玻璃粉对再生混凝土力学性能的影响

摘要/Abstract

摘要： 为了实现城市固体垃圾废玻璃资源化,本文研究了不同掺量(0%、5%、10%和20%,质量分数)玻璃粉(GP)取代水泥对再生混凝土抗压强度、劈拉强度和弹性模量等力学性能的影响,并通过压汞法(MIP)和扫描电子显微镜(SEM)分析了再生混凝土的内部微观结构。研究结果表明,玻璃粉降低了再生混凝土早期的力学性能,但掺入适量的玻璃粉有利于提高再生混凝土后期的力学性能。含10%(质量分数)玻璃粉试样90 d的抗压强度、劈拉强度和弹性模量均高于普通再生混凝土,同时总孔隙率降低19.3%。玻璃粉的二次火山灰活性和微集料填充作用改善了再生混凝土的微观结构。

关键词: 玻璃粉, 再生混凝土, 抗压强度, 劈拉强度, 弹性模量

Abstract: In order to realize the recycling of waste glass, a kind of solid waste in the urban area, this paper studied the mechanical properties such as compressive strength, splitting tensile strength and elastic modulus of recycled concrete with different content (0%, 5%, 10% and 20%, mass fraction) of glass powder (GP) in cement. The internal microstructure of recycled concrete was analyzed by mercury intrusion porosimetry (MIP) and scanning electron microscope (SEM). The results show that glass powder reduces the mechanical properties of recycled concrete in the early stage, but the addition of an appropriate amount of glass powder is beneficial to improve the mechanical properties of recycled concrete in the later stage. The compressive strength, splitting tensile strength and elastic modulus of the sample containing 10% (mass fraction) glass powder at 90 d are higher than that of ordinary recycled concrete, and the total porosity reduceds by 19.3%. The secondary pozzolanic activity of glass powder and the filling effect of micro-aggregates improve the microstructure of recycled concrete.

Key words: glass powder, recycled concrete, compressive strength, splitting tensile strength, elastic modulus

中图分类号:

TU528.01

杨震樱, 周长顺. 玻璃粉对再生混凝土力学性能的影响[J]. 硅酸盐通报, 2020, 39(12): 3874-3880.

YANG Zhenying, ZHOU Changshun. Effect of Glass Powder on Mechanical Properties of Recycled Concrete[J]. BULLETIN OF THE CHINESE CERAMIC SOCIETY, 2020, 39(12): 3874-3880.

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