碳化镁渣基预置轻骨料混凝土的制备与性能研究

doi:10.16552/j.cnki.issn1001-1625.2024.1164

硅酸盐通报 ›› 2025, Vol. 44 ›› Issue (4): 1377-1385.DOI: 10.16552/j.cnki.issn1001-1625.2024.1164

碳化镁渣基预置轻骨料混凝土的制备与性能研究

刘胜源^1,2, 王健涛^1,2, 张文芹¹, 刘云鹏¹

1.武汉理工大学硅酸盐建筑材料国家重点实验室,武汉 430070;
2.武汉理工大学材料科学与工程学院,武汉 430070

收稿日期:2024-09-30 修订日期:2024-11-19 出版日期:2025-04-15 发布日期:2025-04-18
通信作者: 张文芹,博士,副研究员。E-mail:wqzhang@whut.edu.cn
作者简介:刘胜源(1999—),男,硕士研究生。主要从事低碳建筑材料的研究。E-mail:331021@Whut.edu.cn
基金资助:
国家自然科学基金(52130208)

Preparation and Properties of Magnesium Carbide Slag Based Preplaced Lightweight Aggregate Concrete

LIU Shengyuan^1,2, WANG Jiantao^1,2, ZHANG Wenqin¹, LIU Yunpeng¹

1. State Key Laboratory of Silicate Materials for Architectures, Wuhan University of Technology, Wuhan 430070, China;
2. School of Materials Science and Engineering, Wuhan University of Technology, Wuhan 430070, China

Received:2024-09-30 Revised:2024-11-19 Published:2025-04-15 Online:2025-04-18

摘要/Abstract

摘要： 镁渣是镁冶炼过程中产生的固体废弃物,具有低水化活性和高碳化活性。通过配合比优化,本文成功调配出具备大流动度和高稳定性的镁渣浆体,并以镁渣浆体作为灌浆材料制备了一种碳化预置轻骨料混凝土,系统研究了碳化养护对轻骨料混凝土力学性能和微观结构的影响。结果表明,镁渣浆体的流动度达到245 mm,满足预制混凝土灌浆的技术要求。经过干燥预处理和24 h碳化养护后,试样的抗压强度为24.5 MPa,固碳量为100 kg/m³。碳化反应生成的CaCO₃晶体以球霰石为主,少量为文石,碳化产物填充基体是碳化预置轻骨料混凝土强度提升的关键机制。

关键词: 镁渣浆体, 预置轻骨料混凝土, 流动度, 碳化养护, 碳化产物

Abstract: Magnesium slag is a solid waste produced in the process of magnesium smelting, which has low hydration activity and high carbonation activity. Through the optimization of mix proportion, magnesium slag slurry with high fluidity and high stability was successfully prepared in this paper, and a carbonized preplaced lightweight aggregate concrete was prepared by using magnesium slag slurry as grouting material. And the effect of carbonation curing on the mechanical properties and microstructure of lightweight aggregate concrete was systematically studied. The results show that the fluidity of magnesium slag slurry reaches 245 mm, which meets the technical requirements of precast concrete grouting. After drying pretreatment and 24 h carbonation curing, the compressive strength of sample reaches 24.5 MPa, and the carbon sequestration reaches 100 kg/m³. The CaCO₃ crystal formed by the carbonation reaction is mainly vaterite, and a small amount is aragonite. The filling of matrix by carbonation product is the key mechanism for the strength improvement of carbonized preplaced lightweight aggregate concrete.

Key words: magnesium slag slurry, preplaced lightweight aggregate concrete, fluidity, carbonation curing, carbonation product

中图分类号:

TU528

刘胜源, 王健涛, 张文芹, 刘云鹏. 碳化镁渣基预置轻骨料混凝土的制备与性能研究[J]. 硅酸盐通报, 2025, 44(4): 1377-1385.

LIU Shengyuan, WANG Jiantao, ZHANG Wenqin, LIU Yunpeng. Preparation and Properties of Magnesium Carbide Slag Based Preplaced Lightweight Aggregate Concrete[J]. BULLETIN OF THE CHINESE CERAMIC SOCIETY, 2025, 44(4): 1377-1385.

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碳化镁渣基预置轻骨料混凝土的制备与性能研究

Preparation and Properties of Magnesium Carbide Slag Based Preplaced Lightweight Aggregate Concrete

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