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Title:: Coupling effect of temperature and roughness on the pullout strength ofconcrete bridge deck interlayer

Author(s):: KONG Lingyun1; HUANG Linhuo2; DAI Li3; YU Miao1; (1. National and Local Joint Laboratory of Transportation and Civil Engineering Materials, Chongqing JiaotongUniversity, Chongqing 400074, China; 2. School of Materials Science and Engineering, Chongqing JiaotongUniversity, Chongqing 400074, China; 3. Linzhi Highway Branch of Tibet Autonomous Region HighwayBureau, Linzhi 860000, Tibet, China)

Keywords:: road engineering; bridge deck pavement; principal component analysis; coupling effect; pullout strength of interlayer; roughness; temperature

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DOI:: -

Abstract:: To study the coupling effect of roughness and temperature on the interlayer pullout strength of concrete bridge deck, concrete specimens with different roughness were prepared at first, and their friction coefficients, structural depth and gray values were measured. SBS modified asphalt was coated on the surface of concrete specimens as bonding layer, and rutting board was made with asphalt mixture and core drilling was taken. The core samples of rutting plate were insulated at different temperatures, and then the pullout strength was obtained by pullout test. The principal component analysis method was used to transform the friction coefficient, structure depth and gray value into the comprehensive index of roughness. Finally, the pullout strength and comprehensive index of roughness were linearly fitted. The results show that when the temperature ranges from 20 ℃ to 28 ℃, the change of pullout strength caused by increasing temperature by 1 ℃ is equivalent value to the change caused by decreasing roughness by 1 roughness equivalent when the temperature is constant. In this temperature range, the influence of temperature on pullout strength is obviously greater than that of roughness. Secondly, when the temperature are 20 ℃, 23 ℃, 25 ℃ and 28 ℃, the correlation coefficient between pullout strength and roughness and the influence of roughness on pullout strength are higher than other test temperatures. When the temperature is 30 ℃, compared with 28 ℃, the correlation coefficient between pullout strength and roughness decreases by 62.2% and the slope of fitting equation decreases by 58.2%, indicating that the linear correlation between them and the influence of roughness on pullout strength both decrease significantly. When the temperature is greater than 30 ℃, the linear correlation between pullout strength and roughness is very weak. The slope of fitting equation is close to 0, indicating that the change of roughness hardly affects pullout strength. 5 tabs, 5 figs, 29 refs.

Coupling effect of temperature and roughness on the pullout strength ofconcrete bridge deck interlayer(PDF)

长安大学学报（自然科学版）[ISSN:1006-6977/CN:61-1281/TN]

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