废弃玻璃磨细成粉料后用作混凝土辅助胶凝材料，不仅可以控制ASR(alkali-silica reaction，碱-硅反应)，而且还能激发其火山灰活性。采用砂浆棒快速法，将玻璃粉代替标准砂用作骨料，研究各种骨料替代率条件下的砂浆棒ASR膨胀率大小。掺量为50%时，14 d ASR膨胀率最大。将玻璃骨料与标准砂以1∶1比例成型试件，探讨各种玻璃粉细度、掺量、养护温度、龄期条件下对砂浆棒ASR反应的抑制效果，粉磨时间越长，砂浆棒膨胀率呈降低趋势，掺入粉磨1h玻璃粉在相同掺量下对砂浆棒膨胀率的抑制效果最明显。养护温度对砂浆棒早期膨胀率起主导作用。
Abstract
Waste glass powder, as a kind of admixture in concrete, can not only restrain alkalisilica reaction (ASR), but also stimulate pozzolanic activity. In association with accelerated mortarbar test (AMBT), the glass powder, rather than the standard sand, is used as aggregate to study the ASR expansion rate of mortar bar under aggregate replacement proportions. We made specimens containing the glass aggregate and standard sand in equal ratios, exploring the inhibitory effect of fineness, content, curing temperature and age on ASR reaction of mortar bar. The results show that , when the blending ratio of glass powder is 50%, the maximum ASR expansion occurs with 14d curing; then, the ASR expansion rate of mortar bars decreases when grinding duration of glass powder increases; meanwhile, glass powder with grinding duration of 1 hour is the best for restraining ASR expansion; finally, curing temperature plays a dominant role in the expansion rate of the mortar bar during early
关键词
玻璃粉 /
ASR /
掺量 /
细度 /
抑制
Key words
glass powder /
ASR /
blending content /
fineness /
restraining
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参考文献
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