Physical method for lowering surface layer temperature of asphalt mixture
An asphalt mixture and surface temperature technology, which is applied in the field of road engineering materials, can solve the problems of increasing the temperature of asphalt pavement, rutting disease, affecting the comfort and safety of asphalt pavement, etc., so as to prolong the service life of the road and improve the high temperature stability. Effect
Inactive Publication Date: 2018-12-14
YANGZHOU UNIV
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Problems solved by technology
The increase in temperature directly leads to the increase in the temperature of the asphalt pavement, and the heat accumulates in the structure of the asphalt pavement, which may even be higher than the temperature of the road surface, which will cause serious rutting and other diseases, affecting the comfort and safety of the asphalt pavement , seriously reducing the service life of asphalt pavement
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[0042] 1. To prepare full-thickness rut plate specimens (300mm×300mm×150mm), three 5cm rut plate molds and two 3cm rut plate molds are required, and holes should be drilled around the molds so that the sensor can pass through the holes (to prevent the rut instrument from being pressed in real time. heat flow sensor and temperature sensor are cut off). The entire test piece is composed of the first test piece, the second test piece, the third test piece and the fourth test piece, and the embedding positions of the first temperature sensor, the second temperature sensor, the third temperature sensor and the fourth temperature sensor are respectively the whole The test piece is 2cm, 4cm, 6cm, 8cm away from the upper surface.
[0043] First prepare the first test piece with a height of 8 cm, and dig 1 cm to bury the S-shaped seamless steel pipe inside the first test piece. The S-shaped seamless steel pipe consists of two elbows and three parallel straight pipes, and three parall...
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Abstract
The invention discloses a physical method for lowering the surface layer temperature of an asphalt mixture. A full-thickness rutting test piece is prepared according to the heat flow sensing testing method; Temperature sensors, a heat flow sensor and roundaboutly arranged seamless steel tubes are embedded in the test piece; the distances from the temperature sensors to the upper surface of the test piece are 20 mm, 40 mm, 60 mm and 80 mm separately; the heat flow sensor is embedded on the outer wall of the middle steel tube; the distance from each of the steel tubes to the surface of the testpiece is 80 mm; during the heat collection process, 2*275W infrared lamps are adopted as the irradiation light sources; the distance between the centers of the infrared lamps is 56.5 cm; the distancefrom the center of each of the infrared lamps to the surface of the test piece is 30 cm. At first, the cooling process after warming a road surface is simulated, and variation of the temperature and the heat flow density of each measuring point is measured; and then, the simultaneous ongoing process of road surface warming and water cooling is simulated, variation of the temperature and the heat flow density of each measuring point is measured, a line graph is utilized to compare the temperature and heat flow variation trend of the two cooling methods, the two cooling method comprise first radiation and then water adding, and simultaneous ongoing process of radiation and water adding, and a better method of cooling of the two working conditions is obtained.
Description
technical field [0001] The invention belongs to the technical field of road engineering materials, and in particular relates to a physical method for reducing the surface temperature of asphalt mixture. Background technique [0002] Asphalt mixture has the advantages of high flatness, good continuity, small running jitter, short construction period and convenient maintenance and repair, so it is widely used. In recent years, the application of asphalt pavement has continued to grow, especially the growth of high-grade asphalt pavement. However, as the global climate warms and the global temperature continues to rise, the temperature of the asphalt pavement also continues to rise. Coupled with the continuous increase in traffic volume, serious rutting and other diseases are caused, which seriously affect the performance of the road. At present, road workers are focusing on how to reduce the temperature of asphalt pavement and how to improve the high temperature stability of ...
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Login to View More IPC IPC(8): G01N25/20
CPCG01N25/20
Inventor 李波冒慧文程壮陆鹏程
Owner YANGZHOU UNIV