高强珊瑚砂灌浆材料制备与早期膨胀性能研究
作者:
作者单位:

1.中冶建筑研究总院有限公司;2.东北农业大学 水利与土木工程学院;3.北京科技大学 城镇化与城市安全研究院

基金项目:

国家重点研发计划青年科学家项目(2023YFB3711800);国家自然科学基金资助项目(52178263);中国五矿集团有限公司青年科技基金项目(2024QNJJB14);中冶集团“181计划”重大研发项目(CBN2022Kt01)


Study on Preparation and Early-age Expansion Properties of High Strength Coral Sand Cementitious Grouting Material
Author:
Affiliation:

1.Central Research Institute of Building and Construction,MCC Group Co,Ltd Beijing;2.School of Water Conservancy and Civil Engineering,Northeast Agricultural University;3.Research Institute of Urbanization and City Safety, University of Science and Technology Beijing, Beijing

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    摘要:

    为提高珊瑚骨料水泥基材料性能,特研究制备高强珊瑚砂灌浆材料.试验研究了珊瑚砂最大粒径、水胶比及微珠掺量对其性能的影响,并研究了早强剂、塑性及硬化后膨胀剂对其48h内竖向膨胀率(εv)全曲线的影响.结果表明:灌浆材料的强度随最大粒径减小而先增后降,超早期缓凝现象较明显;早强剂与塑性膨胀剂的组合可实现超早期εv的可控发展。在本研究范围内,珊瑚砂最大粒径1.25mm、水胶比0.24、微珠掺量30%,早强剂、塑性膨胀剂、HP-CSA膨胀剂掺量1%、0.06%、4%时,灌浆材料性能表现相对最优.

    Abstract:

    To improve the performance of coral aggregate cementitious grouting material, specially researching and preparing high-strength coral aggregate cementitious grouting. The effects of maximum grain size of coral sand, water-binder ratio and admixture content on the properties of coral sand cementitious grouting material were investigated. The effects of early strength agent, plastic expansion agent and post-hardening expansion agent on the vertical expansion rate curve(εv) in 48 hours were further studied. The results show that the strength of grouting material increases first and then decreases with the decrease of the maximum grain size, and the super-early retarding phenomenon is obvious. The combination of early strength agent and plastic expansion agent could realize the controllable development of εv in the super early stage. Within the scope of this study, when the maximum particle size of coral sand is 1.25mm, the water-binder ratio is 0.24, the content of ultrafine fly ash is 30%, and the content of early strength agent, plastic expansion agent and the expansion agent of HP-CSA is 1%, 0.06% and 4%, the performance of coral sand cementitious grouting material is relatively good.

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  • 收稿日期:2025-02-10
  • 最后修改日期:2025-04-02
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