碱激发矿渣-玻璃粉基泡沫混凝土性能研究

摘要/Abstract

摘要： 采用玻璃粉部分替代矿渣制备碱激发胶凝材料,研究了玻璃粉含量(10%、20%、30%、40%,质量分数)对碱激发矿渣-玻璃粉基(AASG)泡沫混凝土性能的影响。对AASG泡沫混凝土流动性、抗压强度、干燥收缩、吸水率、软化系数和抗冻性进行了研究,并通过扫描电子显微镜和X射线衍射仪对机理进行了分析。结果表明:10%~40%掺量的玻璃粉使AASG泡沫混凝土的流动性提高了5.0%~25.6%;抗压强度随玻璃粉掺量的增加先增大再减小,玻璃粉掺量为20%时,7 d和28 d抗压强度最高,与对照组相比分别提高15.0%和23.8%;玻璃粉掺量为20%时,AASG泡沫混凝土的干燥收缩、吸水率、软化系数和抗冻性最佳;SEM分析发现,玻璃粉有助于孔结构的优化和提高微观结构的致密性;XRD分析表明,AASG泡沫混凝土的主要反应产物为 C-(N-)A-S-H和水滑石。将玻璃粉作为矿渣的替代品来制备AASG泡沫混凝土是可行的,为其在回填工程和固废利用提供理论支撑。

关键词: 碱激发泡沫混凝土, 玻璃粉, 抗压强度, 干燥收缩, 软化系数, 抗冻性

Abstract: In order to utilize glass powder as a partial replacement of slag to prepare the alkali-activated slag cementitious material, the effect of glass powder content (10%, 20%, 30%, 40%, mass fraction) on the properties of alkali-activated slag-glass powder based (AASG) foamed concrete was studied. The fluidity, compressive strength, drying shrinkage, water absorption, softening coefficient and frost resistance of AASG foamed concrete were tested, and the mechanism was analyzed by scanning electron microscope and X-ray diffractometer. The results show that the use of 10% to 40% glass powder increases the fluidity of AASG foamed concrete by 5.0% to 25.6%. The compressive strength increases first and then decreases with the increase of glass powder content. The 7 d and 28 d compressive strength reach the peak when 20% glass powder is used, increasing by 15.0% and 23.8% compared with the control group respectively. When 20% glass powder is used, the drying shrinkage, water absorption, softening coefficient and frost resistance of AASG foamed concrete are the best. SEM analysis shows that glass powder contributes to the optimization of pore structure and compactness of microstructure. XRD analysis indicates that the main hydration products are C-(N-)A-S-H and hydrotalcite. Therefore, the inclusion of glass powder in AASG foamed concrete as a replacement for slag is feasible, which provides theoretical support for its application in backfill engineering and solid waste utilization.

Key words: alkali-activated foamed concrete, glass powder, compressive strength, dry shrinkage, soften coefficient, frost resistance

中图分类号:

TU528.2

龚建清, 杨倩, 郭丽, 范苏杰, 蔡光伟. 碱激发矿渣-玻璃粉基泡沫混凝土性能研究[J]. 硅酸盐通报, 2022, 41(1): 226-234.

GONG Jianqing, YANG Qian, GUO Li, FAN Sujie, CAI Guangwei. Performance of Alkali-Activated Slag-Glass Powder Based Foamed Concrete[J]. BULLETIN OF THE CHINESE CERAMIC SOCIETY, 2022, 41(1): 226-234.

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