上海交通大学学报

上海交通大学学报

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矿渣与粉煤灰协同改善碱激发建筑固废力学性能演化、凝结特性与流变行为

  

  1. 1 安徽理工大学 土木建筑学院，安徽 淮南 232001； 2 中国建筑第二工程局有限公司，北京 100160； 3安徽省特种设备检测院，合肥 230051
  • 作者简介:黄国栋（1982—），副教授，从事工业固体废弃物的安全消纳与资源化利用，碱激活材料相关研究；E-mail：hgd522500@163.com
  • 基金资助:
    安徽省自然科学基金面上项目(2308085ME184)，2023年度芜湖市科技局应用基础研究项目(2023jc01)，安徽省教育厅2023年新时代育人质量工程项目(2023qygzz021)

Synergistic Improvement of Mechanical Properties  Evolution, Coagulation Characteristics, and Rheological Behavior of Alkali Activated Construction Solid Waste by Slag and Fly Ash

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  1. 1. School of Civil Engineering and Architecture, Anhui University of Science and Technology, Huainan 232001, Anhui, China; 2. China Construction Second Engineering Bureau Co., Ltd., Beijing 100160, China; 3. Special Equipment Inspection Institute of Anhui, Hefei 230051, China

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摘要： 研究突破建筑固废胶凝材料活性调控技术壁垒，开发矿渣-粉煤灰-建筑固废三元协同活化体系，通过多尺度耦合分析方法揭示多元固废组分协同活化机理。结果表明，建筑固废：矿渣：粉煤灰质量比5:3:2，体系性能实现突破性提升，28 d抗压强度75.2 MPa，初凝时间优化至60 min，胶砂流动度扩展至159 mm，破解工作性与强度协同提升技术难题。微观表征证实，矿渣持续释放活性Ca2+，粉煤灰提供高反应硅铝相，双重复合激发建筑固废惰性硅氧网络解聚重组，生成硅酸钙与铝硅酸钙晶体，显著降低微观裂缝数量，提高整体性、均匀性与密实性，为构建高性能固废基胶凝材料提供组成设计、界面调控与结构优化解决方案，推动建筑固废资源化进入高附加值应用新阶段。

关键词: 碱激发, 建筑固废, 矿渣, 抗压强度, 初终凝时间, 流动性

Abstract:

Research has broken through the technical barriers of active regulation of building solid waste cementitious materials, developed a ternary synergistic activation system of slag fly ash construction waste powder, and revealed the synergistic activation mechanism of multiple solid waste components through multi-scale coupling analysis methods. The results showed that when the ratio of construction waste powder: slag: fly ash mass ratio was 5:3:2, the material performance achieved a breakthrough improvement, with a compressive strength of 75.2 MPa at 28 d, an optimized initial setting time of 60 min, and an expanded flowability of the binder sand to 159 mm, solving the technical problem of synergistic improvement of workability and strength. Microscopic characterization confirms that slag continuously releases active Ca2+, while fly ash provides a highly reactive silicon aluminum phase. The dual composite stimulates the depolymerization and recombination of inert silicon oxygen networks in construction waste powder, generating calcium silicate and aluminum calcium silicate crystals, significantly reducing the number of microscopic cracks, improving integrity, uniformity, and compactness. This provides a full chain solution for composition design, interface control, and structural optimization in the construction of high-performance solid waste based cementitious materials, promoting the resource utilization of construction solid waste into a new stage of high value-added applications.

Key words: alkali-activated, construction solid waste, slag, compressive strength, initial and final setting time, fluidity

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