| 黄国栋,高剑,齐俊,郝金宇.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[J].安徽建筑大学学报,2026,34(2):9-17 |
| 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 |
| Research on the Regulation of Fluidity, Setting Laws, and Mechanical Properties of Alkali-Activated Slag Grouting Materials by Fly Ash |
| |
| 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 fluidity setting time |
| 基金项目: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）；安徽省教育厅高等学校省级质量工程项目（2022xghz015） |
| 作者 | 单位 | | 黄国栋 | School of Civil Engineering and Architecture,Anhui University of Science and Technology,Huainan 232001,China | | 高剑 | School of Civil Engineering and Architecture,Anhui University of Science and Technology,Huainan 232001,China | | 齐俊 | School of Civil Engineering and Architecture,Anhui University of Science and Technology,Huainan 232001,China | | 郝金宇 | School of Civil Engineering and Architecture,Anhui University of Science and Technology,Huainan 232001,China |
|
| 摘要点击次数: 171 |
| 全文下载次数: 0 |
| 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、终凝时间，但会造成抗压强度下降。随着粉煤灰掺量增加，注浆材料的流动性先增大后降低，初凝、终凝时间持续延长，抗压强度不断减小。当粉煤灰掺量为30%时，材料综合性能最优，此时流动扩展度增至305 mm，初凝、终凝时间分别延长至32 min 50 s和45 min 10 s；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），可满足各类注浆需求。XRD与FT-IR分析结果表明，粉煤灰依靠滚珠效应与较低的反应活性，有效改善了浆体流动性，延缓了凝结进程；但随着粉煤灰掺量增大，体系中活性钙含量持续降低，抑制了硅酸钙、铝硅酸钙凝胶的生成，最终导致材料抗压强度下降。 |
| 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, leading to the decline in compressive strength. |
|
查看全文
查看/发表评论 下载PDF阅读器 |
| 关闭 |
|
|
|
