废玻璃粉混凝土的碳化特征

Carbonization characteristics of concrete with waste glass powder

为研究废玻璃粉混凝土抗碳化性能,将粒径不超过75μm的无色废玻璃粉分别以10%、20%、30%与粉煤灰20%的掺量等质量代替水泥制作100 mm×100 mm×400 mm的混凝土棱柱体试块。分别标养3、28、56 d后,采用加速碳化试验法进行碳化试验,然后用酚酞溶液滴定法测定试件的碳化深度,并通过热重-差热分析、压汞法分别测定混凝土养护56 d后的碳化程度与孔隙率。结果表明,当养护时间较短时,废玻璃混凝土的抗碳化性能随废玻璃粉掺量的增加而下降;随着养护时间增长,混凝土中废玻璃粉火山灰效应显著,掺量10%的废玻璃混凝土在标养56d后抗碳化性能与基准组相当。

To study the carbonation resistance of glass power concrete,the colorless waste glass power,the average size of which was not lager than 75 μm,was used as a partial replacement for cement at 10%,20%,30%,as well as the fly ash at 20%,to cast concrete blocks（100 mm×100 mm×100 mm）.Cured in standard condition to 3,28,56 d,the blocks was tested in carbonization experiment using the accelerated carbonation experiment method.The carbonation depth was assayed by titration method using the phenolphthalein solution.The degree of carbonization and porosity of the concrete cured to 56 d were analysed by TG-DSC and the mercury intrusion method respectively.The result shows that the carbonation resistance of glass power concrete decrease with the increase of waste glass power when cured to 3 d.The pozzolanic effect of waste glass power is significant when cured adequately and the carbonation resistance of concrete with 10% glass power is similar to that of the reference group after curing 56 d.