玻璃粉掺量对石灰石粉混凝土干燥收缩的影响

Effect of Glass Powder Content on Drying Shrinkage of Concrete with Limestone Powder

测试了不同龄期石灰石粉混凝土的干燥收缩和失水量,研究了玻璃粉掺量对其干燥收缩性能的影响。结果表明,掺加10%和20%玻璃粉可有效降低石灰石粉混凝土的干燥收缩,以10%掺量最佳,继续增加玻璃粉掺量反而增加了干燥收缩。扫描电镜(SEM)结果表明,良好的保水性和致密的内部结构,能够增强混凝土抵抗干燥收缩的能力,阻碍其内部水分迁移渗出,从而降低干燥收缩。

The drying shrinkage and water loss of concrete with limestone powder at different ages were tested to study the effect of glass powder with different contents on its drying shrinkage performance.The results show that the utilization of 10%and 20%glass powder reduces drying shrinkage of concrete with limestone powder,and the best content is 10%,however,with the further increase of glass powder content,the drying shrinkage of concrete is increased.Scanning electron microscopy(SEM)results show that the good water retention and dense internal structure of concrete can enhance the ability of concrete to resist drying shrinkage and hinder the migration and exudation of internal moisture,thus reducing drying shrinkage.