碱激发偏高岭土-矿渣砂浆的碱骨料反应机理研究

硅酸盐通报 ›› 2023, Vol. 42 ›› Issue (8): 2830-2836.

碱激发偏高岭土-矿渣砂浆的碱骨料反应机理研究

罗哲¹, 黄敦文^1,2, 彭晖¹

1.长沙理工大学土木工程学院,长沙 410114;
2.南方地区桥梁长期性能提升技术国家地方联合工程实验室,长沙 410114

收稿日期:2023-04-08 修订日期:2023-06-01 发布日期:2023-08-18
通信作者: 黄敦文,博士,讲师。E-mail:dw.huang@csust.edu.cn
彭晖,博士,教授。E-mail:huipeng@csust.edu.cn
作者简介:罗哲(1998—),男,硕士研究生。主要从事碱激发胶凝材料耐久性能的研究。E-mail:2593853824@qq.com
基金资助:
国家自然科学基金(51878068,52008036);湖南省自然科学基金(2021JJ40581);湖南省教育厅优秀青年项目(22B0344);交通基础设施安全风险管理交通运输行业重点实验室(长沙)开放基金(22KF02)

Alkali-Aggregate Reaction Mechanism of Alkali-Activated Metakaolin-Slag Mortar

LUO Zhe¹, HUANG Dunwen^1,2, PENG Hui¹

1. School of Civil Engineering, Changsha University of Science and Technology, Changsha 410114, China;
2. National-Local Joint Engineering Laboratory of Technology for Long-Term Performance Enhancement of Bridges in Southern District, Changsha 410114, China

Received:2023-04-08 Revised:2023-06-01 Published:2023-08-18

摘要/Abstract

摘要： 碱激发胶凝材料是一种新型低碳材料,其液相环境的碱度普遍高于水泥基材料,势必导致碱骨料反应引起的体积变形不同于水泥基材料。为探究碱激发胶凝材料的碱骨料反应行为与液相碱度的关系,选取花岗岩为代表性骨料制备碱激发偏高岭土-矿渣砂浆,研究在不同浓度NaOH溶液浸泡下的砂浆变形行为。结合微观分析表明,碱激发胶凝材料的体积收缩能很好地抑制碱骨料反应产生的膨胀,不同浸泡条件下碱激发偏高岭土-矿渣砂浆会呈现不同的变形行为。碱激发偏高岭土-矿渣砂浆的膨胀是由碱骨料反应生成产物以及原类沸石结构的水化硅铝酸钠凝胶向沸石结构转化所造成的。当碱激发胶凝材料的孔溶液氢氧根离子浓度大于0.209 mol/L时,碱骨料反应会发生。

关键词: 碱激发胶凝材料, 碱骨料反应, 偏高岭土, 矿渣, 变形行为, 液相碱度, 微观结构

Abstract: Alkali-activated cementitious material is a new type of low-carbon material. The pore solution of alkali-activated cementitious materials generally has more alkalinity than cement-based materials, inevitably leading to the different volume deformation caused by alkali-aggregate reaction. Granite was selected as a representative aggregate to prepare alkali-activated metakaolin-slag mortar for exploring the relationship between the alkalinity of pore solution and alkali-aggregate reaction. The deformation behaviors of mortar immersed in the NaOH solution with different concentrations were studied. According to the microstructure analysis, it is shown that the volume shrinkage of alkali-activated cementitious materials can effectively suppress the expansion caused by alkali-aggregate reaction. Under different soaking conditions, the alkali-activated metakaolin-slag mortar exhibits different deformation behaviors. The expansion behavior of alkali-activated metakaolin-slag mortar is caused by the alkali-aggregate reaction products and the transformation from a zeolite-like structure sodium silicaluminate hydrate gel to a zeolite structure gel. Alkali-aggregate reaction would occur when the hydroxyl ion concentration in the pore solution of alkali-activated cementitious materials is greater than 0.209 mol/L.

Key words: alkali-activated cementitious material, alkali-aggregate reaction, metakaolin, slag, deformation behavior, alkalinity in pore solution, microstructure

中图分类号:

TQ177

罗哲, 黄敦文, 彭晖. 碱激发偏高岭土-矿渣砂浆的碱骨料反应机理研究[J]. 硅酸盐通报, 2023, 42(8): 2830-2836.

LUO Zhe, HUANG Dunwen, PENG Hui. Alkali-Aggregate Reaction Mechanism of Alkali-Activated Metakaolin-Slag Mortar[J]. BULLETIN OF THE CHINESE CERAMIC SOCIETY, 2023, 42(8): 2830-2836.

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