Experimental study on materials composition design and mixture performance of water-retentive asphalt concrete
Experimental study on materials composition design and mixture performance of water-retentive asphalt concrete
复制标题
DOI：
10.1016/j.conbuildmat.2016.02.070
复制
发表时间：
2016-05-15
影响因子：
7.4
通讯作者：
Apeagyei, Alex
中科院分区：
文献类型：
--
作者：
Jiang, Wei;Sha, Aimin;Apeagyei, Alex
保水性沥青混凝土（WRAC）是将保水性沥青浆体（WRS）掺入多孔沥青混凝土（PAC）中制成的一种新型材料，可显著降低路面表面温度，是缓解城市热岛效应的有效手段。在室内试验和微观结构分析的基础上，研究了不同粉煤灰掺量、氢氧化钙掺量和掺水量对新拌水玻璃工作性的影响。此外，还测定了固化（硬化）WRS的吸水率、抗压强度和抗折强度。为了更好地了解水化程度和孔结构对硬化WRS的吸水能力和力学性能的影响，使用扫描电子显微镜检查硬化WRS的微观结构。结果表明，材料组成对保水水泥浆体的吸水率、抗压强度、抗折强度以及新拌水泥砂浆的工作性能有显著影响。WRAC表现出良好的抗湿性，抗车辙性和低变形阻力的控制PAC。然而，与对照PAC相比，使用WRAC导致温度下降约10摄氏度。(c)2016爱思唯尔有限公司版权所有。
Water-retentive asphalt concrete (WRAC), produced by incorporating water-retentive slurry (WRS) into porous asphalt concrete (PAC), could significantly reduce the surface temperature of pavements and is currently considered a promising tool for alleviating urban heat island effect. Based on laboratory test and microstructural analysis, the present study investigated the effects of varying the proportions of ground granulated blast furnace fly ash, calcium hydroxide and mixing water amount on workability of fresh WRS. In addition, the water absorbing capacity, compressive strength and flexural strength of the cured (hardened) WRS were determined. The microstructures of hardened WRS were examined using scanning electron microscopy in order to better understand the effect of hydration level and pore structure on the water absorbing capacity and mechanical properties of hardened WRS. The results showed that materials composition have significant effects on the water absorbing capacity, compressive strength and flexural strength of hardened water-retentive slurry, as well as the workability of fresh WRS. WRAC showed good moisture resistance, rutting resistance and low deformation resistance comparable to the control PAC. However, the use of WRAC resulted in a temperature drop of about 10 degrees C compared to the control PAC. (c) 2016 Elsevier Ltd. All rights reserved.