玻璃再生混凝土抗压强度及收缩性能试验研究

Experimental Study on Compressive Strength and Shrinkage Performance of Glass Recycled Concrete

文中测试了不同玻璃粉掺量再生混凝土试件的坍落度、抗压强度和干燥收缩,并结合SEM测试分析其微观结构,研究玻璃粉对再生混凝土性能的影响。研究发现,掺杂玻璃粉能有效改善混凝土的工作性能,且与玻璃粉掺量成正比;掺杂玻璃粉会降低混凝土早期强度,但随着养护龄期的延长,该负面影响逐渐减弱,90 d时,玻璃粉掺量为15%的混凝土试件强度高于基准组混凝土,超过1.63%;玻璃粉的掺入能有效降低混凝土干燥收缩变形值,180 d时,25%玻璃粉掺量的混凝土试件干缩率降低42.92%。综合评估确定,15%为玻璃粉最佳掺量。

In this paper,the effects of glass powder on the properties of recycled concrete were studied by testing the slump,compressive strength and dry shrinkage of recycled concrete specimens with different glass powder content,and analyzing their microstructure by SEM.It is found that doped glass powder can effectively improve the working performance of concrete,and it is proportional to the glass powder content.Doped glass powder can reduce the early strength of concrete,but with the increase of curing age,this negative effect gradually weakens.At 90d,the strength of concrete specimens with 15%glass powder content is slightly higher than that of the base group,exceeding 1.63%;The doping of glass powder can effectively reduce the dry shrinkage deformation value of concrete.At 180d,the dry shrinkage rate of concrete samples with 25%glass powder content is reduced by 42.92%.After comprehensive evaluation,15%is determined to be the best dosage of glass powder.