Novel temperature adjusting asphalt pavement structure
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A technology of asphalt pavement and asphalt, which is applied in the field of new temperature-adjusted asphalt pavement structure, and can solve problems such as rutting that cannot be fundamentally solved
Inactive Publication Date: 2017-07-14
CHANGSHA UNIVERSITY OF SCIENCE AND TECHNOLOGY
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Problems solved by technology
[0003] At present, in order to deal with the rutting damage, the high-temperature stability of asphalt and asphalt mixture is
Method used
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Embodiment 1
[0022] Determine the mass percentage of each dosage of ordinary asphalt mixture for the design of temperature-adjusted structural layer, 42% coarse aggregate (4.75mm ~ 13.2mm), 47.5% fine aggregate (0.075mm ~ 4.75mm), 5.7% slag powder and 4.8% 70# matrix asphalt.
[0024] Water bath at 90°C for 0.5h, vacuumize for 1h, heat filter for 24h, cool down, grind and sieve for later use.
[0025] The design of the heat-absorbing asphalt middle surface layer: keep the mass percentage of the coarse aggregate, mineral powder and asphalt of the asphalt mixture unchanged, adjust the mass of the fine aggregate (0.075mm to 4.75mm) to 39.2%, and the mixing ratio of the composite phase change material to 8.3 %.
[0026] Molding of the middle surface layer test piece: After preheating, the coarse and fine aggregates are mixed with a mixer for 90s, ...
Embodiment 2
[0031] Determine the mass percentage of each dosage of ordinary asphalt mixture for the design of temperature-adjusted structural layer, 42% coarse aggregate (4.75mm ~ 13.2mm), 47.5% fine aggregate (0.075mm ~ 4.75mm), 5.7% slag powder and 4.8% 70# matrix asphalt.
[0033] Water bath at 90°C for 0.5h, vacuumize for 1h, heat filter for 24h, cool down, grind and sieve for later use.
[0034] The design of the heat-absorbing asphalt middle surface layer: keep the mass percentage of the coarse aggregate, mineral powder and asphalt in the asphalt mixture unchanged, adjust the mass of the fine aggregate (0.075mm to 4.75mm) to 42.2%, and the mixing ratio of the composite phase change material to 5.3 %.
[0035] Molding of the middle surface layer test piece: After preheating, the coarse and fine aggregates are mixed with a mixer for 90s, ...
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Abstract
The invention relates to a novel temperature adjusting asphalt pavement structure comprising a heat conducting asphalt upper face layer and a heat absorbing asphalt intermediate face layer. The asphalt upper face layer is mixed with carbon fibers and graphite powder to form a heat conducting asphalt structural layer. The intermediate face layer is mixed with vacuum impregnating polyethylene glycol/expanded perlite composite materials to form a heat absorbing asphalt structural layer. The novel temperature adjusting asphalt pavement structure has the advantages that the heat conducting asphalt structural layer guides pavement radiation into the asphalt intermediate and lower face layers; the heat absorbing asphalt structural layer absorbs heat through solid and liquid phase change of the composite materials, so that the temperatures of the asphalt intermediate and upper face layers are reduced simultaneously, and a pavement temperature filed is adjusted; and producing of tracing rut diseases on asphalt pavement in the high temperature weather in summer is alleviated, and the urban heat island effect is relieved while pavement performance is guaranteed.
Description
technical field [0001] The invention belongs to the technical field of road engineering, and relates to a novel temperature-regulating asphalt pavement structure, which can effectively reduce the temperature of the pavement, relieve high-temperature diseases of the pavement, and achieve the effect of alleviating the urban "heat island effect". Background technique [0002] Asphalt pavement is widely used due to its advantages of flat and seamless surface, comfortable driving, low noise, and easy maintenance and repair. Among the existing 130,000 kilometers of expressways in China, more than 90% are asphalt pavement. Summer is hot in most parts of my country, and the temperature can reach above 35°C. Due to the low reflectivity of asphalt pavement to solar radiation, the road surface temperature can reach about 70°C. On the one hand, it will also affect the thermal environment around the road and aggravate the urban "heat island effect". [0003] At present, in order to deal ...
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