Wang Ning, Deng Yinger, Liu Shuai, Chen Lin
College of Environment and Civil Engineering, Chengdu University of Technology, Chengdu, 610059, China.
College of Civil Engineering and Architecture, China Three Gorges University, Yichang, 443002, China.
Sci Rep. 2025 May 27;15(1):18499. doi: 10.1038/s41598-025-01137-5.
In the process of repairing cracks in underwater buildings, the repair effect is not ideal due to the poor dispersion resistance and low retention rate of the slurry. In light of this, this study created a new magnetically driven cement-based (MDCGM) grouting material in this research that can be used to repair underwater building cracks. In this paper, a quadratic regression model was established with fluidity (X) as response values and bentonite content, water-cement ratio, FeO powder content, and flocculant content as influencing factors. The model has good fitting and reliability. Finally, the stone body's damage constitutive equation under various damage factors is determined. This article focuses on the study of the fluidity of the slurry and the compressive strength of the stone body, and conducts an analysis of the microstructure. Meanwhile, it establishes the damage constitutive equation of the stone body. The results show that the primary and secondary relationships of the influence factors on the response value X are: Water-cement ratio > Flocculant content > Bentonite content > FeO content. The fluidity of the slurry is between 212.5 mm and 437.5 mm. When the water-cement ratio, the content of bentonite, and the content of the flocculant are 1%, 3%, and 5% respectively, as the content of FeO increases from 10 to 15% and 20%, the 3-day compressive strength of the grouted body increases by 6.02% and 33.40% respectively, and the 7-day compressive strength increases by 2.65% and 5.67% respectively. This indicates that Fe₃O₄ can significantly improve the compressive strength of the early-stage grouted body. The damage constitutive equation is consistent with the experimental results and can predict the mechanical properties of the stone body of the grouting material.
在水下建筑物裂缝修复过程中，由于浆液的抗分散性差、留存率低，修复效果不理想。鉴于此，本研究制备了一种新型磁驱动水泥基灌浆材料（MDCGM）用于水下建筑物裂缝修复。本文以流动性（X）为响应值，膨润土含量、水灰比、FeO粉末含量和絮凝剂含量为影响因素，建立了二次回归模型。该模型具有良好的拟合度和可靠性。最后确定了不同损伤因素下岩体的损伤本构方程。本文重点研究了浆液的流动性和岩体的抗压强度，并进行了微观结构分析。同时，建立了岩体的损伤本构方程。结果表明，影响因素对响应值X的主次关系为：水灰比＞絮凝剂含量＞膨润土含量＞FeO含量。浆液的流动性在212.5mm至437.5mm之间。当水灰比、膨润土含量和絮凝剂含量分别为1%、3%和5%时，随着FeO含量从10%增加到15%和20%，灌浆体的3天抗压强度分别提高了6.02%和33.40%，7天抗压强度分别提高了2.65%和5.67%。这表明Fe₃O₄能显著提高灌浆体早期的抗压强度。损伤本构方程与试验结果一致，能够预测灌浆材料岩体的力学性能。
