08 ok CW2C DRAINAGE AND OTHER WORK ITEMS

CMDRCP / CW2C PACKAGE CW2C KM 18+200 – KM 23+450 DRAINAGE AND OTHER WORK ITEMS 1/ 12 PHUONG THANH - QUYET TIEN - ANH GIANG – THANG LOI JOINT VENTURE CMDRCP / CW2C PACKAGE CW2C KM 18+200 – KM 23+450 TABLE OF CONTENTS I BOX CULVERTS II DITCHES III CATCH BASINS, MANHOLES, INLETS, AND OUTLET IV MORTARED STONEWORK V PAVEMENT MARKINGS 2/ 12 PHUONG THANH - QUYET TIEN - ANH GIANG – THANG LOI JOINT VENTURE CMDRCP / CW2C PACKAGE CW2C KM 18+200 – KM 23+450 All materials must be in conformity with the Specifications I BOX CULVERTS MATERIAL REQUIREMENTS Box culverts shall be cast in situ and in accordance with details as shown in the Drawings The Contractor shall submit, for the Engineer’s approval, arrangement for the construction of Reinforced Concrete Box Culverts Unless otherwise directed by the Engineer, applicable provisions of Division - Structural Works shall be read into and become part of this Clause Waterstops shall be heat-weldable ribbed PVC with centerbulb Unless otherwise shown on the Drawings, waterstops shall have minimum weight 1.0 kg / meter, elongation at break at least 250%, and tensile strength at least 12 MPa EXCAVATION Prior to starting excavation the Contractor shall take all necessary measures to keep the excavation free from free-surface water or surface water from pre-loading and soft soil treatment Except as otherwise instructed by the Engineer, in areas of fill, filling, pre-loading and soft soil treatment shall be completed and the surcharge embankment reach a stable condition, before excavation begins, subject to the approval of the Engineer All excavation shall be carried out so as to minimize damage to existing surfaces Soft spots in the bottom of box culvert excavation shall be removed and the resulting void immediately backfilled with Granular Backfill When the Engineer instructs this additional treatment it will be paid for under the relevant clauses of these Specifications Where the Engineer considers that soft spots are due to the Contractor’s failure to fulfil his obligations under any clause of these Specifications then the Contractor shall, at his own expense, undertake the additional excavation and replacement with Granular Backfill to the satisfaction of the Engineer Any suitable material below the level of the box culvert bed which is removed unnecessarily shall be replaced at the Contractor’s expense with Granular Backfill BEDDING FINISHING Excavation shall be executed to the true line and level directed by the Engineer Where indicatd on the Drawings bedding shall be installed or foundation treatment carried out BACKFILLING AND REINSTATEMENT Backfilling shall not commence until in the opinion of the Engineer, the concrete has achieved sufficient strength Backfilling shall be carried out in accordance with the requirements of Section 03200, except that the material used for backfill around and above the box culvert for a minimum distance of 50 cm shall be sand in place of excavated material Where insufficient suitable material is available, surplus material from any other excavation shall be used On 3/ 12 PHUONG THANH - QUYET TIEN - ANH GIANG – THANG LOI JOINT VENTURE CMDRCP / CW2C PACKAGE CW2C KM 18+200 – KM 23+450 completion of backfilling, the area excavated shall be reinstated to its original condition but the Engineer may waive or modify this requirement if the area is to be overlaid or reconstructed under other clauses of this Contract 4/ 12 PHUONG THANH - QUYET TIEN - ANH GIANG – THANG LOI JOINT VENTURE CMDRCP / CW2C PACKAGE CW2C KM 18+200 – KM 23+450 II DITCHES MATERIAL REQUIREMENTS MATERIALS The Contractor shall submit to the Engineer for his approval details and samples of materials he intends to use for the construction of ditches included in this specification section BEDDING Granular material for bedding shall be in accordance with clause 4.2, table of TCVN 7570 – 2006 subject to the approval of the Engineer Lean concrete for bedding shall be class C10 bedding or blinding concrete in accordance with the requirements of Specification Section 07100 “Concrete and Concrete Structures” MORTARED STONE Mortared stone lining shall conform to the requirements specified in Specification Section 04400 “Mortared Stonework” CONCRETE Pre-cast and cast in situ concrete used for all structural work described in this Specification Section shall be of the classes indicated on the drawings and shall conform to the requirements specified in Specification Section 07100 “Concrete and Concrete Structures” REINFORCING STEEL FOR CONCRETE All reinforcing steel used in the works shall conform to the requirements specified in Specification Section 07500 “Reinforcing Steel” ROADSIDE DITCHES CONSTRUCTION The Contractor shall excavate, fill, and shape the ditches to the grades shown on the construction drawings and to the profiles shown on the typical drawings of ditches or as otherwise directed by the Engineer For open ditches lined with mortared stone the Contractor shall remove and