酸雨对水泥聚苯模壳抗压及线膨胀系数影响

Effects of the compressive strength and linear expansion coefficient of the EPSC cement shell mould under acid rain erosion

针对水泥聚苯模壳在抵抗酸侵蚀方面研究的不足,对水泥聚苯模壳在不同的模拟酸侵蚀环境下的立方体抗压强度及线膨胀系数进行大量基础性试验研究.阐明不同的PH值的酸雨侵蚀溶液及不同侵蚀龄期对水泥聚苯模壳抗压强度及线膨胀系数的影响.试验结果表明:随着侵蚀龄期的增加,不同pH值侵蚀溶液中侵泡的试块抗压强度及线膨胀系数的变化趋势相同,水泥聚苯模壳立方体试件的抗压强度变化趋势是先增大后减小,线膨胀系数的变化趋势是先减小后增大,当侵蚀龄期在14~21 d时,PH为3的侵蚀溶液中侵泡的试块抗压强度达到峰值的同时,线膨胀系数最小;随着侵蚀的进一步进行,试块抗压拉强度开始降低,线膨胀系数逐步增大,至49 d时,只有PH为5的侵蚀溶液中侵泡的立方体试块抗压强度满足规范要求,其余试块强度均小于规范要求的0.4 MPa.

The cubic compressive strength and linear expansion coefficient of the concrete in different simulated acid erosion environment were studied by a large number of basic experiments in view of the deficiency of the research on the resistance to acid erosion of the cement polystyrene mould. The effects of different pH value of acid rain on the compressive strength and linear expansion coefficient of the cement eps are explained. Experimental results show that with the increase of erosion age, the compressive strength and linear expansion coefficient in different pH value erosion block are the same change trend. The change trend of compressive strength of the cube specimen of EPSC cement shell mould is firstly increased and then decreased, and change trend of linear expansion coefficient is firstly decreased and then increased. When the age of erosion is 14 d ~ 21 d, the compressive strength of the specimens in the eroded solution of pH as 3 reaches the peak value, and linear expansion coefficient reaches to a minimum; With the further development of erosion, the compressive strength of the specimens begins to decrease, the linear expansion coefficient gradually increases; When to 49 d, only the compressive strength of cubic specimen with pH as 5 erosion solution meet the specification requirements, the rest of the test block strength is less than the standard requirements of the 0.4 MPa.