通过对历经荷载后受硫酸盐侵蚀的混凝土进行单轴压缩试验,研究了荷载水平和溶液浓度对混凝土力学性能变化规律及侵蚀机理的影响,并与历经荷载后受硫酸盐侵蚀高强混凝土的力学性能进行了对比分析。分析结果表明:随荷载水平的增大,未侵蚀试件的峰值应力、弹性模量和峰值应变均有减小趋势,而受浓度为5%和10%侵蚀试件的峰值应力和弹性模量均减小,峰值应变增大;相同荷载水平时,随溶液浓度的增大,混凝土的峰值应力和弹性模量减小,峰值应变增大;随着荷载水平和溶液浓度的增大,普通混凝土和高强混凝土的应力-应变曲线均有变饱满的趋势,普通混凝土的主要力学指标比高强混凝土变化更显著。研究结果可为在硫酸盐侵蚀环境下的受损伤混凝土结构设计提供一定的参考依据。
Abstract
Through uniaxial compressive test on sulfate-corroded concrete specimens after loading, we investigated the influences of load level and sulfate solution concentration on the mechanical properties and erosion mechanism. Furthermore, we compared the mechanical properties with those of high strength concrete. Results revealed that 1) with the increase of load level, the peak stress, elastic modulus and peak strain of non-corroded specimens decreased, whereas the peak stress and elastic modulus of specimens corroded by sulfate solutions of 5% or 10% concentration decreased while peak strain increased; 2) when load level remained constant, as solution concentration increased, the peak stress and elastic modulus of specimens decreased, and the peak strain increased; 3) as load level and solution concentration increased, the stress-strain curves of ordinary concrete and high strength concrete plumped gradually, and the main mechanical indices of ordinary concrete changed more significantly than those of high strength concrete. The research results can provide certain reference basis for the design of pre-damaged concrete structures under sulfate environment.
关键词
普通混凝土 /
高强混凝土 /
力学性能 /
荷载 /
硫酸盐侵蚀
Key words
high strength concrete /
mechanical properties /
loading /
sulfate corrosion /
ordinary concrete
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