dispose of all excavation material For cast in-situ concrete ditches excavation shall be in accordance with the provisions of Specification Section 03200 “Structural Excavation” No material shall be left on site such that it may be washed or otherwise deposited back into the excavation or the completed ditches Construction of the cast in-situ concrete or the stone lining for ditches as specified in this Specification Section shall not begin until after the Engineer approves the excavated formations for the ditches The finish to all ditches shall be sufficiently smooth and uniform to ensure the free flow of water without ponding during periods of low flow TOLERANCES, RECTIFYING AND MAINTENANCE 5/ 12 PHUONG THANH - QUYET TIEN - ANH GIANG – THANG LOI JOINT VENTURE CMDRCP / CW2C PACKAGE CW2C KM 18+200 – KM 23+450 DIMENSIONAL TOLERANCES Grades of ditch inverts against those specified or approved: ±5 mm at any point Ditches alignments and the shape of cross sections as specified in the Drawings: ±2 cm at any point RECTIFYING UNSATISFACTORY WORK All materials and workmanship used in the construction of culverts shall be subject to the inspection and approval of the Engineer Where appropriate the Engineer will issue instructions for any remedial work found necessary as a result of unsatisfactory work by the Contractor The Works will not be approved until such time as they have been completed to the satisfaction of the Engineer Remedial work may include but not be limited to:  Repetition of survey work defining existing or constructed surface profiles as often as necessary to obtain an accurate record of the physical conditions;  Additional excavation or fill, which could include backfilling new work and re-excavating it to the specified dimensions, lines, and grades, and  repairing or replacing defective mortared stonework or concrete work No additional payment shall be made for the extra work or quantities used for the rectification III CATCH BASINS, MANHOLES, INLETS, AND OUTLETS MATERIAL REQUIREMENTS MATERIALS The Contractor shall submit to the Engineer for his approval details and samples of materials he intends to use for the construction of Catch Basins, Manholes, Inlets and Outlets to culverts and ditches included in this specification section BEDDING Fine sand fill/bedding shall be black sand (river sand) The sand shall be a fine sand complying with the requirements of Table of TCVN 7570-06 with a fineness modulus of 0.7 to 2.0 Organic and other impurities shall be in accordance with table of TCVN 757006 as follows:  Clay and balled impurities shall be less than or equal to 0.5%  Muds and dirt shall be less than or equal to 10% It will not be necessary to determine the alkali reactivity or the chloride content of the sand for this use Sand shall be sampled and tested in accordance with TCVN 7572:2006 (Aggregates for concrete and mortar – Test methods) Granular material for bedding shall be in accordance with clause 4.2, table of TCVN 7570 6/ 12 PHUONG THANH - QUYET TIEN - ANH GIANG – THANG LOI JOINT VENTURE CMDRCP / CW2C PACKAGE CW2C KM 18+200 – KM 23+450 – 2006 subject to the approval of the Engineer Lean concrete for bedding shall be class C10 bedding or blinding concrete in accordance with the requirements of Specification Section 07100 “Concrete and Concrete Structures” CONCRETE Pre-cast and cast in situ concrete used for all structural work described in this Specification Section shall be of the classes indicated on the drawings and shall conform to the requirements specified in Specification Section 07100 “Concrete and Concrete Structures” REINFORCING STEEL FOR CONCRETE All reinforcing steel used in the works shall conform to the requirements specified in Specification Section 07500 “Reinforcing Steel” MORTARED STONE Mortared stonework shall conform to the requirements specified in Specification Section 04400 “Mortared Stonework” STEELWORK Steelwork items shall comply with the requirements of 22TCN288:2002 and shall be galvanised in accordance with AASHTO M232 MORTAR Mortar for joints or other works shall only be used if required by the Engineer, or so indicated on the Drawings If or when required mortar shall comply with specification section 08100 “Cement Mortar” SITE PREPARATION The Contractor shall carry out any excavation that may be required for Catch Basins, Manholes, Inlets and Outlets in accordance with the provisions of Specification Section 03200 “Structural Excavation” The Contractor shall be responsible for all dewatering and temporary support works for the excavations and all other necessary temporary works that may be required during construction DELIVERY, STORAGE AND HANDLING Materials delivered to site shall be inspected for damage, unloaded, and stored with minimum handling Any damaged materials shall be rejected and replaced at the Contractor’s expense CONNECTIONS Culvert pipes or ditch sections shall be placed or cast and properly bedded before being cast into or built into catch basins, manholes or inlet and outlet