-3 2.9 USE OF MORTAR a) Use cement mortar for the following: Work below damp proof course, including basement walls, 80mm brickwork, Concrete blockwork not exceeding 150mm, Load-bearing walls, Pointing where directed and where bedding is of cement mortar, Chimney stacks above roof level b) Use cement/lime mortar as specified in Mortar Mixes above for vermiculite blockwork c) Use firebrick mortar as specified in Mortar Mixes above for firebrick work d) Use cement/lime mortar as specified in Mortar Mixes above for brickwork and blockwork generally, except as specified above 2.10 BRICKS GENERALLY a) Bricks shall be even in size to the tolerance laid down in BS 3921: 1985, BS EN 772-3: 1998 and BS EN 772-7: 1998 b) Bricks with absorption of more than 20% by weight after immersion in water after for 24 hours will not be accepted c) Submit samples of each type of brick or block, and obtain approval from the Construction Manager before placing of orders Date:29.05.06 Revision Tender Specifications - Section 01: Brickwork and blockwork - Page 7/16 Archetype Vietnam Ltd Saigon Pearl development project - phase 2a 2.11 CLAY BRICKS a) Clay bricks shall be as follows : Hard, sound, well burnt, even and uniform in shape, clean and approved Free from cracks and other defects Equal to samples deposited with and approved by the Construction Manager Of nominal sizes: 180 x 80 x 80 mm unless otherwise specified 2.12 FACING BRICKS a) Bricks for fair faced walling not plastered or rendered shall be as follows: Of finest quality and specially “selected” Obtained from an approved manufacturer Picked for evenness, texture, sharpness of arises and uniformity of color 2.13 ENGINEERING BRICKS a) Engineering bricks and other load bearing bricks, shall be obtained from an approved manufacturer to BS 3921: 1985, Class A with an average crushing strength of 7MPa, or Class B with an average crushing strength of 5MPa, with absorption limit of 4.5% and 7% respectively 2.14 FIRE BRICKS a) Fire bricks shall be as follows: Imported fireclay refractory bricks of specified class to BS 4966:1991 of the best quality Light in color Uniform in texture Of standard sizes to BS 3056-1: 1985 Set in fire cement b) Fire cement shall be PYRUMA or approved equivalent c) Fire bricks shall be approved by the Construction Manager before use and tested to BS 1902, if required 2.15 CONCRETE BLOCKS a) Sizes of concrete blocks shall be one of the following: 400 x 140 x 180 mm high, or As specified in the working drawings b) Unless otherwise specified solid concrete blocks and hollow concrete blocks shall conform to BS 6073 Part and Part 2: 1981 or other approved manufacturers c) Crushing strength of concrete blocks shall be in full compliance with the requirements of Building Regulations in Vietnam The average crushing strength of a selected sample shall not be less than 7.0 MPa d) No concrete blocks shall be used which have not been allowed to cure for at least months from the date of manufacture 2.16 HOLLOW CLAY BLOCKS Not used Date:29.05.06 Revision Tender Specifications - Section 01: Brickwork and blockwork - Page 8/16 Archetype Vietnam Ltd Saigon Pearl development project - phase 2a 2.17 SOLID VERMICULITE BLOCKS Not used 2.18 WOODWOOL SLABS a) Woodwool slabs for partition shall be 75mm CELLOCRETE or other approved equivalent The slabs being dry and free from loose surface matter 2.19 GLASS BLOCKS a) Hollow glass blocks shall be of standard size 190 x 190 x 80mm thick (nominal) and shall be obtained from an approved manufacturer with the face pattern selected by the Construction Manager b) Nominal sizes of 150 x 150 x 80mm, 240 x 240 x 80mm, 150 x 150 x 100mm, 200 x 200 x 100mm and 300 x 300 x 100mm thick can be obtained from proprietary products Half and quarter blocks of standard size are also available on special order c) Hollow glass blocks, unless otherwise specified, shall be one of the following proprietary products: PC GLASS Block SOLARIS WECK GERRESHEIMERD Approved equivalent 2.20 LINTELS a) Unless otherwise show in the drawings, lintels shall be precast or cast-in-situ in Grade 20/20 concrete Dimensions and reinforcement shall be as follows,: Clear Span Section (mm) (depth x width) Bearing (mm) (at both ends) Reinforcement (nos and dia of bars each 105mm in width, or part thereof) Up to 1m 1.2m 2.3m 150 x wall width 225 x wall width 300 x wall width 150 225 225 no 12mm dia mild steel bar