论文部分内容阅读
为研究超声波对冻融循环与硫酸盐侵蚀耦合作用下水工混凝土的检测效果,开展了冻融循环与硫酸盐(5%Na2SO4)侵蚀耦合作用下湿筛混凝土试验,利用超声波检测仪测试分析了波速随冻融循环次数的变化规律及波速与抗压强度之间的关系。结果表明,波速随冻融次数的增加而逐渐减小,尤其是200次以后急剧下降,波速与冻融次数之间呈抛物线关系,并与抗压强度密切相关,可以反映出湿筛混凝土的抗冻性能变化,为运用波速评价冻融循环与硫酸盐侵蚀耦合作用下湿筛混凝土的损伤性能提供了理论依据。
In order to study the effect of ultrasonic on the detection of hydraulic concrete under the coupling of freeze-thaw cycles and sulfate erosion, a wet-screened concrete test under the coupling of freeze-thaw cycles and sulfate (5% Na2SO4) was carried out. The ultrasonic test The variation of wave velocity with the number of freeze-thaw cycles and the relationship between wave velocity and compressive strength. The results show that the wave velocity decreases with the increase of the number of freeze-thaw cycles, especially after 200 times. The wave velocity and the number of freeze-thaw cycles have a parabolic relationship and are closely related to the compressive strength, which can reflect the anti- The change of the freezing performance provides a theoretical basis for the application of wave velocity to evaluate the damage performance of wet-screened concrete under the coupling of freeze-thaw cycles and sulfate attack.