The effects of different contents and particle sizes of waste glass powder on alkali–silica reaction (ASR) expansion of cementitious composite bar were investigated in this study. Waste glass powder with particle size less than 300 μm exhibits an excellent mitigation effect on ASR expansion. With larger content and smaller particle size, the mitigation effect of waste glass powder on ASR expansion gradually increases. The mitigation effect of waste glass powder with particle size ranging from 38 to 53 μm and 20% by weight of cement seems relatively better than that of fly ash. When the waste glass powder content reaches 30%, the mitigation effect is still effective and almost the same as that of fly ash. However, the waste glass powder with particle size larger than 300 μm presents negative mitigation effect on ASR expansion when the replacement rate is larger than 30%. On the other hand, the waste glass powder and calcium hydroxide (CH) further react, and produce more calcium–silicate–hydrate gels, which apparently reduce the amount of CH. Moreover, the increasing content of waste glass powder results in a lower pH value in the pore solution of cementitious composite.

中文翻译：

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废玻璃粉对水泥基复合材料中碱-二氧化硅反应（ASR）膨胀的缓解作用

本研究研究了不同含量和粒径的废玻璃粉对水泥基复合材料棒碱-二氧化硅反应（ASR）膨胀的影响。粒径小于 300 μm 的废玻璃粉对 ASR 膨胀有很好的缓解作用。随着含量的增加和粒径的减小，废玻璃粉对ASR膨胀的减缓作用逐渐增强。粒径为38～53μm、水泥重量为20%的废玻璃粉的缓蚀效果似乎比粉煤灰的缓蚀效果要好。当废玻璃粉含量达到30%时，缓解效果仍然有效，几乎与粉煤灰相同。然而，当置换率大于30%时，粒径大于300 μm的废玻璃粉对ASR膨胀有负面减缓作用。另一方面，废玻璃粉与氢氧化钙（CH）进一步反应，产生更多的硅酸钙水合物凝胶，这明显减少了CH的量。此外，随着废玻璃粉含量的增加，水泥基复合材料孔隙溶液中的pH值降低。