I. Quality Requirements of Coarse Aggregate in Permeable Asphalt Mixture
The quality requirements of the coarse aggregate in the mixture are as follows with reference to the urban road engineering standards:
Stone crush value Loss of wear in Los Angeles Apparent density Visual water rate Adhesion to asphalt Robustness Slender flat particle content Washing method particle content Soft stone content Stone polishing value Stone impact value Broken crushing area | Not more than 30% Not more than 40% Not less than 2.45t/m3 Not more than 3% Not less than level 3 Not more than 12% Not more than 20% Not more than 1% Not more than 5% Not less than (BPN)42 Not more than 28% Not less than 40% |
II. Quality Requirements of Fine Aggregate in Permeable Asphalt Mixture
The fine aggregate in the mixture can use natural sand, machine-made sand and stone chips, and the appearance of fine aggregate should be clean, dry, non-weathering, and free from impurities, and there should be appropriate particle gradation. Fine aggregates should have good bonding with asphalt.
See Table 1 for specifications of natural sand for mixes. See Table 2 for the quality of fine aggregates. Stone chip specifications are shown in Table 3.
Specification of Natural Sand in Mixture Table 1
Square hole sieve (mm) | Round hole sieve (mm) | Percentage of mass passing through each mesh (%) | ||
coarse sand | Zhongsha | Fine sand | ||
9.50 | 10 | 100 | 100 | 100 |
4.75 | 5 | 90~100 | 90~100 | 90~100 |
2.36 | 2.5 | 65~95 | 75~100 | 85~100 |
1.18 | 1.2 | 35~65 | 50~90 | 75~100 |
0.6 | 0.6 | 15~29 | 30~59 | 60~84 |
0.3 | 0.3 | 5~20 | 8~30 | 15~45 |
0.15 | 0.15 | 0~10 | 0~10 | 0~10 |
0.075 | 0.075 | 0~5 | 0~5 | 0~5 |
Fineness modulus Mx | 3.7~3.1 | 3.0~2.3 | 2.2~1.6 | |
Fine aggregate quality requirements Table 2
Pilot projects | index | Pilot projects | index | |
Visual density not less than (t/m3) | 2.45 | Sand equivalent is not less than (%) | 50 | |
Solidity> 0.3mm not more than (%) | 12 |
Chip Specifications Table 3
specification | Nominal particle size (mm) | Percentage of mass passing through the following mesh (%) | |||||
Square hole sieve (mm) | 9.5 | 4.75 | 2.36 | 0.6 | 0.075 | ||
Round hole sieve (mm) | 10 | 5 | 2.5 | ||||
S15 | 0~5 | 100 | 85~100 | 40~70 | - | 0~15 | |
S16 | 0~3 | 100 | 85~100 | 20~50 | 0~15 | ||
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