High-temperature performance evaluation method for newly paved asphalt concrete pavement
A technology of asphalt concrete, high temperature performance, applied in the directions of flow characteristics, measuring devices, instruments, etc., can solve the problems of low surface temperature, difficulty in simulating newly laid asphalt concrete, inability to accurately evaluate the high temperature stability of newly laid asphalt concrete, etc. The effect of the means of realization, the simple realization of the means
Active Publication Date: 2018-09-04
NANJING FORESTRY UNIV
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Problems solved by technology
During the paving and rolling of newly paved asphalt concrete and the subsequent cooling process, the asphalt concrete on the surface layer exchanges heat with the air, and the cooling range is significantly greater than that of the asphalt concrete inside, making it present a temperature field with a low surface temperature and a high internal temperature Therefore, the commonly used constant temperature insulation method is difficult to simulate the actual temperature of new asphalt concrete before it is opened to traffic, and cannot accurately evaluate the high temperature stability of new asphalt concrete. It is necessary to study a simplified method for evaluating the temperature field equivalent of new asphalt concrete Its high temperature stability
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[0022] Aiming at the difficult problem of evaluating the high-temperature performance of newly paved asphalt concrete pavement, the idea of the present invention is to use the temperature field of newly formed asphalt concrete indoors to simulate the temperature field of newly paved asphalt concrete on site under different climate and ambient temperature conditions. However, the laboratory often conducts creep tests under certain temperature conditions, which cannot well simulate the temperature field conditions of indoor concrete. Therefore, in order to simulate the actual temperature conditions of newly paved asphalt concrete, the indoor temperature field needs to be further equivalent to a feasible constant temperature for creep tests. For this reason, the present invention proposes to obtain the equivalent temperature under a certain temperature field based on the principle of uniaxial penetration strength equivalent, and uses the penetration strength as an equivalent ind...
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Abstract
The invention discloses a high-temperature performance evaluation method for a newly paved asphalt concrete pavement. The high-temperature performance evaluation method comprises the steps of testinguniaxial penetration strength of indoor formed asphalt concrete test piece under a temperature field condition; testing a relation curve between the uniaxial penetration strength of the indoor formedasphalt concrete test piece and a constant temperature under a constant temperature condition, wherein the constant temperature corresponding to the uniaxial penetration strength as an equivalent temperature of the temperature field; and evaluating the high-temperature performance of the newly paved asphalt concrete pavement according to the equivalent temperature. Compared with the prior art, thehigh-temperature performance evaluation method has the advantages that the temperature field in the cooling process of the newly paved asphalt concrete pavement can be relatively accurately simulatedin an indoor environment, and the high-temperature performance of the newly paved asphalt concrete pavement can be accurately evaluated.
Description
technical field [0001] The invention relates to a method for evaluating the performance of asphalt concrete pavement, in particular to a method for evaluating the high-temperature performance of newly paved asphalt concrete pavement. Background technique [0002] Asphalt pavement has the advantages of good driving comfort and convenient maintenance. Most of the new high-grade highways and urban roads in the world use asphalt pavement. As we all know, asphalt is a typical temperature-sensitive material, and its mechanical properties and road performance change with temperature. The viscosity of asphalt decreases with the increase of temperature, and its state also develops from brittle and hard solid at low temperature to viscoelastic at normal temperature, and softens and presents a fluid state at high temperature. Asphalt mixture is a combination of asphalt and mineral aggregates. When the temperature is high, due to the sharp drop in the viscosity of asphalt, the cohesion...
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IPC IPC(8): G01N11/12G01N25/00
CPCG01N11/12G01N25/00
Inventor 马翔袁则瑜周培圣李强
Owner NANJING FORESTRY UNIV