CO2矿化改性高钙粉煤灰对水泥砂浆力学性能和微结构的影响

硅酸盐通报 ›› 2024, Vol. 43 ›› Issue (5): 1889-1896.

所属专题：资源综合利用

CO₂矿化改性高钙粉煤灰对水泥砂浆力学性能和微结构的影响

黄煌煌^1,2, 陈铁锋^3,4, 高小建^3,4

1.湖北隆中实验室,襄阳 441000;
2.武汉理工大学材料科学与工程学院,武汉 430070;
3.哈尔滨工业大学土木工程学院,哈尔滨 150090;
4.哈尔滨工业大学结构工程灾变与控制教育部重点实验室,哈尔滨 150090

收稿日期:2023-10-25 修订日期:2023-12-21 出版日期:2024-05-15 发布日期:2024-06-06
通信作者: 陈铁锋,博士,讲师。E-mail:chentf@hit.edu.cn
作者简介:黄煌煌(1994—),男,博士。主要从事低碳胶凝材料、超高性能混凝土等方面的研究。E-mail:hhhuang@whut.edu.cn
基金资助:
湖北隆中实验室自主创新研究项目(2022ZZ-37);宁波市重点研发计划(2023Z101);黑龙江省自然科学基金(LH2023E120)

Effect of CO₂-Mineralized High-Calcium Fly Ash on Mechanical Properties and Micro-Structure of Cement Mortar

HUANG Huanghuang^1,2, CHEN Tiefeng^3,4, GAO Xiaojian^3,4

1. Hubei Longzhong Laboratory, Xiangyang 441000, China;
2. School of Materials Science and Engineering, Wuhan University of Technology, Wuhan 430070, China;
3. School of Civil Engineering, Harbin Institute of Technology, Harbin 150090, China;
4. Key Lab of Structures Dynamic Behavior and Control of the Ministry of Education, Harbin Institute of Technology, Harbin 150090, China

Received:2023-10-25 Revised:2023-12-21 Online:2024-05-15 Published:2024-06-06

摘要/Abstract

摘要： 为改善高钙粉煤灰在混凝土中的体积安定性和水化活性,本文对高钙粉煤灰进行了CO₂矿化改性,研究了不同CO₂矿化反应时长下高钙粉煤灰的固碳量和游离氧化钙含量,及CO₂矿化改性高钙粉煤灰对水泥砂浆水化热、力学性能和孔隙结构的影响。结果表明,经12 h CO₂矿化改性处理,高钙粉煤灰固碳量可超过10%(质量分数),高钙粉煤灰中的游离氧化钙含量明显降低。随着矿化反应时间的延长,掺高钙粉煤灰的水泥浆体水化诱导期缩短,早期水化放热量明显降低。CO₂矿化改性处理还能减轻高钙粉煤灰对水泥砂浆强度的负面影响,改善水泥砂浆孔隙结构,降低孔隙率和大孔含量,促进水泥的早期水化和水化硅酸钙的成核结晶。

关键词: 高钙粉煤灰, CO₂矿化, 力学性能, 孔结构, 游离氧化钙, 水泥砂浆

Abstract: To improve the volume stability and hydration activity of high-calcium fly ash (HFA), CO₂ mineralization treatment was applied in this paper. The CO₂ uptake percentage and free CaO content of HFA undergone different CO₂ mineralization duration were experimentally determined. The influence of CO₂-mineralized HFA on hydration heat, mechanical properties and pore structure of cement mortar was investigated. The results show that after 12 h of CO₂ mineralization modification treatment, the carbon sequestration of high calcium fly ash exceeds 10% (mass fraction), and the content of free calcium oxide in high calcium fly ash is significantly reduced. As the prolongation of CO₂mineralization, the hydration induction period of cement slurry mixed with HFA is shortened, and the early hydration heat release is significantly reduced. CO₂ mineralization can also mitigate the adverse impacts of HFA on mechanical strength, as well as improving the pore structure of cement mortar by reducing porosity and volume fraction of large capillary pores. Besides, CO₂-mineralized HFA provides more nucleation sites for precipitation of C-S-H, accelerating the early hydration reaction of cement paste.

Key words: high-calcium fly ash, CO₂ mineralization, mechanical property, pore structure, free CaO, cement mortar

中图分类号:

TU528

黄煌煌, 陈铁锋, 高小建. CO₂矿化改性高钙粉煤灰对水泥砂浆力学性能和微结构的影响[J]. 硅酸盐通报, 2024, 43(5): 1889-1896.

HUANG Huanghuang, CHEN Tiefeng, GAO Xiaojian. Effect of CO₂-Mineralized High-Calcium Fly Ash on Mechanical Properties and Micro-Structure of Cement Mortar[J]. BULLETIN OF THE CHINESE CERAMIC SOCIETY, 2024, 43(5): 1889-1896.

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CO₂矿化改性高钙粉煤灰对水泥砂浆力学性能和微结构的影响

Effect of CO₂-Mineralized High-Calcium Fly Ash on Mechanical Properties and Micro-Structure of Cement Mortar

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