高温条件下混凝土爆裂机理研究进展

Literature Review of Study on Mechanism of Explosive Spalling in Concrete at Elevated Temperatures

关键词:  混凝土,高温,爆裂,热开裂,温度梯度

Key words:  concrete,elevated temperature,explosive spalling,thermal cracking,temperature gradient

摘要:

对高温条件下混凝土爆裂的研究进行了全面综述,总结了混凝土爆裂发生的影响因素、成因机理及实验和理论研究的进展状况.提出了热开裂和孔隙水(汽)压力的耦合作用是产生混凝土爆裂和不确定性的主要原因.温升诱致混凝土爆裂是一个复杂的非线性问题,建立一个兼顾材料科学和力学的理论体系是全面理解混凝土温升爆裂的根本途径.

Abstract:

This paper presented a literature survey of explosive spalling of concrete at elevated temperatures. The affecting factors, mechanisms and the current theoretical and experimental studies were summarized respectively. The investigations results show that the coupling of thermal cracking and pore pressure is the main reason to induce the thermal spalling and uncertainty of explosive spalling. The explosive spalling induced by elevated temperatures is a complex nonlinear problem, which can be understood very well only through establishing a theory system introducing both the material science theory and the mechanics theory.