聚氨酯泡沫注浆修复材料泡孔结构特征及抗压性能研究进展

Research Progress of the Cell Structure Characteristics and Compressive Properties of Polyurethane Foam Grouting Rehabilitation Materials

聚氨酯泡沫(PUF)注浆修复材料以轻质高强、快凝高膨胀等优势,在基础设施修复加固领域得到了广泛的应用。抗压性能是工程修复材料十分重要的力学指标之一,而材料的微观结构对其宏观力学行为有决定性影响。近年来,国内外专家学者对PUF注浆修复材料的微观结构特性和抗压性能进行了大量研究,但尚未见到系统性总结。本文介绍了PUF注浆修复材料的定义及反应过程,综述了其微观泡孔结构特性、压缩应力-应变关系和本构模型,从宏微观角度讨论了其变形和破坏机理,总结了密度、试件尺寸、应变率和特殊环境工况对压缩性能的影响机理及规律,最后展望了PUF注浆修复材料未来的研究方向。

Polyurethane foam(PUF)grouting rehabilitation materials are widely used in the field of infrastructure repair and reinforcement with the advantages of light weight,high strength,fast setting and high expansion.Compression resistance is one of the most important mechanical indexes of materials,and its microstructural characteristics determine the macro-mechanical behavior.In recent years,experts and scholars at home and abroad have conducted a lot of research on the microstructural properties and compressive properties of PUF grouting rehabilitation materials.However,a systematic summary has not been seen yet.This paper introduces the definition and reaction mechanism of PUF grouting rehabilitation materials,reviews their microscopic cell structural properties,compressive stress-strain relationships and constitutive models,discusses their deformation and damage mechanisms from macro and micro perspectives,and summarizes the mechanisms and laws of density,specimen size,strain rate and special environmental working conditions on the compressive properties.Finally,the future research directions of PUF grouting rehabilitation materials are prospected.