CJJT135-2009 PDF English
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| CJJ/T 135-2009 | English | 610 |
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CJJ/T 135-2009: [2023 Edition] Technical specification for pervious cement concrete pavement---This is an excerpt. Full copy of true-PDF in English version (including equations, symbols, images, flow-chart, tables, and figures etc.), auto-downloaded/delivered in 9 seconds, can be purchased online: https://www.ChineseStandard.net/PDF.aspx/CJJT135-2009
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.
INDUSTRY STANDARD OF THE
PEOPLE��S REPUBLIC OF CHINA
Technical specification for pervious cement concrete
pavement
Approved by. Ministry of Housing and Urban-Rural Development of the People��s
Republic of China
Implemented from. July 1, 2010
China Architecture & Building Press
2009 Beijing
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
3 Materials... 9
4 Structural combination and tectonic... 14
5 Construction... 18
6 Acceptance... 23
7 Maintenance... 28
Appendix A Test method of permeability coefficient... 29
Explanation of wording in this Specification... 32
Normative standards... 33
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.
2.1.7 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 �C pervious cement concrete pavement surface thickness;
h2 �C pervious cement concrete pavement base thickness;
Ma �C amount of admixture per cubic meter of pervious cement concrete;
RW/C �C water-binder ratio;
3 Materials
3.1 Raw materials
3.1.1 The cement shall be Portland cement with a strength grade of not less than 42.5
or ordinary Portland cement, whose quality shall meet the requirements of the current
national standard Common Portland cement, GB 175.Cement of different grades,
brands, varieties, and production dates must not be mixed during storage and usage.
3.1.2 Admixtures shall comply with the current national standard Concrete admixtures,
GB 8076.
3.1.3 Reinforcer used in pervious cement concrete can be divided into organic materials
and inorganic materials. The material technical indicators shall comply with the
provisions of Table 3.1.3.
3.1.4 The aggregate used in pervious cement concrete must be hard, durable, clean and
dense crushed stone whose performance indicators shall comply with the secondary
requirements in the current national standard Pebble and crushed stone for construction,
GB/T 14685, and shall comply with the provisions of Table 3.1.4.
3.1.5 The water used for mixing pervious cement concrete shall comply with the current
industry standard Standard of water for concrete, JGJ 63.
3.1.6 The requirements for base materials shall comply with relevant specifications.
3.2 Pervious cement concrete
4 Structural combination and tectonic
4.1 Structural combination design
4.1.1 The service life of pervious cement concrete pavement structure shall be
consistent with the effective service life of water permeability.
4.1.2 The subgrade shall be stable, homogeneous, and shall provide uniform support
for the pavement structure.
4.1.3 The base shall have sufficient strength and stiffness.
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.
4.3 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.
5.2 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.
5.3 Pervious cement concrete pavement paving
5.3.1 The construction of ordinary pervious cement concrete pavement shall comply
with the following requirements.
5.4 Joint construction
5.4.1 The cutting depth of pavement contraction joints should be (1/2~1/3) h1; the
pavement expansion joints shall be the same as the thickness of the pavement.
Construction joints can replace expansion joints during construction.
5.4.2 Contraction joints and expansion joints during construction shall be embedded
with elastic joint materials.
5.5 Curing
5.5.1 After the construction of pervious cement concrete pavement is completed,
methods such as covering it with plastic film should be adopted for curing. The curing
time shall be determined based on the strength growth of pervious cement concrete, and
the curing time should not be less than 14 days.
5.5.2 During the curing period, the pervious concrete pavement shall not be opened to
traffic, and the integrity of the covering material shall be ensured.
5.6.7 The construction of pervious cement concrete pavement in summer shall comply
with the following regulations.
5.6.8 When the maximum outdoor temperature reaches 32 ��C and above, construction
should not be carried out.
6 Acceptance
6.1 General requirements
6.1.1 The construction quality of pervious cement concrete pavement shall be inspected
and accepted according to the following requirements.
6.1.2 The following information shall be collected during construction.
6.1.3 When there is doubt or dispute about the quality of pervious cement concrete
during construction, the construction unit shall organize a physical inspection under the
witness of the supervision unit or construction unit. Physical inspection shall be
entrusted to a testing agency with corresponding qualification levels.
6.1.4 When the construction quality of pervious cement concrete pavement does not
meet the requirements, it shall be dealt with according to the following provisions.
6.1.5 Pervious cement concrete pavements that cannot meet the requirements for safe
use after repair or reinforcement are strictly prohibited from acceptance.
6.2 Quality test standards
Dominant items
6.2.1 The quality of raw materials shall meet the following requirements.
6.2.2 In addition to meeting the design requirements, the quality of the pervious cement
concrete pavement surface layer shall also meet the following requirements.
6.2.3 The surface of the pervious cement concrete pavement shall be smooth; the edges
and corners shall be neat; there shall be no falling stones.
Inspection quantity. Full inspection.
Inspection methods. Observation and measurement.
6.2.4 Pavement joints shall be vertical and straight, and there shall be no debris in the
joints.
Inspection quantity. Full inspection.
Inspection method. Observation.
6.2.5 The color of colored pervious cement concrete pavement shall be uniform.
Inspection quantity. Full inspection.
Inspection method. Observation.
6.2.6 The surface stones of the water-washing pervious cement concrete pavement shall
be evenly distributed and shall not be loose.
Inspection quantity. Full inspection.
Inspection method. Observation.
6.2.7 The allowable deviation of pervious cement concrete pavement surface layer shall
comply with the provisions of Table 6.2.7.
7 Maintenance
7.0.1 For pervious cement concrete pavement in winter, timely snow removal and other
measures shall be taken to prevent the pavement from freezing. Mechanical de-icing
should not be used, and sand or ash must not be spread.
7.0.2 After the pervious cement concrete pavement is put into use, in order to ensure
the performance of the pervious cement concrete, high-pressure water (5 MPa ~ 20 MPa)
can be used to flush the pores to remove the blockages, or compressed air can be used
to flush the pores to remove the blockages; vacuum pump can also be used to suction
out debris clogging the pores.
7.0.3 When the pervious cement concrete pavement has cracks and aggregates fall off
in a large area, maintenance must be carried out. During maintenance, the loose
aggregates on the pavement shall be removed first, and the pavement shall be cleaned
to remove dust and debris in the pores before paving with new pervious cement concrete.
......
Source: Above contents are excerpted from the full-copy PDF -- translated/reviewed by: www.ChineseStandard.net / Wayne Zheng et al.
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