电石渣激发矿渣-粉煤灰复合胶凝材料的作用机制

硅酸盐通报 ›› 2023, Vol. 42 ›› Issue (4): 1333-1343.

所属专题：资源综合利用

电石渣激发矿渣-粉煤灰复合胶凝材料的作用机制

安赛^1,2, 王宝民¹, 陈文秀³, 赵庆新⁴

1.大连理工大学建设工程学部,大连 116024;
2.河北科技师范学院城市建设学院,秦皇岛 066004;
3.秦皇岛市质量技术监督检验所,秦皇岛 066004;
4.燕山大学,河北省土木工程绿色建造与智能运维重点实验室,秦皇岛 066004

收稿日期:2023-01-05 修订日期:2023-02-08 出版日期:2023-04-15 发布日期:2023-04-25
通信作者: 王宝民,博士,教授。E-mail:wangbm@dlut.edu.cn
作者简介:安赛(1992—),男,博士研究生。主要从事工业废弃物综合利用的研究。E-mail:aseagle@mail.dlut.edu.cn
基金资助:
国家自然科学基金联合基金重点项目(U20A20324);国家自然科学基金(52272016);大连市科技创新基金应用基础研究(2020JJ26SN060);河北省科技厅科技计划(22557674D)

Interaction Mechanism of Carbide Slag Activating Slag-Fly Ash Composite Cementitious Materials

AN Sai^1,2, WANG Baomin¹, CHEN Wenxiu³, ZHAO Qingxin⁴

1. Faculty of Infrastructure Engineering, Dalian University of Technology, Dalian 116024, China;
2. College of Urban Construction, Hebei Normal University of Science and Technology, Qinhuangdao 066004, China;
3. Qinhuangdao Quality and Technology Supervision and Inspection Institute, Qinhuangdao 066004, China;
4. Key Laboratory of Green Construction and Intelligent Maintenance for Civil Engineering of Hebei Province, Qinhuangdao 066004, China

Received:2023-01-05 Revised:2023-02-08 Online:2023-04-15 Published:2023-04-25

摘要/Abstract

摘要： 为探究矿渣、粉煤灰及电石渣的资源化利用,以电石渣作为碱激发剂,研究了矿渣-粉煤灰复合胶凝材料的水化产物组成及强度特征。采用X射线衍射(XRD)、傅里叶变换红外光谱(FTIR)、热重-差示扫描热(TG-DSC)、扫描电子显微镜及能谱(SEM-EDS)等微观测试技术,分析了复合胶凝材料的晶体结构、热化学性质以及微观形貌等特性,研究了电石渣激发矿渣-粉煤灰复合胶凝材料的作用机制。结果表明:电石渣作为碱激发剂时能为矿渣-粉煤灰复合胶凝材料提供初始水化所需要的强碱环境,驱动矿渣和粉煤灰发生水化反应。随着矿渣掺量的增加,复合胶凝材料的强度发展呈先增加后减小的变化趋势,在粉煤灰与矿渣掺量质量配比为4∶6、外掺电石渣质量分数为4%时,复合材料浆体经4 d常温养护+32 h高温蒸汽养护后抗压强度达到25.9 MPa;矿渣-粉煤灰复合胶凝体系中水化产物分布不均,主要组成为水化硅酸钙、水化铝酸钙、水化硅铝酸钙等凝胶。电石渣作为矿渣-粉煤灰体系的碱激发剂使用时效果良好。

关键词: 电石渣, 矿渣, 粉煤灰, 碱激发, 胶凝材料, 微观组成, 作用机制

Abstract: In order to study the resource utilization of slag, fly ash and carbide slag, the hydration product composition and strength characteristics of slag-fly ash composite cementitious materials were studied with carbide slag as alkali activator. The crystal structure, thermochemical properties and microscopic morphology of the composite cementitious materials were analyzed by X-ray diffraction (XRD), fourier transform infrared spectroscopy (FTIR), thermogravimetric-differential scanning calorimetry (TG-DSC), scanning electronic microscopy-energy dispersive spectroscopy (SEM-EDS), and the interaction mechanism of carbide slag activating slag-fly ash composite cementitious materials was studied. The results show that carbide slag as alkali activator provides a strong alkaline environment for the initial hydration of slag-fly ash composite cementitious materials, and it can also drive the hydration reaction of slag and fly ash. With the increase of slag content, the strength of composite cementitious materials increases first and then decreases. When the mass proportion of fly ash and slag is 4∶6, and the mass addition of carbide slag is 4%, the compressive strength of composite slurry reaches 25.9 MPa under the conditions of 4 d normal temperature curing and 32 h high temperature steam curing. The hydration products of the slag-fly ash composite cementitious system are unevenly distributed, containing C-S-H, C-A-H, C-A-S-H gel and etc. Carbide slag has a good effect as alkali activator in slag-fly ash system.

Key words: carbide slag, slag, fly ash, alkali excitation, cementitious material, micro composition, interaction mechanism

中图分类号:

TU526

安赛, 王宝民, 陈文秀, 赵庆新. 电石渣激发矿渣-粉煤灰复合胶凝材料的作用机制[J]. 硅酸盐通报, 2023, 42(4): 1333-1343.

AN Sai, WANG Baomin, CHEN Wenxiu, ZHAO Qingxin. Interaction Mechanism of Carbide Slag Activating Slag-Fly Ash Composite Cementitious Materials[J]. BULLETIN OF THE CHINESE CERAMIC SOCIETY, 2023, 42(4): 1333-1343.

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电石渣激发矿渣-粉煤灰复合胶凝材料的作用机制

Interaction Mechanism of Carbide Slag Activating Slag-Fly Ash Composite Cementitious Materials

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