保水降温功能水泥混凝土铺面材料组成设计与性能研究

将水泥、粉煤灰和磨细高炉矿渣作为保水材料灌注于多孔水泥混凝土母体中,形成具有保水降温功能的铺面材料。分别提供了多孔水泥混凝土母体和保水材料的设计方法,并成型试件对保水铺面水泥混凝土材料的强度、降温效果和抗冻性进行了测试。实验结果表明设计的多孔水泥混凝土母体和保水材料均满足施工和功能要求,成型的保水降温功能水泥混凝土试件28d抗压强度和抗折强度分别能够达到27.7和38.2MPa;在最高气温为33℃的测试条件下,其表面最高温度比普通水泥混凝土降温7℃左右,但随着水分的减少降温效果变差;此外,冻融后保水降温水泥混凝土抗压强度会下降,但不明显。

Research on water-holding and cooling concrete design method and its performance

Water-holding material containing cement,fly-ash and grinding granulated blast furnace slag were poured into porous cement concrete matrix to form water-holding and cooling concrete.Design methods of porous cement concrete matrix and water-holding material were provided respectively,and water-holding and cooling concrete specimens were made to test strength,cooling effect and freezing resistance performance.Test results show that the porous cement concrete matrix and water-holding material could meet the construction and performance demand.The 28d compressive strength and flexural strength of specimens were 27.7 and 38.2MPa respectively,the surface temperature of water-holding and cooling concrete was 7℃ less than that of ordinary concrete under 33℃ of air temperature,but cooling effect would be reduced along with the decrease of water content.The specimen compressive strength decline was not obvious after freeze thaw cycles.