Wang Xiaowei, Hu Xinyu, Ji Xiaoping, Chen Bo, Chen Hongqing
School of Civil Engineering, Xi'an University of Architecture & Technology, Xi'an 710055, China.
Key Laboratory of Special Area Highway Engineering of Ministry of Education, Chang'an University, Xi'an 710064, China.
Materials (Basel). 2021 Oct 16;14(20):6141. doi: 10.3390/ma14206141.
The high pavement temperature plays an important role in the development of urban heat island (UHI) in summer. The objective of this study was to develop water retentive and thermal resistant cement concrete (WTCC) to enhance the pavement cooling effects. The WTCC was prepared by combining a water retentive material and a high aluminum refractory aggregate (RA) with porous cement concrete (PCC). Water retention capacity test, fluidity test, and compressive strength test were used to determine the composition ratio of the water retentive material. Mechanical performance and cooling effects of WTCC were evaluated by compressive and flexural strength tests and temperature monitoring test. The mass ratios of fly ash, silica fume, cement, and water in the water retentive material were determined as 65:35:15:63.9. The compressive strength and the flexural strength of WTCC after 28 days curing were 30.4 MPa and 4.6 MPa, respectively. Compared with stone mastic asphalt (SMA) mixture, PCC, and water retentive cement concrete (WCC), surface temperature of WTCC decreased by 11.4 °C, 5.5 °C, and 4.1 °C, respectively, and the internal temperatures of WTCC decreased by 10.3 °C, 6.1 °C, and 4.6 °C, respectively. The water retentive material has benefits of strength improvements and temperature reduction for WTCC. Based on the results, WTCC proved to have superior cooling effects and the potential to efficiently mitigate the UHI effects and be used in medium traffic roads.
夏季，路面高温在城市热岛（UHI）形成过程中起着重要作用。本研究的目的是开发保水隔热水泥混凝土（WTCC），以增强路面降温效果。WTCC是通过将保水材料和高铝耐火骨料（RA）与多孔水泥混凝土（PCC）混合制备而成。通过保水能力试验、流动性试验和抗压强度试验来确定保水材料的组成比例。通过抗压强度试验、抗折强度试验和温度监测试验来评估WTCC的力学性能和降温效果。保水材料中粉煤灰、硅灰、水泥和水的质量比确定为65:35:15:63.9。养护28天后，WTCC的抗压强度和抗折强度分别为30.4MPa和4.6MPa。与沥青玛蹄脂碎石（SMA）混合料、PCC和保水水泥混凝土（WCC）相比，WTCC的表面温度分别降低了11.4℃、5.5℃和4.1℃，内部温度分别降低了10.3℃、6.1℃和4.6℃。保水材料对WTCC具有增强强度和降低温度的作用。基于这些结果，WTCC被证明具有优异的降温效果，有潜力有效缓解城市热岛效应，并可用于中等交通量道路。
