Porous Cement Pavement(Material)with High Reflectance and Water Retention and Heat Resistance

Jianwei Fu1, Peifu We1, Bo Zhou2, He Chen2

1Guizhou Provincial Highway Development Co., Ltd, Guiyang, 55000, China

2Changan University & the Second Highway Engineering Co., Ltd., China Communications Construction Co., Ltd.

Xian, 710000, China

Abstract: In this paper, by theoretical analysis, laboratory tests and other means, based on water retention, heat resistance and high reflection technology integration.To develop high reflectance water retaining and thermal resistant cement concrete(HWTCC), which can alleviate urban heat island effect ,water retaining materials including cement, silicon fume and fly ash were poured into thermal resistant porous cement concrete, which adopted high aluminum refractory gravel as aggregate. Its temperature reduction effect was validated, and compressive strength and flexural strength were tested as well. The results showed the compressive strength of HWTCC at 28d and 90d were 30.4Mpa and 42.1Mpa respectively, flexural strength at 28d and 90d were 4.6Mpa and 6.1Mpa. It was contrastively lower than porous cement concrete and water retaining cement concrete(WCC) with common gravel, but still met the requirement of heavy traffic pavement design of China. Compared with SMA, PCC, WCC, the highest temperature of WTCC decreased by 11.4℃,5.5℃and 4.1℃ on the surface, and 10.3℃,6.1℃ and 4.6℃ in the inner part, respectively.the highest temperature of HWTCC decreased by 16.4℃,8.7℃and 6.6℃ on the surface, and 15.5℃,9.1℃ and 7.2℃ in the inner part, respectively.

Keywords: Heat island effect; Temperature; Water retention; Thermal resistance; Temperature reduction