利用废氢氧化钙和回收玻璃粉制备火山灰材料

IF 0.2 Q4 MULTIDISCIPLINARY SCIENCES Suranaree Journal of Science and Technology Pub Date : 2023-05-29 DOI:10.55766/sujst-2023-02-e02019
Chiraporn Auechalitanukul, P. Jornsanoh, R. McCuiston, Jinjutha Sooksamran, Sukrita Leecharoen, Chonnipa Withaisong
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引用次数: 0

摘要

使用消费和工业废料作为补充胶凝材料是发展可持续波特兰水泥的一种解决方案。本文研究了用再生钠石灰玻璃粉(GP)和废氢氧化钙(CH)组成的火山灰混合物部分替代水泥。通过热重分析和x射线衍射,从30/70 ~ 70/30 (CH/GP)的5个比值中选择CH和GP的最佳质量比。发现缺CH比中含有残留的玻璃粉,富CH比中含有残留的氢氧化钙,存在CH的不良碳化现象。由于形成了大量的水化硅酸钙(C-S-H)凝胶,因此选择了60/40的火山灰。用60/40的火山灰替代20 - 40% wt.%的硅酸盐水泥(PC)试样,在3 - 28天的老化时间内进行孔隙率和抗压强度的表征。含有20 - 40 wt.%火山灰的PC由于从批次中增加了未反应水的量而略微增加了孔隙度。随着时效时间的延长,孔隙率降低。含有30wt .%火山灰的PC具有与参考PC相同的抗压强度,但仅经过7天或更长时间的老化。这可能是由于火山灰的反应速度较慢。60/40 CH/GP火山灰似乎是一个可行的部分替代PC当使用30 wt.%。
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CREATION OF A POZZOLANIC MATERIAL FROM WASTE CALCIUM HYDROXIDE AND RECYCLED GLASS POWDER
The use of consumer and industrial waste as supplementary cementitious materials is one solution to the development of sustainable Portland cement. This research studied the partial replacement of cement with a pozzolanic mixture of recycled soda-lime glass powder (GP) and waste calcium hydroxide (CH). The optimal weight ratio of CH and GP was selected from five ratios between 30/70 to 70/30 (CH/GP), using thermal gravimetric analysis and X-ray diffraction. It was found that CH deficient ratios contained residual glass powder, while CH rich ratios contained residual calcium hydroxide and had undesirable carbonation of the CH. The 60/40 pozzolan was selected due to the large amount of calcium silicate hydrate (C-S-H) gel that was formed, the absence of residual GP and a minimum of excess CH. Portland cement (PC) specimens with 20 to 40 wt.% replacement by the 60/40 pozzolan were characterized for porosity and compressive strength at aging times from 3 to 28 days. The PC with 20 to 40 wt.% pozzolan had slightly increased porosity due to an increased amount of unreacted water from the batch. The porosity decreased with increased aging time. The PC with 30 wt.% pozzolan had a compressive strength equal to the reference PC, but only after 7 days or longer of aging. This was likely due to the slower reaction rate of the pozzolan. The 60/40 CH/GP pozzolan appears to be a viable partial replacement for PC when used at 30 wt.%.
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来源期刊
Suranaree Journal of Science and Technology
Suranaree Journal of Science and Technology MULTIDISCIPLINARY SCIENCES-
CiteScore
0.30
自引率
50.00%
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0
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