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| 粉煤灰调控碱矿渣注浆材料流动性与凝结规律及力学性能研究 |
| Fly ash regulates the flowability of alkali slag grouting materials and Research on Condensation Law and Mechanical Properties |
| 投稿时间：2025-09-04 修订日期：2025-10-29 |
| DOI： |
| 中文关键词: 碱激发 注浆材料 抗压强度 流动性 凝结时间 |
| 英文关键词: Alkali-activated Grouting material Compressive strength mobility Condensation time |
| 基金项目:安徽省自然科学基金面上项目“水泥改善煤矸石碱激发双胶凝材料设计与协同增强机理”(2308085ME184)；2023年度芜湖市科技局应用基础研究项目“水泥改善垃圾焚烧底灰碱激发双胶凝材料设计与协同增强机理”(编号2023jc01)；安徽省教育厅2022年高等学校省级质量工程项目“安徽理工大学芜湖秋华集团实践教育基地”(2022xghz015)； |
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| 中文摘要: |
| 针对碱矿渣注浆材料流动性不足与凝结过快的问题，采用粉煤灰对其进行改性增强，借助粉煤灰的形态效应与活性效应调节注浆材料的流动性与凝结时间。结果表明，粉煤灰的掺入可显著提高碱矿渣注浆材料的流动性，并明显延缓初凝和终凝时间，但也引起抗压强度下降。随粉煤灰掺量增加，注浆材料的流动性先增大后降低，初终凝时间不断延长，抗压强度持续减小。当掺量30%时综合性能最优，此时流动扩展度增至305 mm，初凝与终凝时间分别延长至32分50秒和45分10秒，各龄期抗压强度分别为6.6 MPa（2 h）、21.2 MPa（1 d）、30.7 MPa（3 d）和50.4 MPa（28 d），能满足各类注浆需求。XRD与FT-IR分析表明，粉煤灰通过“滚珠效应”和较低的反应活性改善了流动性并延缓凝结；但随粉煤灰掺量提高，体系中活性钙含量持续降低，影响了硅酸钙与铝硅酸钙凝胶的生成，从而导致抗压强度下降。 |
| 英文摘要: |
| To address the issues of insufficient fluidity and excessively rapid setting of alkali-activated slag grouting materials, fly ash was incorporated to modify and enhance the performance, leveraging its morphological effect and pozzolanic activity to regulate the fluidity and setting time of the grouting material. The results indicated that the addition of fly ash significantly improved the fluidity and markedly delayed both the initial and final setting times. However, it also led to a reduction in compressive strength. As the fly ash content increased, the fluidity of the grouting material initially increased and then decreased, the initial and final setting times were progressively extended, and the compressive strength continued to decline. The overall performance was optimized at a 30% fly ash content, at which the fluidity reached 305 mm, the initial and final setting times were extended to 32 minutes 50 seconds and 45 minutes 10 seconds, respectively, and the compressive strengths at various ages were 6.6 MPa (2 h), 21.2 MPa (1 d), 30.7 MPa (3 d), and 50.4 MPa (28 d), meeting the requirements for various grouting applications. XRD and FT-IR analyses revealed that fly ash improves fluidity and delays setting through the ball bearing effect and its relatively low reactivity. However, with increasing fly ash content, the active calcium content in the system continuously decreased, which hindered the formation of calcium silicate hydrate and calcium aluminosilicate hydrate gels, consequently leading to the decline in compressive strength. |
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