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Study on Interlayer Bonding Performance of Cement Concrete Bridge Deck
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    Abstract:

    The variation of bonding performance between pavement layers of cement concrete bridge decks with temperature was studied, and the relationship between the temperature properties of the bonding layer and the shear strength of straight shear and oblique shear was explored. The differences in pulling and shear strength of four coating adhesive layers (SBS modified asphalt, WTR modified asphalt, WTR/APAO modified asphalt, AMP-100 second-order reactive adhesive coating) and three modified asphalt crushed stone bonding layers (SBS modified asphalt crushed stone, WTR modified asphalt crushed stone, WTR/APAO modified asphalt crushed stone) were compared and analyzed. Regression analysis was used to obtain the variation law of interlayer intensity with temperature. The study calculated the ratio of the strength between the lower layers and the strength between the lower layers at normal temperature (20 ℃), which was used for the comparative analysis of the temperature sensitivity of the shear strength and the pull strength of the bonding layer; The ratio of oblique shear strength to straight shear strength at different temperatures was also analyzed. The results show that the pull strength between layers, shear strength, and temperature between layers all meet the relationship of a single exponential function, with a goodness of fit R2 above 0.970. The WTR/APAO modified bitumen bond layer and WTR/APAO modified asphalt crushed stone bond layer have excellent mechanical properties, with higher pull and shear strength values at different temperatures than those of the same type of bonding layer. The pulling and shear strength of the AMP-100 bond layer is the least sensitive to temperature. An interlayer strength ratio table of 20~40 ℃ was established for interlayer strength estimation. The oblique shear strength is significantly higher than the straight shear strength, and the sensitivity of the oblique shear strength to temperature is lower than that of the straight shear strength. At temperatures ranging from 20℃ to 45 ℃, the ratio of oblique shear strength to straight shear strength ranges from 1.165 to 2.990.

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  • Received:
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  • Online: July 31,2023
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