Abstract

In this article, the strength characteristics of the cement mortar with waste glass powder of different size and content at different ages were studied. The mechanism of strength development was analysed from the microstructure of mortar specimens based on scanning electron microscopy (SEM) and electronic dispersive spectroscopy (EDS). The results show that the compressive strength and flexural strength of the mortar specimens increase significantly with a higher age. There is an optimal content of glass powder corresponding to the maximum strength. The glass powder of smaller particle size clearly promotes the development of compressive strength and flexural strength in the mortar specimens. It is found from SEM-EDS that glass cement mortar has a larger amount of internal hydration products and higher density compared with ordinary cement mortar. The density of cement mortar incorporating 15 wt% glass powder increases gradually with the decrease of glass particle size. The hydration products and compactness of the cement mortar adding 200–500 mesh glass powder experience an increase and then a decrease with a rise in the glass content. The strength enhancement with the addition of glass powder are mainly attributed to the microaggregate filling effect and pozzolanic effect of the glass powder, as well as to changes in the interfacial transition zone.

摘要

本文研究了不同粒径和含量的废玻璃粉水泥砂浆在不同年龄的强度特性。基于扫描电子显微镜（SEM）和电子色散光谱（EDS）从砂浆试样的微观结构分析强度发展的机制。结果表明，砂浆试件的抗压强度和抗弯强度随着年龄的增加而显着增加。存在对应于最大强度的最佳玻璃粉含量。较小粒径的玻璃粉明显促进砂浆试样的抗压强度和抗弯强度的发展。SEM-EDS发现，玻璃水泥砂浆与普通水泥砂浆相比，内部水化产物量更大，密度更高。掺入15 wt%玻璃粉的水泥砂浆的密度随着玻璃粒径的减小而逐渐增加。添加200-500目玻璃粉的水泥砂浆的水化产物和密实度随着玻璃含量的增加先增加后减少。加入玻璃粉后强度的提高主要归因于玻璃粉的微集料填充效应和火山灰效应，以及界面过渡区的变化。