A design method of heat resistance sma-13 mineral material gradation
A design method and thermal resistance technology, applied to roads, on-site paved condensate pavements, roads, etc., can solve the problem of inaccurate particle size control, inability to fully utilize the thermal resistance properties of thermal resistance materials, and inability to achieve thermal resistance properties, etc. problem, to achieve the best matching, thermal resistance performance improvement, and the effect of mitigating the impact
Active Publication Date: 2018-05-08
CHANGAN UNIV
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Problems solved by technology
At present, domestic research on heat-resistance asphalt mixtures is mainly achieved through the overall replacement of thermal-resistance materials for coarse aggregates or coarse aggregates in a certain particle size range. The grasp of the diameter is not accurate, and the thermal resistance performance of the thermal resistance material cannot be fully utilized, so the best match between the thermal resistance performance and the road performance cannot be achieved.
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Embodiment 1
[0048] 1) SMA-13 mineral material gradation
[0049] Mineral powder: machine-made sand: 2.36~4.75mm non-thermal resistance gravel: 4.75~9.5mm non-thermal resistance gravel: 9.5~13.2mm non-thermal resistance gravel: 13.2~16.0mm non-thermal resistance gravel=X 1 :X 2 :X 3 :X 4 :X 5 :X 6 =11:7.6:6.1:40:29.9:5.4.
[0050] 2) 2.36 ~ 4.75mm refractory gravel dosage design
[0051] On the basis of step 1), replace 2.36-4.75mm non-thermal resistance gravel with 2.36-4.75mm refractory gravel in a certain proportion. The replacement ratios are 0 and 100% respectively, and the amount (mass) of 2.36-4.75mm refractory crushed stones is respectively: 0 and 0.83X 3 , corresponding to 2.36 ~ 4.75mm non-thermal resistance gravel content (mass) are: X 3 and 0.
[0052] The road performance and thermal resistance performance of the above two groups with different 2.36-4.75mm refractory gravel content of SMA-13 were tested, and the test results are shown in Table 1 and Table 2 respec...
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Abstract
The invention provides a mineral material gradation design method for a thermal resistance asphalt pavement surface layer mixture. The present invention is based on the mineral material gradation of the non-heat-resistance asphalt pavement surface layer mixture, and replaces the coarse aggregate within the corresponding particle size range with multiple groups of heat-resistant materials in the particle size range; the reduction in road performance is not higher than 5-20% and the replacement ratio corresponds to the best thermal resistance performance of the surface layer compound on the principle of determining the replacement ratio. According to the design method provided by the present invention, the thermal resistance asphalt pavement surface mixture obtained by the design method is compared with the common surface mixture, while the maximum decrease in road performance is no more than 14.3%, and the thermal resistance performance can be increased by 12.8%, realizing the thermal resistance. The best match between resistance performance and road performance.
Description
technical field [0001] The invention relates to the technical field of traffic civil engineering applications, in particular to a mineral material gradation design method for heat-resistant asphalt pavement surface layer mixture. Background technique [0002] Asphalt mixture is a kind of viscoelastic material, and the influence of temperature on it is very significant. At the same time, due to the heat absorption performance of asphalt material, under the action of strong solar radiation, the temperature of asphalt pavement is much higher than the ambient temperature, which aggravates the occurrence of rutting and other diseases. occur. In recent years, with global warming, the temperature of pavement in summer has been increasing year by year, and the impact of ordinary asphalt pavement on urban heat island effect has become increasingly prominent. Therefore, it has become the main research direction of road workers to take a reasonable way to control the accumulation of i...
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IPC IPC(8): E01C7/18
CPCE01C7/182
Inventor 蒋应军陈浙江薛金顺杨晨光李寿伟李湾湾杨超群
Owner CHANGAN UNIV