ABSTRACT

Tack coat binder is much softer shortly after construction compared to that after aging during in-service life which raises the likelihood of early-age interlayer shear failure. This study was undertaken to evaluate the effects of tack coat type (CRS-2P, CSS-1h, and SS-h), application rate (0, 0.140, 0.281, and 0.702 L/m2), surface texture (grooved Portland Cement Concrete (PCC), new, aged and worn, and milled Hot-Mix Asphalt (HMA)), and freeze–thaw (F-T) cycles on early-age Interlayer Shear Strength (ISS) of laboratory-compacted samples. It was found that, tack coats with a hard binder grade applied at a low residual rate resulted in higher early-age ISS values compared to those prepared using a polymer-modified tack coat. F-T cycles were not found to have a significant effect on the early-age ISS values of specimens with HMA bottom layer. However, all tested tack coats were found to be significantly effective in improving the ISS values of samples with grooved PCC surface texture. For samples compacted on grooved PCC without tack coat, freeze–thaw cycles were found to considerably reduce the ISS values. Application of tested tack coats on grooved PCC was found to mitigate the adverse effect of F-T cycles on ISS values.

摘要

与在使用寿命期间老化后的相比，在施工后不久的粘性涂层粘合剂要软得多，这增加了早期层间剪切失效的可能性。本研究旨在评估粘性涂层类型（CRS-2P、CSS-1h 和 SS-h）、施用量（0、0.140、0.281 和 0.702 L/m2）、表面纹理（槽波特兰水泥混凝土）的影响(PCC)、新的、老化的和磨损的和碾磨的热混合沥青 (HMA)) 和冻融 (FT) 循环对实验室压实样品的早期层间剪切强度 (ISS) 的影响。结果发现，与使用聚合物改性的粘胶制备的粘胶相比，以低残留率施用的具有硬粘合剂等级的粘胶导致更高的早期 ISS 值。未发现 FT 周期对具有 HMA 底层的标本的早期 ISS 值有显着影响。然而，发现所有测试的粘性涂层在改善具有凹槽 PCC 表面纹理的样品的 ISS 值方面都显着有效。对于在没有粘性涂层的凹槽 PCC 上压实的样品，发现冻融循环会显着降低 ISS 值。发现在凹槽 PCC 上应用测试的粘性涂层可以减轻 FT 循环对 ISS 值的不利影响。