废玻璃粉作为辅助胶凝材料对砂浆性能影响及作用机理

摘要/Abstract

摘要： 作为辅助胶凝材料掺入混凝土是废弃玻璃回收利用的途径之一。研究废玻璃粉掺料对砂浆性能影响及作用机理,结果可为该类应用提供指导。本文研究0~0.075 mm、0.075~0.15 mm和0.15~0.3 mm这三组不同粒径废玻璃粉作为辅助胶凝材料对砂浆力学性能及碱硅酸反应(ASR)膨胀作用的影响。研究发现:掺入玻璃粉粒径为0~0.075 mm可将砂浆28 d抗压强度增加5%~15%,ASR膨胀率减小20.2%;掺入玻璃粉粒径为0.15~0.3 mm则使砂浆28 d抗压强度降低5%~8%,ASR膨胀率增加39.7%。采用热重分析、等离子电感耦合、扫描电镜及能谱分析试验对反应产物、孔溶液、微观结构及其元素分布进行检测。分析认为粒径粗的玻璃粉碱骨料活性强,易发生ASR,导致膨胀率增加;粒径细的火山灰活性强,发生火山灰反应生成了膨胀率低的低钙硅比水化硅酸钙凝胶,该产物不仅会吸收Na⁺、K⁺,从而减少用于发生ASR的反应物含量,而且更密实,有利于降低孔隙率,减少水的渗透,提高抗压强度并抵抗膨胀压。

关键词: 废玻璃, 火山灰反应, 碱硅酸反应, 辅助胶凝材料, 资源再利用

Abstract: Incorporating waste glass powder (WGP) into concrete as supplementary cementitious materials (SCMs) offers a potential method for recycling glass. To facilitate the effective application, it is necessary to research the effect and mechanism of waste glass on mortar properties. In this paper, the effect of WGP with different particle sizes of 0~0.075 mm, 0.075~0.15 mm and 0.15~0.3 mm as SCMs on the mechanical properties of mortar and expansion of alkali-silica reaction (ASR) was studied. The results show that the 28 d compressive strength of mortar increases by 5%~15% and ASR expansion rate decreases by 20.2% when the size of WGP is 0~0.075 mm. The 28 d compressive strength of mortar decreases by 5%~8% and the ASR expansion rate increases by 39.7% when the size of WGP is 0.15~0.3 mm. To further explore the mechanism of performance change, thermogravimetric analysis, inductively coupled plasma and electron microscope and energy dispersive spectrometer were used to examine the resulting products, pore solution, microstructure and composition. The alkali aggregate activity of coarse WGP is strong, easy to ASR, resulting in ASR expansion rate increased. The pozzolanic reactivity of fine WGP is strong, the pozzolanic reaction produces calcium silicate hydrate gel with a low Ca/Si ratio and a low expansion rate. The product absorbs Na⁺ and K⁺, reducing the number of reactants needed for ASR, and the resulting mortar is denser than the plain mortar, which is beneficial for reducing porosity, reducing water infiltration, and resisting expansion pressure.

Key words: waste glass, pozzolanic reaction, alkali-silica reaction, supplementary cementitious material, recycling resource

中图分类号:

TU528.041

李方, 杨健, 李粒珲. 废玻璃粉作为辅助胶凝材料对砂浆性能影响及作用机理[J]. 硅酸盐通报, 2022, 41(9): 3208-3218.

LI Fang, YANG Jian, LI Lihui. Effect and Mechanism of Waste Glass Powder as Supplementary Cementitious Material on Mortar Properties[J]. BULLETIN OF THE CHINESE CERAMIC SOCIETY, 2022, 41(9): 3208-3218.

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