structures MANHOLE COVERS, CATCH BASINS AND FRAMES 7/ 12 PHUONG THANH - QUYET TIEN - ANH GIANG – THANG LOI JOINT VENTURE CMDRCP / CW2C PACKAGE CW2C KM 18+200 – KM 23+450 Covers to manholes and catch basins shall be fabricated, supplied and installed complete with steel frames and lifting points as indicated on the drawings IV MORTARED STONEWORK REFERENCE STANDARDS Mortared stonework shall comply with the requirements of standard TCVN 4085:2011 Structure of stone brick – Regulations on Construction and Acceptance STONE Stones shall consist of field stone or quarry stone They shall be sound, tough, durable, dense, resistant to the action of air and water, and suitable in all respects for the purpose intended Mortared Stonework: Unless otherwise indicated on the Drawings or directed by the Engineer, the stone shall meet the gradation requirements shown in Table The Quality and dimensions of the stones shall be approved by the Engineer prior to their use Stones shall be as nearly rectangular in shape as practicable Approximate Given Size Equivalent Cubic Dimension (mm) Total Size Smaller than Given Size (%) Weight (kg) Volume (cu.m.) 45 0.018 250 100 27 0.011 225 80 11 0.005 165 50 0.0003 75 10* * Material shall consist of spills and rock fragments graded to provide a stable compact mass CEMENT MORTAR Cement Mortar shall be in accordance with the provisions of Specification Section 08100 “Cement Mortar” or as directed by the Engineer WORK PREPARATION PREPARING FORMATIONS OR FOUNDATIONS 8/ 12 PHUONG THANH - QUYET TIEN - ANH GIANG – THANG LOI JOINT VENTURE CMDRCP / CW2C PACKAGE CW2C KM 18+200 – KM 23+450 The Contractor shall prepare formations for mortared stonework to the lining of open ditches in accordance with the provisions of Specification Section 04200 “Ditches” The Contractor shall prepare foundations and trenches for cut-of walls or other structures made of mortared stonework in accordance with the provisions of Specification Section 03200 “Structure Excavation” PREPARING STONE The Contractor shall clean the stones of all defects that may impair the bond with the mortar The Contractor shall thoroughly wet the stones long enough for the stones to absorb water to near saturation prior to laying PLACING STONE LINING Surfaces to receive mortar shall be cleaned of oil or clay or other contaminants and thoroughly saturated before the mortar is applied Free surface water shall be removed before application of the mortar The Contractor shall place a bedding of fresh mortar at least cm thick on the prepared formation The Contractor shall construct this mortar bedding progressively by laying the surface stones in such a manner that the stones are always securely bedded in the mortar before it hardens The Contractor shall place the stones firmly against each other to provide the required paving thickness measured perpendicular to the slope The Contractor shall then place additional mortar to completely fill all spaces between the stones The finished surface of the mortar shall be almost flush with the surface of the lining but the mortar shall not cover the stones The work shall progress from the bottom of the slopes towards the top The Contractor shall finish the surface immediately following the initial set of the mortar by sweeping the surface with a stif broom The Contractor shall cure the finished surfaces as specified for concrete work in Specification Section 07100 “Concrete and Concrete Structures” The Contractor ensure a tight The interfaces at the edges of shall trim and finish adjacent slopes and shoulders to and smooth interface with the mortared stonework shall allow unobstructed drainage and prevent scour the work CONSTRUCTING MORTARED STONEWORK STRUCTURES The Contractor shall construct mortared stonework structures by covering the base of the foundation with mortar to a depth of 60% of the maximum dimension of the stones The Contractor shall then immediately place the stones in the unset mortar The Contractor shall add additional mortar and repeat the process until the structure is complete The Contractor shall then add mortar to the top of the cutof until he obtains a screened level top surface 9/ 12 PHUONG THANH - QUYET TIEN - ANH GIANG – THANG LOI JOINT VENTURE CMDRCP / CW2C PACKAGE CW2C KM 18+200 – KM 23+450 The Contractor may construct mortared stonework without forms if the stone can interlock sufficiently and if he uses stif mortar The Contractor shall finish and cure exposed surfaces of mortared stonework structures as specified in Specification Section 07100 “Concrete and Concrete Structures” The Contractor shall backfill around the finished and cured mortared stonework in accordance with the provisions of Specification Section 03200 “Structure Excavation” V PAVEMENT MARKINGS REFERENCE STANDARDS The following Standards in their latest edition shall be particularly applied to the works covered by this Specification  QCVN 41:2012/BGTVT National Technical Regulation on Road Signs and Signals  TCVN 8786:2011 Traffic Paints Road