Experimental study on the polyurethane-bound pervious mixtures in the application of permeable pavements
Experimental study on the polyurethane-bound pervious mixtures in the application of permeable pavements
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DOI：
10.1016/j.conbuildmat.2019.01.051
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发表时间：
2019-03-30
影响因子：
7.4
通讯作者：
Oeser, Markus
中科院分区：
文献类型：
--
作者：
Lu, Guoyang;Renken, Lukas;Oeser, Markus
透水性路面被广泛认为是恢复城市道路系统自然渗透等生态功能的有效途径。然而，气孔结构往往暴露在空气和水分中，加速了传统路面材料的老化，降低了路面的耐久性。近年来，聚氨酯(PU)粘结剂的发展和优化，通过极大地改善骨料-骨料接触点的机械连接，促进了PUPM的优异性能，从而有效地延长了透水性路面的使用寿命。然而，由于PUPM具有不同于传统路面材料的力学性能，其主要力学行为和破坏过程仍不清楚。本研究采用改良的试验方法，结合混凝土和沥青的标准，对其主要力学性能进行了表征。结果表明，由于骨料与PU粘结剂之间具有良好的粘结性能，PUPM具有优异的压缩和拉伸强度。不同级配的PUPM表现出不同的破坏特征，通过调整骨料级配可以提高延性。此外，还考察了PUPM变种的功能性能，并与传统的排水性沥青(PA)进行了比较。PUPM的导水率和声学性能均优于PA。具体地说，解决了较长的路面力学和功能耐久性问题。本研究为PU粘结剂在透水性路面中的应用以及对PUPM路面功能的理解提供了重要的参考。(C)2019爱思唯尔有限公司。保留所有权利。
Permeable pavements have been widely regarded as an effective way to restore the ecological functionality of urban road systems such as natural infiltration properties. However, pore structures are usually exposed to the air and moisture which accelerate the aging of conventional pavement materials and reduce the durability of the pavement. The development and optimization of polyurethane (PU) binder in recent years, has facilitated excellent performance of polyurethane-bound pervious mixtures (PUPM) by greatly improving the mechanical connection at aggregate-aggregate contact points and thereby effectively extends the service life of permeable pavements. However, due to the different mechanical behavior compared to conventional pavement materials, the primary mechanical behavior and failure process of PUPM are still unclear. This study characterizes the primary mechanical behavior by using modified testing methods and combining standards of concrete and asphalt. The results show outstanding compressive and tensile strength of PUPM due to the excellent adhesion properties between aggregate and PU binder. Different failure characteristics were presented by differently graded PUPM variants, where the ductility can be increased by adjusting the aggregate gradation. Further, functional properties of PUPM variants were also examined and compared with conventional porous asphalt (PA). Both the hydraulic conductivity and acoustic properties of PUPM were observed to be superior to those of PA. Specifically, longer pavement mechanical and functional durability was addressed. This study provides an important reference for the application of PU binder in pervious pavement and the understanding on the pavement functionality of PUPM. (C) 2019 Elsevier Ltd. All rights reserved.