王刚，蔡晋.纳米材料改性硅酸盐水泥基注浆材料试验研究[J].河南理工大学学报(自然科学版)，doi:10.16186/j.cnki.1673-9787.2024030080.

WANG G, CAI J. Experimental study on nano-material modified Portland cement-based grouting material [J]. Journal of Henan Polytechnic University (Natural Science), doi:10.16186/j.cnki.1673-9787. 2024030080.

纳米材料改性硅酸盐水泥基注浆材料试验研究(网络首发)

王刚^1,2，蔡晋^1,2

1.山东科技大学 山东省土木工程防灾减灾重点实验室，山东 青岛 266590；2.山东科技大学 土木工程与建筑学院，山东 青岛 266590

摘要: 目的 针对岩体微裂隙注浆加固防渗的工程问题， 方法 本文通过田口-灰色关联优化分析方法及正交试验研制了一种纳米材料改性的硅酸盐水泥基注浆材料，并基于田口方法的信噪比分析研究了纳米碳酸钙掺量、聚羧酸减水剂掺量、超细粉煤灰掺量和水灰比对注浆材料的黏度、析水率、凝结时间和结石体强度等基本性能的影响规律。 结果 正交试验结果表明：通过田口-灰色关联优化分析得出的最优配比下的注浆材料具有较好的流动性能和力学性能，保证了注浆材料的可注性和加固效果。影响规律的信噪比分析表明：纳米碳酸钙对注浆材料流动性能影响较大，随着纳米碳酸钙掺量增加，注浆材料黏度升高，析水率逐渐降低，结石体28 d强度先增加后减小；聚羧酸减水剂有助于降低注浆材料黏度，但会导致凝结时间延长、析水率提高，对结石体28 d强度影响较小；超细粉煤灰有助于降低注浆材料黏度，但对缩短凝结时间和提高结石体28 d强度不利；水灰比对析水率、凝结时间和结石体28 d强度的影响最为显著，随着水灰比增加，注浆材料的流动性能有所改善，但会导致凝结时间延长、结石体28 d强度降低。 结论 本文所研制的纳米材料改性硅酸盐水泥基注浆材料具有较好的流动性、稳定性和力学性能，研究成果可以对实际注浆工程的材料选择提供理论和试验依据。

关键词: 注浆材料；正交试验；田口方法；纳米碳酸钙；微裂隙

doi: 10.16186/j.cnki.1673-9787.2024030080

基金项目: 国家自然科学基金资助项目（52079077）

收稿日期：2024-03-29

修回日期：2024-05-06

网络首发日期：2024-10-30

Experimental study on nano-material modified Portland cement-based grouting

 material

WANG Gang^1,2, CAI Jin^1,2

1.Shandong Provincial Key Laboratory of Civil Engineering, Disaster Prevention and Mitigation, Shandong University of Science and Technology, Qingdao 266590, Shandong, China; 2.College of Civil Engineering, Shandong University of Science and Technology, Qingdao 266590, Shandong, China

Abstract: Objectives For the engineering problem of rock mass microfracture grouting towards reinforcement and seepage prevention, Methods a Portland cement-based grouting material modified by nano-material was developed through Taguchi-grey correlation optimization analysis method and orthogonal test. Based on the signal-to-noise analysis of Taguchi method, the influence law of dosage of nano-CaCO₃, polycarboxylate superplasticizer, ultrafine fly ash and water-cement ratio to the properties of grouting material such as viscosity, water release rate, setting time and stone body strength was analyzed systematically. Results According to the orthogonal test results, the grouting material under the optimal ratio obtained from Taguchi-grey correlation optimization analysis had considerable fluidity and mechanical properties, which ensured the injectability and reinforcement effect. According to the signal-to-noise ratio analysis of influence law, nano-CaCO₃ had a significant influence on the fluidity of grouting materials. The viscosity increased, water release rate gradually decreased, and the 28 d stone body strength increased firstly and then decreased with the increasing nano-CaCO₃ content. Polycarboxylate superplasticizer could decrease the viscosity of grouting material, but it would lead to the extended setting time and increased water release rate, and it had a comparatively low influence on the 28 d stone body strength. Ultrafine fly ash could also decrease the viscosity of grouting material, however, it was detrimental to shorten the setting time and to improve the 28 d stone body strength. The water-cement ratio had the most significant effect on water release rate, setting time and 28 d stone body strength. The fluidity of grouting material could be improved with increasing water-cement ratio, however, it would result in the prolongation of setting time and decreased 28 d stone body strength. Conclusions The nano-material modified cementitious grouting material developed had considerable fluidity, stability and mechanical properties, the results of the study provided theoretical and experimental support for the material selection of practical grouting engineering.

Key words: grouting material; orthogonal test; Taguchi method; nano-CaCO₃; microfracture