The Estimation Model of Heat Conduction Effect for Combination Structure with Conductive Gussasphalt Concrete
CHEN Qian1, WANG Chaohui1, FAN Zhentong1, HOU Rongguo2, CHEN Jiao1,3
1 School of Highway, Chang'an University, Xi'an 710064 2 Research Institute of Highway, Ministry of Transport, Beijing 100088 3 ZHONGJIAOTONGLI Construction Co.,Ltd, Xi'an 710075
Abstract: To determine the heat conduction effect and the snow melting time of combination structure with conductive gussasphalt concrete, the heat conduction principle of combination structure with conductive gussasphalt concrete was studied systematically. The estimation model of heat conduction effect for the upper layer on the combination structure with conductive gussasphalt concrete was established. The surface temperatures on the upper layer of the combination structure were measured and estimated at different ambient temperature, thickness of structure layer and electrified time. The snow melting time of conductive gussasphalt concrete was determined. The accuracy of the estimation model for combination structure with conductive gussasphalt concrete was analyzed and verified with pearson correlation method. It lays a foundation for the popularization and application of conductive gussasphalt concrete in the field of bridge deck pavement. The results show that the heat conduction process of the combination structure with conductive gussasphalt concrete is a heat conduction process with transient and unsteady. At different environment conditions, the surface temperatures on the upper layer of the combination structure can be divided into three stages, such as the initial rise, the mid-term turn, and the later decline. Their estimation errors are maintained at 0.2—0.8 ℃, 0.3—1.2 ℃ and 0.7—5.5 ℃, respectively. The estimation error of snow melting time is maintained at about 16 min. At different ambient temperature, thickness of structure layer and electrified time, the coefficients (R) between the test values and estimation values calculated of surface temperatures for combination structure with conductive gussasphalt concrete by the estimation model are between 0.974 0 and 0.989 0. The conspicuous level values (P) are less than 0.01 and the judgment coefficients (R2) are between 0.948 7 and 0.978 1. It means that there is a good correlation between estimation values and test values. That is to say, the estimated result is accurate.
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2019, Vol. 33 