Marking Materials: Water based paints Specification and Test Method  TCVN 8787:2011 Solvent based Traffic Paints Road Marking Materials: paints Specification and Test Method  TCVN 8788-2011 Technical Traffic Paints Road Marking Materials - requirements and test methods  TCVN 8791-2011 Traffic Paints Thermoplastic pavement markings - Road markings, construction and acceptance  AASHTO M247-05 Glass Beads Used in Traffic Paints  AASHTO M248-03 Paints Ready-Mixed White and Yellow Traffic  AASHTO M249-03 White and Yellow Reflective Thermoplastic Stripping Material (Solid Form) PREPARATION OF ROAD SURFACE The work of road marking shall include the following: a) Cleaning of the pavement surfaces to remove all dust, dirt, grease, oil and other foreign matter b) Application, protection and drying of paint coatings c) Protection of pedestrians, vehicular or other traffic d) Protection of all parts of the road structure and its appurtenances against disfigurement by spatters splashes or smirches of marking material e) Supply of all tools, labour and marking materials necessary 10/ 12 PHUONG THANH - QUYET TIEN - ANH GIANG – THANG LOI JOINT VENTURE CMDRCP / CW2C PACKAGE CW2C KM 18+200 – KM 23+450 for the entire work Thermoplastic shall not be applied during rain or wet weather or when air is misty, or when in the opinion of the Engineer, conditions are unfavourable for the work Thermoplastic shall not be applied on damp pavement surfaces, or on pavement which has absorbed heat sufficient to inhibit the thermoplastic from setting properly APPLICATION OF THERMOPLASTIC MATERIAL Thermoplastic shall not be placed on a sealed surface sooner than three (3) days after application of the final seal coat or Asphaltic Concrete surfacing The precise dimensions and positions of all pavement markings shall be set out and marked on the pavement before the thermoplastic is applied The thermoplastic material shall be melted in a heater fitted with a mechanical stirrer to give a smooth consistency to the material and to avoid local overheating The temperature of the mass shall be maintained within the range specified by the manufacturer Road markings shall be carried out by suitable machines and equipment approved by the Consultant Hot plastic materials shall be thermal painted by glazing, pressing and spraying methods Materials that are already put in spreading machine must be maintained at a temperature stipulated by manufacturer for specific spreading methods For road marking by machine, only one layer of painting with thickness of more than 2.5mm shall be placed Before being used for a designated works, road marking machines must be tested at a suitable location outside the work site Calibration of the machine/equipment shall be carried out in the next test Only when it is properly calibrated and approved by the Consultant will the equipment be used for the designated works Capable and experienced workers shall be assigned to operate the road marking machines Number of machines shall be considered and properly adjusted, if necessary, before putting into operation in a large-scale work site Daily checking and adjustment is also necessary throughout the work For locations or markings which are awkward to by machine, approved manual methods may be used with the prior approval of the Engineer Thermoplastic shall be applied in a uniform thickness of at least 2.5mm (exclusive of the glass beads applied to the surface) unless otherwise specified Type II glass beads shall be applied uniformly to the surface of the marking whilst it is still molten The glass beads shall be applied by pressure or spray application at a rate of 450 gm/m2 The markings shall not deviate from the specified dimensions by more than 20mm The edges shall be smooth and distinct 11/ 12 PHUONG THANH - QUYET TIEN - ANH GIANG – THANG LOI JOINT VENTURE CMDRCP / CW2C PACKAGE CW2C KM 18+200 – KM 23+450 The upper surface of the markings shall be level, uniform and free from streaks The surface must not be slippery when wet All markings shall be protected from traffic until the markings have hardened sufficiently so that there is neither pick-up of the material on tyres nor any imprint of tyre marks The markings shall show no appreciable deformation, discoloration, cracking, lifting or peeling under traffic and under road temperatures up to 60°C 12/ 12 PHUONG THANH - QUYET TIEN - ANH GIANG – THANG LOI JOINT VENTURE ... include backfilling new work and re-excavating it to the specified dimensions, lines, and grades, and  repairing or replacing defective mortared stonework or concrete work No additional payment... fill/bedding shall be black sand (river sand) The sand shall be a fine sand complying with the requirements of Table of TCVN 7570-06 with a fineness modulus of 0.7 to 2.0 Organic and other impurities shall... Mortared stonework shall conform to the requirements specified in Specification Section 04400 “Mortared Stonework” STEELWORK Steelwork items shall comply with the requirements of 22TCN288:2002 and shall