Cấp phối đá dăm_ Tiếng Anh

Group 1: Vũ Tuấn Tú Lưu Quang Vũ Phạm Văn Minh Đỗ Phương Nam Lê Ngọc Linh Nguyễn Ngọc Trịnh Nguyễn Thị Phương Anh Nguyễn Thị Phương Linh Lê Trung Chất 10 Nguyễn Văn Cương Construction and acceptance stabilized aggregate base course procedures General rules Inspection, Technical acceptance requirements Construction technology General rules 1.1 Field of application 1.1.1 This Regulation stipulates the technical requirements for materials, technical and laboratory equipment used in the wet cleaning process Type of filling (CPDD) 1.1.2 Slabs of low-level material are as follows: the level of beeswax, the dressing, the breasts, the breasts and the breeds and the breeds that have been bred by high quality not subject to the provisions of this Regulation 1.1.3 This procedure replaces the "Criteria for the manufacture and assembly of rubber sheets in accordance with the method of installation" 22 TCN 25298 1.2 Definitions and terminology 1.2.1 Graded Aggregate is a mixture of granular rock material with granular composition that complies with the principle of continuous grading, The symbol is CPDD 1.2.2 CPDD using a network is divided into two types: CPDD type I and type II CPDD type I: is the level of coverage of all probable cases - estimated from the statute Declare CPDD type II: is a sealant that is applied from the opening or bottom of the sheet, where it is less than 2.36 mm in thickness, which may be a naked prison void The liquids not absorb 50% of the CPDD When CPDD is estimated to be 9.5 mm in diameter, it is estimated that 75% of the total surface area is covered by two planes because it is large CPDD type I CPDD type II 1.3 Scope of using different types of central offices 1.3.1 CPDD type I: is used as the upper (and lower foundation on the basis of technical and economic considerations) of soft pavement structure with surface layer A1 or A2 according to 22TCN 211-06 The upper foundation under 22TCN 274-01 1.3.2 CPDD type II: shall be used as the substructure of the pavement structure with A1 surface layer and as the foundation for A2 or B1 surface layer 22TCN 211-06 or under foundation 22TCN 274-01 Technical requirements for Graded Aggregate 2.1 Constituent of Joint Stock Company 2.1.1 The composition of GA is stipulated in Table Tab Component seed of aggregate macadam Size screening surface Proportion percentage % by weight   D = square (mm) max 100   37,5 25 - 9,5 4,75 0,425 0,075   - 64 25 - 40   12 - 24   13 - 27   - 12     30 - 45       39 - 59       58 - 73   34 - 54 2- 12   90 - 100   49 7- 19   - 100 - 83           15 - 30     - 90 24 - 39 2,36               67 39 - 59   100     max = 19 mm   79     D     58 - 78     -         19           max = 25 mm 95- 100     D 37,5 mm 50       - 12     2.1.2 The distribution of the common stock (according to the most common name of Dmax) shall be based on the coding of the design and shall be included only in the application form and the technical specifications of the works: A Dmax = 37.5 mm rated for dip galvanized; B Dmax = 25 mm grade suitable for the above layer; C Dmax = 19 mm, suitable for both sides and up to the height of the joints in the substrate 2.2 Indications of management of the contents of this packet Indicators of essential ingredients of CPDD are specified in Table Tab Targets Physico-mechanical require of material CPDD   aggregate macadam Method     TT Target technology                 Lo¹i I     Lo¹i II     experiment       Wear and tear Los-Angeles of aggregate           (LA), %   Index Load capacity CBR in tightness     ≤ 35   ≤ 40   22 TCN 318-04     No   ≥ 100     22 TCN 332-06     K98, drench 96 hours , %   Limit run (WL), %   ≤ 25 ≤ 35 AASHTO T89-02 (*)     index plastic (IP), %   ≤6 ≤6 AASHTO T90-02 (*)     index PP = index plastic IP ≤ 45 ≤ 60       X % measure       come through screen 0,075 mm     content bead Flat, %       ≤ 15   tightness Compaction (Kyc), %      Ghi chó:             ≤ 15 ≥ 98           regulations TCVN 1772-87(**)   22 TCN 333-06   ≥ 98               ( Method II-D)   (*)       Limit run, limit flastic determined by experiment with grain compotision passes through the sieve   0,425 mm             (**)     seed rhombus is seed is depth or width less than or equal 1/3 long ;     Experiments were conducted with particle sizes larger than 4.75 mm                                           *Contact Reality - Advantage: + intensity pretty high Eđh = 2000 - 3000 daN/ cm2 + Equivalent Stable water + price reasonable - Disadvantage: + Horizontal thrust cream + request High material demand produce in enterprise with chain technology modern Should be High price + easy to abrasive below action of load wheel should be Dust generation when sky dry onion, it rains component binder soil, badigeon undergo wash make rock undergo burst out create to pot hole make pavement tenuity flat + coefficient cling Between wheel androad surface small + intension Much reduced when damp (Special is aggregate macadam Type ) Construction technology subbase canal by aggregate macadam - Regularly check the gravity moisture before spreading the stone - Only sprayed by a stone paving machine if approved by the supervision consultant, the foundation can be spread by a leveling machine Soviet system sprayed right Kr=1.3 - Make sure the thickness , flatness , horizontal slope design - The thickness of each layer must be leveled not more than 18cm for the foundation and 15cm for the upper one and the thickness of each layer shall not be less than three times the maximum particle size - in order to ensure leveling on the entire width of the foundation - If the width of the pavement is large use scattered dirt - Using multiple spreaders simultaneously, the machine must be spaced 10-20m apart - Using a spreading machine to spread , spread enough width should proceed immeditaely - Between patches the joints must be treated - It is necessary to regularly check the elevation , flatness , horizontal slope , vertical slope humidity and harmonics of the macadam material during the spreading process - If a stratified mixture is to be found , replace it with a good one -It is necessary to leave 5% of grading to offset later c Leveling work: *Request: - If the thickness is greater than that , it must be divided into layer, if spread and continue to level the layer immediately , sequence and technology as the lower layer - Prior to leveling , the pilot must be leveled L ≥ 50m * The stage: - Preliminary leveling : use static roller 6T-8T, roller 3-4 weekly/point, speed 2-3km/h Immediately after the preliminary flattening stage should immediately carry out the inspection of the horizontal slope , flatness and detect the convexity of the concave , stratified to timely repair +If there are unusual phenomena such as cracks , ripples , buckets or discrete not tight to stop immediately to find the cause and radical and then to next All of these tasks must be completed before reaching 80% of the stage +If the filler has to be filler after the foundation has been completed , the surface of the nail bed must be plowed with a depth of a least 5cm before offsettings - Flat leveling using 8-10T or 14T vibratory roller, roller 8-10 times/point, speed 2-4km/h Then use flat tire roller 10-25 times/point, load wheel >1.5T , speed 2-4km/h - Complete flat finishing using 8-10T static steel rollers , leveling 3-4times/point, speed 2-4km/h - When lu must reward through wet sand dirt smooth