PDF全文阅读

潘    浩^1,2 , 孙    超^1,2 , 赵    寅^1,2 , 黄    宏^1,2 , 张昊鹏^1,2

 

(1. 南京大地建设  (集团) 股份有限公司 , 南京    210029;

2. 南京大地建设集团有限责任公司 , 南京   210029)

摘  要: 为提高工业固废材料制备地聚合物混凝土的利用率 , 研究了矿渣粉 、白云石粉替代粉煤灰对地聚合物混凝土工作性 、力学性能及耐久性的影响 , 并结合扫描电子显微镜和红外光谱进行微观结构表征 。结果表明 : 掺入矿渣粉 、白云石粉会降低地聚合物坍落度 , 提升其力学与耐久性能 ; 掺矿渣粉的增强效果优于白云石粉 , 掺 20%矿渣粉+20%白云石粉时协同效应最佳 ; 相较纯粉煤灰基准组 , 40%矿渣粉试件 90 d 抗压 、劈裂抗拉强度分别提高了 76. 3%和 108. 8% , 20%矿渣粉+20%白云石粉试件则分别提高了 67. 1%和 116. 3% , 且二者的动弹性模量显著提高 、干燥收缩和氯离子扩散系数显著降低 ; 矿渣粉和白云石粉的微集料填充效应及其参与地聚合反应生成更多 C-A-S-H、C-S-H 凝胶 , 使微观结构更加致密 。研究成果可为地聚合物配合比设计提供依据。

关键词: 地聚合物混凝土 ; 固废材料 ; 力学性能 ; 耐久性能 ; 微观结构

中图分类号: U416. 16      文献标志码: A      文章编号: 1005-8249 (2026) 05-0021-08

DOI:10. 19860/j. cnki. issn1005-8249. 2026. 05. 004

 

PAN Hao^1,2 , SUN Chao^1,2 , ZHAO Yin^1,2 , HUANG Hong^1,2 , ZHANG Haopeng^1,2

(1. Nanjing Dadi Construction (Group) Co. , Ltd. , Nanjing 210029, China;

2. Nanjing Dadi Construction Group Co. , Ltd. , Nanjing 210029, China)

Abstract : To enhance the utilisation rate of industrial solid waste materials in preparing geopolymer concrete, this study investigated the effects of replacing fly ash with slag powder and dolomite powder on the workability, mechanical properties, and durability of geopolymer concrete.  Microstructural characterisation was conducted using scanning electron microscopy and infrared spectroscopy.  Results indicate that incorporating slag powder and dolomite powder reduces the slump of geopolymer concrete while enhancing its mechanical and durability properties. Slag powder exhibits superior reinforcement effects compared to dolomite powder, with the synergistic effect peaking at a 20% slag powder + 20% dolomite powder blend. Compared to the pure fly ash control group, specimens with 40% slag powder exhibited 76. 3% and 108. 8% increases in 90-day compressive and splitting tensile strength, respectively.  while specimens with 20% slag powder + 20% dolomite powder showed increases of 67. 1% and 116. 3% , respectively.  Both formulations exhibited significantly enhanced dynamic elastic modulus and markedly  redced drying shrinkage and chloride ion diffusion coefficient.  The micro-aggregate filling effect of slag powder and dolomite powder , along with their participation in the geopolymerization reaction to generate more C-A-S-H and C-S-H gels, resulted in a denser microstructure. These findings provide a basis for geopolymer mix design.

Key words: geopolymer concrete; solid waste materials; mechanical properties; durability; microstructure

项目来源 : 江苏省科技计划项目 (KT202312)。

作者简介 : 潘  浩 (1983—) , 男, 本科, 高级工程师, 研究方向 : 地铁施工。

通信作者 : 张昊鹏 (1981—) , 男, 本科, 高级工程师, 研究方向 : 地铁施工。

收稿日期 : 2025-09-02