no 16mm dia mild steel bar no 20mm dia mild steel bar Note: Minimum concrete cover shall be 25mm between bar reinforcement and soffit 2.21 BLOCKWORK REINFORCEMENT a) Block work reinforcement shall be EXMET or other approved equivalent galvanized expanded steel mesh manufactured from 0.6mm thick steel sheet 2.22 DAMP PROOF COURSES a) Damp proof courses shall be one of the following: layers of fiber based bituminous felt to BS 6398: 1983, Table Class “B”, weighing approximately 3.3 kg/m2, or One layer of 0.46mm (minimum) thick polyethylene sheet to BS 6515: 1984 b) Use of Hessian based type of bitumen damp proof course shall not be permitted 2.23 WALL TIES a) Ties between ends of brick or block walls and concrete shall be one of the following: Date:29.05.06 Revision Tender Specifications - Section 01: Brickwork and blockwork - Page 9/16 Archetype Vietnam Ltd Saigon Pearl development project - phase 2a 6mm diameter steel rods 350mm long, painted with two (2) coats of black bitumenbased coating to BS 3416: 1991, 20 x 3mm galvanized mild steel flats 350mm long, fanged at both ends, Strips of approved blockwork reinforcement 350mm long, with 60mm width for 100 105mm thick walls and 110mm width for 200 - 225mm thick walls, fixed to concrete background by shot firing, Dovetailed slot ties with matching anchors Slots shall be 150mm long, stainless steel, anchor to be dovetail anchor as manufactured by approved manufacturer, or Other approved proprietary brands of wall ties b) Ties for brick or block walls built against face of concrete shall be Formed from 20 x 3mm galvanized mild steel flats 150mm long, fanged at both ends, or Dovetailed slot tiles with matching anchors c) Ties for cavity walls shall be 20 x 3mm vertical - twist type galvanized mild steel strip wall ties to BS EN 845-1: 2003 with length of at least 100mm longer than the specified width of the cavity, fanged at both ends d) Ties between stone walls and concrete or brickwork shall be stainless steel, copper or bronze flats 40 x 3mm thick, fanged at both ends and with the following lengths: 175mm (minimum) 350mm (minimum) - for stone walls built against face of concrete structure for stone walls built at junctions with concrete or brickwork WORKMANSHIP 3.1 MORTAR a) Mortar shall be mixed by mechanical mixer, Do not over mix mortar containing plasticizers In exceptional circumstances and where small quantities are required, approval may be given to hand mix mortar over a clean close boarded surface b) Keep plant and hanker boards clean at all times c) All constituents shall be as follows: Measured in gauge boxes made to sizes to suit volume required Mixed dry before adding water or lime putty, Mixed with minimum amount of water to provide the consistency required d) Use mortar within one hour of mixing at normal temperature Mortar which is not used within one hour after mixing shall be removed from site In no case shall mortar be used after initial set has commenced Reconstitution of mortar will not be permitted e) Plasticizers, when approved, shall be used in strict accordance with the manufacturers recommendations 3.2 LAYING OF BRICKS OR HOLLOW CLAY BLOCKS a) Bricks or hollow clay blocks shall be well wetted before laying b) Courses shall be kept leveled and kept vertically in line c) No one portion shall be raised more than 900mm above another at any one time d) Bonding shall be as follows: Stretcher bond Date:29.05.06 - for half-brick walls (100 or 105mm) and brick-on- edge walls (70 Revision Tender Specifications - Section 01: Brickwork and blockwork - Page 10/16 Archetype Vietnam Ltd Saigon Pearl development project - phase 2a English bond - or 75mm) for one-brick walls (225mm) and over, unless otherwise specified e) Joints shall be as follows: At a consistent thickness of 10mm Flushed up as the work proceeds f) 3.3 Finishing of joints in the following shall be: Plastered brickwork Fair-faced brickwork - Brickwork inside lift shaft - raked out to a depth of 13mm to provide key for plaster either a trowelled weathered joint as the work proceeds, or raked out to a depth of 10mm as the work proceeds and pointed with a weathered joint on completion raked out to a depth of 10mm and pointed and flushed with cement mortar LAYING OF SOLID CONCRETE BLOCKS a) Solid concrete blocks shall be laid dry in mortar b) Walls and partitions shall be laid in stretcher bond c) The bond shall be formed