Influence of raw material temperature on the properties of silicate-modified polyurethane grouting materials

IF 6.5 2区工程技术 Q1 CONSTRUCTION & BUILDING TECHNOLOGY Case Studies in Construction Materials Pub Date : 2024-06-27 DOI:10.1016/j.cscm.2024.e03479

Qinhao Huang , Chao Yuan , Shuchen Li , Xianda Feng , Huiying Zhou , Yong Han , Yuhang Ye

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Abstract

Silicate-modified polyurethane (PU/WG) is an effective organic–inorganic hybrid-grouting material that blocks water and reinforces weak formations. In deep high-temperature formations, owing to environmental impacts, PU/WG raw materials are heated before grouting. To elucidate the basic characteristics of PU/WG grouting materials in deep, high-temperature environments, we investigated the effects of raw material temperature on the curing time and strength of PU/WG by considering different mass ratios during the curing time test. Furthermore, the influence of raw material temperature on the micro-structure of PU/WG was analysed from a microscopic perspective using scanning electron microscopy. Energy-dispersive X-ray spectroscopy revealed the composition and curing mechanism of PU/WG. The results indicated that as the raw material temperature increased from 24 to 60°C, the peak strength decreased from 41.65 to 14.51 MPa, and the peak strain decreased from 27.03 % to 8.83 %. Based on the experimental results of the curing time testing and strength test, we established a PU/WG curing time-variation model considering the coupling of raw material temperature and mass ratio and provided an optimisation scheme for the PU/WG strength, which provides effective guidance for grouting time design in high-temperature environments.

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原材料温度对硅酸盐改性聚氨酯灌浆材料性能的影响

硅酸盐改性聚氨酯（PU/WG）是一种有效的有机-无机混合灌浆材料，具有阻水和加固薄弱地层的作用。在深层高温地层中，由于环境影响，PU/WG 原材料在灌浆前需要加热。为了阐明 PU/WG 灌浆材料在深层高温环境中的基本特性，我们在固化时间试验中考虑了不同的质量比，研究了原材料温度对 PU/WG 固化时间和强度的影响。此外，我们还利用扫描电子显微镜从微观角度分析了原材料温度对聚氨酯/WG 微观结构的影响。能量色散 X 射线光谱分析揭示了聚氨酯/WG 的成分和固化机理。结果表明，随着原材料温度从 24°C 升至 60°C，峰值强度从 41.65 兆帕降至 14.51 兆帕，峰值应变从 27.03 % 降至 8.83 %。基于固化时间测试和强度测试的实验结果，我们建立了考虑原材料温度和质量比耦合的聚氨酯/WG 固化时间变化模型，并提供了聚氨酯/WG 强度的优化方案，为高温环境下的灌浆时间设计提供了有效指导。

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来源期刊

Case Studies in Construction Materials Multiple-

CiteScore

7.60

自引率

19.40%

发文量

842

审稿时长

63 days

期刊介绍： Case Studies in Construction Materials provides a forum for the rapid publication of short, structured Case Studies on construction materials. In addition, the journal also publishes related Short Communications, Full length research article and Comprehensive review papers (by invitation). The journal will provide an essential compendium of case studies for practicing engineers, designers, researchers and other practitioners who are interested in all aspects construction materials. The journal will publish new and novel case studies, but will also provide a forum for the publication of high quality descriptions of classic construction material problems and solutions.