恒压钻入法检测火后混凝土损伤程度的可行性研究

A Feasibility Study on the Fire Damaged Concrete Detection with Core Drill Method at Constant Pressure

采用改进的恒压钻芯机对不同温度下的混凝土试块进行钻入试验,发现钻入速度随混凝土受火温度的升高而升高。又通过混凝土材性损伤的三个力学指标,弹性模量、抗压强度和劈拉强度来评估恒压钻入法的可行性。结果表明,恒压钻入法可以作为检测混凝土高温受损程度的一种辅助方法,基本可以反映出损伤随深度的变化。

In this paper,a modified core drill machine was used to perform drill test on concrete specimens subjected to different temperatures. Results showed that the rate of penetration（ ROP） increases with temperature. Besides,three mechanical indexes of concrete damage,namely modulus of elastic,compressive strength,and splitting tensile strength,were used to assess the feasibility of the modified core drill method. It was revealed that the modified core drill method can be used as an additional method to test concrete damages after high temperature and it can basically reflect the damage gradients with depth.