with purpose made half blocks and closers d) Perpends and quoins shall be truly kept e) Joints shall be flushed up as the work proceeds f) 3.4 Movement joints shall be provided in brickwork or blockwork for walls over 16 meters long or at the indicated locations, incorporated with metal tie rods at every second courses across the joints, packed with approved joint filler and pointed bath sides with approved silicone joint sealant LAYING OF HOLLOW CONCRETE BLOCKS FOR FLOOR OR ROOF SLABS a) Hollow concrete blocks shall be laid in straight rows with butt joints on formwork b) Hollow concrete blocks shall be sealed with similar concrete to a depth of 25mm at open ends where exposed c) Hollow concrete blocks shall be cured by standing in the open air for at least 28 days after casting and before placing in position 3.5 LAYING OF HOLLOW CONCRETE BLOCKS FOR WALLS a) Hollow concrete blocks for walls shall be laid with cavity downwards Do not fill hollows in hollow blocks Use cut or special shape blocks to make up courses and piece in, not use bricks or other materials 3.6 LAYING & JOINTING OF FACE WORK a) The term “facework” where used in this specification, applies to all brick or block walls which will be visible in the finished work, including fair faced work b) Select bricks/blocks with unchipped arises and flat square surfaces, Distribute bricks/blocks of varying color evenly throughout the work to avoid the appearance of patching Mix different deliveries which vary in color to avoid racking back marks, horizontal shading and the like Check each delivery for consistency of appearance with previous deliveries and Date:29.05.06 Revision Tender Specifications - Section 01: Brickwork and blockwork - Page 11/16 Archetype Vietnam Ltd Saigon Pearl development project - phase 2a not use where variation in color is excessive At jambs and junctions, cut brick/blocks only if necessary Cut with a masonry saw where cut edges will be visible c) Facework shall start not less than 150mm below finished level of external paving or soil except where shown otherwise set out and lay carefully to give a uniform appearance with joints to an even and regular appearance and with perpends aligned vertically in alternate courses d) Facing brick and blockwork shall be either jointed as work proceeds, or raked out and pointed with a flush, weathered or ribbon joint or other such joint finish as specified or approved by the Construction Manager e) Keep facework clean during construction and until practical completion Ensure that no mortar stains or sets on face of brickwork/blockwork Cover and protect at finish of day’s work and during rain, turn back scaffolding boards at night and during heavy rain to prevent splattering The use of abrasive techniques to remove mortar marks and stains will not be permitted 3.7 LAYING OF GLASS BLOCKS a) Sill, head and jambs of structural openings to receive glass block panels shall be painted with two coats of approved bitumen-based coating before laying of glass blocks b) Glass blocks shall be laid in cement I lime mortar consisting of one part Portland cement, part lime putty and parts clean sand by volume and pointed on both sides c) 12mm clearance joints shall be formed at top and sides of panels Clearance gaps shall be filled with approved polyethylene movement joint filler and sealer with an approved silicone joint sealant on both sides d) Unless otherwise specified, 65mm wide EXMET brickwork reinforcement expanded strips, manufactured from 0,5mm thick galvanized steel sheet, shall be built in horizontal joints of panel at every second course Ends of strips shall be carried across the clearance gap and built-in or secured to jambs of opening in an approved manner 3.8 BONDING OF WALLS AND PARTITIONS a) Division walls and partitions shall be properly bonded to main walls and provided with wall ties at every fourth course b) All perpends shall be strictly true and square c) No closers or bats shall be used except where necessary for bonding purpose d) Brick, concrete block or clay block partitions shall be toothed and bonded to main walls as required e) All brick and block walls shall be bonded to reinforced concrete walls and columns by approved wall tiles cast into the concrete at 320mm vertical centers and projecting 225mm from the concrete faces f) 3.9 For brickwork or blockwork built against face of concrete structure, cast in or cut