|
|
||||||||||||
CJJ/T 135-2009 PDF EnglishSearch result: CJJ/T 135-2009_English: PDF (CJJ/T135-2009)
CJJ/T135-2009 (CJJT135-2009): PDF in EnglishCJJ/T 135-2009 UDC CJJ INDUSTRY STANDARD OF THE PEOPLE’S REPUBLIC OF CHINA Record number J965-2009 Technical specification for pervious cement concrete pavement [2023 Edition] ISSUED ON: NOVEMBER 16, 2009 IMPLEMENTED ON: JULY 01, 2010 Issued by: Ministry of Housing and Urban-Rural Development of the People’s Republic of China. Table of Contents 1 General provisions ... 6 2 Terms and symbols ... 7 2.1 Terms ... 7 2.2 Symbols ... 7 3 Materials ... 9 3.1 Raw materials ... 9 3.2 Pervious cement concrete ... 10 3.3 Pervious cement concrete mix proportions ... 10 4 Structural combination and tectonic ... 14 4.1 Structural combination design ... 14 4.2 Surface design ... 16 4.3 Drainage system design ... 16 5 Construction ... 18 5.1 General requirements ... 18 5.2 Mixing and transport ... 18 5.3 Pervious cement concrete pavement paving ... 19 5.4 Joint construction ... 21 5.5 Curing ... 21 5.6 Seasonal construction... 21 6 Acceptance ... 23 6.1 General requirements ... 23 6.2 Quality test standards ... 24 7 Maintenance ... 28 Appendix A Test method of permeability coefficient ... 29 Explanation of wording in this Specification ... 32 Normative standards ... 33 1 General provisions ... 36 2 Terms and symbols ... 36 3 Materials ... 37 4 Structural combination and tectonic ... 40 5 Construction ... 46 6 Acceptance ... 50 7 Maintenance ... 51 Appendix A Test method of permeability coefficient ... 52 Appendix B Test method for continuous void ... 53 Normative standards ... 55 Technical specification for pervious cement concrete pavement 1 General provisions 1.0.1 This Specification is formulated in order to enhance the quality of pervious cement concrete pavement projects and make them technologically advanced, economical, reasonable, convenient and applicable. 1.0.2 This Specification applies to the design, construction, acceptance and maintenance of pervious cement concrete pavements such as newly built urban light load roads, light load roads in gardens, squares and parking lots. This Specification does not apply to pavements in severe cold areas, collapsible loess areas, saline soil areas, and expansive soil areas. 1.0.3 The structural form of pervious cement concrete pavement shall take into account geological conditions, load levels, landscape requirements, environmental conditions, construction conditions and other factors. 1.0.4 This Specification specifies the basic technical requirements for the design, construction, acceptance and maintenance of pervious cement concrete pavement. Where this Specification conflicts with the provisions of national laws and administrative regulations, the provisions of national laws and administrative regulations shall prevail. 1.0.5 The design, construction, acceptance and maintenance of pervious cement concrete pavement shall not only comply with the provisions of this Specification, but also comply with the provisions of the relevant current national standards. 2 Terms and symbols 2.1 Terms 2.1.1 Pervious cement concrete Concrete, with a continuous void structure, which is formed by mixing coarse aggregate and cement-based binder. 2.1.2 Continuous void The percentage of the volume of continuous void existing inside pervious cement concrete to the volume of pervious cement concrete. 2.1.3 Water-washing pervious cement concrete Pervious cement concrete whose coarse aggregate on the surface is exposed after the cement-based binder wrapped on the surface of the coarse aggregate is water-washed before final setting. 2.1.4 Reinforcer An additive used to improve the bonding performance of coarse aggregate and binder and increase the strength of pervious cement concrete. 2.1.5 Permeability coefficient An index indicating the water permeability of pervious cement concrete. 2.1.6 Light load road Urban roads, and roads such as parking lots and residential areas, on which only vehicles with an axle load of less than 40 kN are allowed to travel. 2.1.7 Total pervious structure Road structure system where road surface water can directly penetrate into the subgrade soil through the surface and base of the road. 2.1.8 Semi-pervious structure Road structure system where road surface water can only penetrate into the surface and not into the subgrade soil. 2.2 Symbols h1 – pervious cement concrete pavement surface thickness; 4.2 Surface design 4.2.1 When the sidewalk design adopts a total pervious structure, its pervious cement concrete surface strength level shall not be less than C20, and its thickness (h1) should not be less than 80 mm. For other pavements, when using the total pervious structure, its pervious cement concrete surface strength level shall not be less than C30, and its thickness (h1) should not be less than 180 mm; when using the semi-pervious structure, its pervious cement concrete surface strength level shall not be less than C30, and its thickness (h1) should not be less than 180 mm. 4.2.2 The structure design of the pervious cement concrete pavement is divided into monochrome layer or two-color combination layer. When the two-color combination layer is adopted, the thickness of the surface layer shall not be less than 30 mm. 4.2.3 The pervious cement concrete pavement shall be designed with vertical and transverse joints. The distance between vertical joints shall be determined according to the width of the pavement in the range of 3.0 m ~ 4.5 m. The distance between transverse joints should be 4.0 m ~ 6.0 m; the plane view size of the square should not be greater than 25 m2, and the length-width ratio of the surface plate should not exceed 1.3. When the base has structural joints, the surface contraction joint shall be consistent with the position of the corresponding structural joint, and flexible materials shall be filled in the joint. 4.2.4 When the construction length of the pervious cement concrete pavement exceeds 30 m, expansion joints shall be set. Expansion joints shall be set at the connection between the pervious cement concrete pavement and other constructions such as side gutters, buildings, gutter inlets, surfacing blocks and asphalt pavement. 4.3 Drainage system design 4.3.1 The drainage design of pervious cement concrete pavement should comply with the relevant provisions of the current industry standard Code for design of urban road engineering, CJJ 37. 4.3.2 When designing the total pervious structure, drainage under the pavement shall be considered. The drainage under the pavement can be set with drainage blind ditch which shall be connected to the municipal drainage system during the road design. The combination of the gutter inlet with the base and the surface shall be designed into the pervious form to facilitate the gathering of excess water from the base to the gutter inlet. Impervious geotextile with a width of not less than 1 m shall be set on the subgrade surface around the gutter inlet (Figure 4.3.2). 4.3.3 When designing the drainage system, municipal drainage ditches or gutter inlets can be used. The pervious cement concrete can be directly laid to the municipal drainage ditches or gutter inlets. Squares of large area should be set with drainage blind ditches (Figure 4.3.3). 5 Construction 5.1 General requirements 5.1.1 Before construction, the construction site shall be inspected, the location and elevation of underground hidden facilities shall be reviewed, the construction plan shall be determined based on the design documents and construction conditions, and the construction organization design shall be prepared. 5.1.2 Before construction, water and electricity supply, traffic roads, mixing and stacking sites, work sheds and warehouses, fire protection and other facilities shall be solved. The construction site shall be equipped with a rainproof and moisture-proof material storage area. Materials shall be stacked according to markings and must not be thrown randomly during loading, unloading and transportation. 5.1.3 Before surface layer construction, the base layer and drainage system shall be inspected and accepted according to regulations. Surface layer construction can only be carried out after meeting the requirements. 5.1.4 Before the construction of the pervious cement concrete pavement, the base layer shall be cleaned, and the treated base surface shall be rough, clean, free of water, and kept in a certain moist state. 5.1.5 The construction site shall be equipped with auxiliary equipment, auxiliary materials, and construction tools required for construction, and shall be provided with safety protection facilities. 5.2 Mixing and transport 5.2.1 Pervious cement concrete should be mixed with a mandatory mixer. The capacity of the mixer shall be selected based on parameters such as engineering quantity, construction progress, construction sequence, and transportation means. The transportation time of fresh concrete from the machine to the working surface should not exceed 30 minutes. 5.2.2 The raw materials entering the mixer must be measured accurately and shall meet the following requirements: 1 Bagged cement shall be randomly checked for accuracy of bag weight; 2 The moisture content of the aggregate shall be accurately measured before mixing in each shift, and the water consumption in the pervious cement concrete ratio shall be adjusted based on the moisture content of the aggregate. The construction mix proportion shall be determined through on-site testing; 3 The allowable error of pervious cement concrete raw materials (by mass) shall not exceed the following regulations: 2) The plane position and elevation of the formwork shall meet the design requirements, and the surface of the formwork in contact with the concrete shall be coated with separant. 3) Before paving the pervious cement concrete mixture, a comprehensive inspection shall be conducted on th.......Source: https://www.ChineseStandard.net/PDF.aspx/CJJT135-2009 |