Thermal resistance SMA-13 mineral aggregate gradation design method
A design method and technology of thermal resistance, applied in the direction of roads, on-site coagulation pavement, roads, etc., can solve the problem of inability to achieve thermal resistance performance, inaccurate grasp of particle size, and inability to give full play to the thermal resistance performance of thermal resistance materials, etc. problems, to achieve the best matching, improve thermal resistance performance, and alleviate the effects of
Active Publication Date: 2016-06-29
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 grading
[0049] Mineral powder: machine-made sand: 2.36~4.75mm non-thermal resistant crushed stone: 4.75~9.5mm non-thermal resistant crushed stone: 9.5~13.2mm non-thermal resistant crushed stone: 13.2~16.0mm non-thermal resistant crushed stone=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 crushed stone content design
[0051] On the basis of step 1), 2.36~4.75mm refractory crushed stone is replaced by a certain proportion of 2.36~4.75mm non-thermal resistance crushed stone. The replacement ratio is 0 and 100% respectively, and the content (mass) of 2.36~4.75mm refractory crushed stone are respectively: 0 and 0.83X 3 , Corresponding to 2.36~4.75mm non-thermal resistance gravel content (mass) respectively: X 3 And 0.
[0052] The road performance and thermal resistance of the above two groups of SMA-13 with different 2.36~4.75mm refractory macadam content were tested. The test results are shown in Table 1...
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Abstract
The invention provides a thermal resistance SMA-13 mineral aggregate gradation design method. Mineral aggregate gradation of a non-thermal-resistant asphalt pavement surface layer mixed material serves as a basis, and thermal resistance materials in multiple sets of particle size ranges replace coarse aggregate in the corresponding particle size range; the replacement proportion is determined according to the principle that the reduction amplitude of pavement performance is not higher than 5-20%, and thermal resistance performance of the surface layer mixed material corresponding to the replacement proportion is relatively optimal. Compared with a common surface layer mixed material, the maximum reduction amplitude of pavement performance of the thermal resistance asphalt pavement surface layer mixed material prepared through the design method is not higher than 14.3%, thermal resistance performance can be improved by 12.8%, and optimal matching of thermal resistance performance and pavement performance is achieved.
Description
Technical field [0001] The invention relates to the technical field of traffic and civil engineering application, in particular to a mineral material grading design method of a thermal resistance asphalt pavement surface mixture. Background technique [0002] Asphalt mixture is a viscoelastic material, and temperature has a significant effect on it. At the same time, due to the heat absorption performance of asphalt materials, under the action of strong solar radiation, the temperature of asphalt pavement is much higher than the ambient temperature, which exacerbates rutting and other diseases. occur. In recent years, with the global warming, the summer road temperature has been increasing year by year, and the impact of ordinary asphalt pavement on the urban heat island effect has become increasingly prominent. Therefore, it has become the main research direction of road workers to adopt reasonable methods to control the accumulation of internal temperature on the pavement, red...
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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