and pin ties to concrete at 900mm centers horizontally and 320mm centers vertically and staggered, to project 75mm into brick or block walls BUILDING IN, CUTTING AND PINNING a) Shall be carried out in mortar, similar to that of adjacent walls Date:29.05.06 Revision Tender Specifications - Section 01: Brickwork and blockwork - Page 12/16 Archetype Vietnam Ltd Saigon Pearl development project - phase 2a b) The ends of the following articles shall be built-in, or cut and pinned in cement mortar and pointed as required: Thresholds, Steps, Lintels, Bearers, Brackets, etc 3.10 CHASES, HOLES, RECESSES, AND REVEALS IN WALLS ETC a) Shall be left, formed or cut to receive the following: Frames, Rainwater pipes or other pipes, Conduit, electric cables, etc., or As shown on working drawings b) Chases and holes, ,where permitted, shall be in approved locations Cut cleanly, without damage to the wail using suitable tools to the smallest practicable size c) Where door and window frames are to be built in, bed in mortar similar to that in adjacent work d) Cut and fit brickwork around steel work Carefully cut and fit faced brickwork next to stonework and other finishes and perform any other rough or fair cutting required 3.11 PINNING UP AND SEALANTS a) Pin up and wedge brickwork and blockwork to structural soffits, and fill solid with cement mortar provided always that the depth of such pinning does not exceed 25mm b) Where the depth of the pinning exceed 25mm, the pinning up shall be carried out with purpose-made precast cement tiles of approved pattern and of the required thickness bedded solidly in cement mortar c) For block or brick walls 114mm thick and in excess of 3,6m high and for block and brick walls 230mm thick in excess of 4.9m high, the top of the wall shall be bonded to the stab with 6mm steel rods as described in “Workmanship / Bonding of Walls and Partitions” above d) When detailed on the drawings or specified, brickwork and blockwork shall have expanded polystyrene foam separation strip between the top of the wall and the concrete soffit over Apply sealants to manufacturers recommendations of matching color with the wall finishes and finish neatly to an approved profile Keep adjacent surfaces clean 3.12 BEDDING AND POINTING FRAMES a) Holdfasts for timber door frames, etc or door sub-frames, shall be built in as work proceeds Door frames etc shall be installed after brick-work and rough finishing is completed, securely fixed to hold fasts or sub-frames, and pointed solid in cement mortar one or both sides as required 3.13 BRICK / BLOCK REINFORCEMENT a) The Contractor shall include reinforcement in the brickwork / blockwork Brick / block reinforcement shall conform with BS 405 and be made from galvanized steel reinforcement strip mesh not less than 0.5 mm thick and shall be well lapped at angles and passing Brick / block reinforcement shall be laid on an even bed of mortar in a continuous strip with 225 mm laps at joints and full laps at angles Keep back 20 mm from face of external work, 12 Date:29.05.06 Revision Tender Specifications - Section 01: Brickwork and blockwork - Page 13/16 Archetype Vietnam Ltd Saigon Pearl development project - phase 2a mm back from face of internal work and finish mortar joint to normal thickness Lay on layers at not more than 1200 mm centers vertically 3.14 RESTRAINTS AND TIES TO STRUCTURAL ELEMENTS a) All external and internal wall panels shall be tied to concrete columns, load bearing wall or posts with fishtail anchors in the dovetail slots cast in the concrete External walls shall be tied to concrete columns, load bearing wall or posts by galvanized steel ties The anchors or ties shall be provided every third course to external walls and every sixth course to internal walls b) All internal walls shall be tied to the concrete columns, load bearing wall or posts with galvanized steel ties built into the wall every sixth course c) All internal walls shall be restrained on the top with Galvanized mild steel angles d) Galvanized dovetailed masonry slots and anchors and Galvanized steel straps for internal walls shall be provided at 1200mm centers or as otherwise shown on the drawings 3.15 TYPICAL STEEL STIFFENERS SCHEDULE FOR BRICK / BLOCK WALL PARTITION a) For all brick walls to be constructed, appropriate steel stiffeners / reinforcements are to be incorporated as per the following schedule For wall thicknesses not