论文部分内容阅读
对机制砂混凝土进行了冻融循环试验。考虑了三种强度等级(C30、C40、C50)和四种介质(清水、质量分数为5%的氯化钠溶液、质量分数为5%的硫酸钠溶液和5%氯化钠溶液+5%硫酸钠溶液组成的混合盐溶液)。重点考察质量损失率、相对动弹性模量和抗压强度的变化。结果表明:随着冻融循环次数的增加,四种环境下机制砂混凝土的质量、相对动弹性模量和抗压强度均呈下降趋势;盐的存在加剧了机制砂混凝土在冻融循环过程中产生的表层剥落,却减缓了机制砂混凝土相对动弹性模量的下降;盐溶液种类对机制砂混凝土冻融后质量损失率和相对动弹性模量的影响程度不同,氯化钠比硫酸钠的破坏力强。
Mechanized sand concrete was subjected to freeze-thaw cycles. Considered three intensity levels (C30, C40, C50) and four media (water, 5% sodium chloride solution, 5% sodium sulfate solution and 5% sodium chloride solution + 5% Sodium sulfate solution, a mixed salt solution). Focus on quality loss rate, relative dynamic elastic modulus and compressive strength changes. The results show that with the increase of the number of freeze-thaw cycles, the quality, relative dynamic elastic modulus and compressive strength of the mortar under four environments all show a decreasing trend. The presence of salt exacerbates the impact of the mechanized sand on the freeze-thaw cycles The surface spalling, however, slowed down the relative dynamic elastic modulus of the machine-made sand concrete. The effect of salt solution on the mass loss rate and the relative dynamic elastic modulus of the machine-made sand concrete after freeze-thaw was different. Sodium chloride Destructive.