shown in the following schedule, additional requirements shall be followed and subject to Shop-drawings / structural calculations to be submitted for Construction Manager comments / approval before execution on site Wall thickness H (m) Wall full height H (m) Height between horizontal stiffeners L (m) Width between vertical steel stiffeners 100 3-6 10 - 12 10 ≤8 10 - 12 10 150 - 12 10 175 - 12 15 200 - 12 20 125 Steel stiffeners Vertical: Horizontal: Vertical: Horizontal: Vertical: Horizontal: Vertical: Horizontal: Vertical: Horizontal: Vertical: Horizontal: Vertical: Horizontal: 102 x 51 channel 102 x 51 channel TWIN 102 x 51 channel 102 x 51 channel 127 x 64 channel 127 x 64 channel TWIN 127 x 64 channel 127 x 64 channel 152 x 152 x 30 UC 152 x 76 channel 152 x 152 x 37 UC 178 x 76 channel 203 x 203 x 46 UC 203 x 76 channel b) For steel reinforcement for concrete hollow blocks, refer to drawing No P2A/S-007 3.16 DAMP PROOF COURSE a) Flush up brickwork to an even bed using mortar as in the brick wall below, to receive horizontal damp proof course b) Damp proof courses shall be provided in brickwork or blockwork at a height of not less than 150mm above the highest level of the external ground or paving The damp proof course shall be stepped where necessary to maintain its relative position above ground level or where indicated on the drawings and shall so in even steps and be continuous Date:29.05.06 Revision Tender Specifications - Section 01: Brickwork and blockwork - Page 14/16 Archetype Vietnam Ltd Saigon Pearl development project - phase 2a c) Lay damp proof course over the full thickness of the walls in continuous strip with 150mm laps at ends of lengths and full laps at angles, and complete mortar joint to normal thickness 3.17 EXPANSION AND CONTRACTION JOINTS IN BRICK OR BLOCK WALLS ETC a) Where shown on the drawings or required, expansion joints shall be formed in brickwork or blockwork by building in a strip of 12mm thick polystyrene foam or FLEXCELL boarding b) The joint shall continue through the finish, and shall be covered by an expansion joint cover specified elsewhere 3.18 FIXING TO VERMICULITE BLOCK PARTITIONS a) No heavy loads may be supported on the vermiculite block partitions b) Where secure fixings are required to the partitions, special blocks made to a higher density should be inserted as the work proceeds c) Wherever possible, loads should be well distributed over several fixings 3.19 RAKING OUT AND POINTING FLASHINGS, ETC a) Rake out joint to a depth of 25mm for turn-in of metal flashings or bituminous felt skirtings b) Rake out and enlarge joint to 25 x 25mm for turn-in of asphalt skirting c) Point metal flashings in mortar similar to that in adjacent work 3.20 MASTIC POINTING a) All external joints between door frames, window frames etc and adjoining brickwork, blockwork or plasterwork shall be pointed in SECOMASTIC or approved equivalent, using a pressure gun designed for the purpose 3.21 TOLERANCES a) Brickwork and blockwork shall be built to the following tolerances: Position on plan Length Height Level of bed joints (in any 5m) Straightness (in any 5m) Verticality (in any 3m) ± 15mm ± 15mm ± 10mm ± 10mm ± 15mm ± 15mm 3.22 DRY WEATHER a) During dry weather, wet bricks and blocks the minimum necessary to prevent premature drying out of the mortar 3.23 WET WEATHER a) During wet weather, protect freshly laid brickwork or blockwork during interruptions due to rain, and at the completion of each day’s work 3.24 HANDLING & STORAGE a) Where bricks are delivered to site, they shall be unloaded by hand and neatly stacked without soiling, chipping or other damages Date:29.05.06 Revision Tender Specifications - Section 01: Brickwork and blockwork - Page 15/16 Archetype Vietnam Ltd Saigon Pearl development project - phase 2a b) Stack bricks clear of the ground on an even surface and protect from rain contamination or other damage c) Once received on site, concrete and vermiculite blocks shall be kept dry and protected from 3.25 PROTECTION AND CLEANING UP a) Plug up all drainage outlets before laying brickwork or blockwork and remove all plugs after completion b) Protect and cover freshly laid brickwork or blockwork at end of each day’s work c) Clean up the floor of mortar droppings immediately after each days work — END OF SECTION — Date:29.05.06 Revision Tender Specifications - Section 01: Brickwork and blockwork - Page 16/16