【作者】 李斌； 杨晨旭； 王晨霞；

【Author】 LI Bin;YANG Chenxu;WANG Chenxia;School of Civil Engineering,Inner Mongolia University of Science and Technology;

【机构】 内蒙古科技大学土木工程学院；

【摘要】 通过对4组不同配合比的水淬钢渣混凝土试件进行抗冻性能试验,研究了钢渣细骨料取代率和复合盐溶液浓度对不同冻融循环次数后钢渣混凝土的相对动弹性模量以及质量损失率的影响。结果表明:掺量为100%组钢渣混凝土100次复合盐冻循环后质量损失率最大,达到3.65%;30%掺量组钢渣混凝土抗冻性最好,100次复合盐冻循环后质量损失率为2.5%,优于普通混凝土0.17%,相对动弹性模量为70.1%,高于普通混凝土4.1%。钢渣混凝土受不同浓度复合盐溶液冻融循环后质量均表现为先增加后减小,100次盐冻循环后11.1%浓度组质量损失率为5.16%,是3.7%浓度组的1.41倍。结合SEM进行微观分析,从微观角度解释钢渣混凝土复合盐冻后发生破坏的原因为新物质的生成和裂缝的持续发展,50次冻融循环后复合盐溶液浓度的提高加速了钢渣混凝土微观结构的破坏。更多还原

【Abstract】 Through the frost resistance test of 4 groups of water-quenched steel slag concrete specimens with different mix ratios,the relative dynamic elastic modulus of steel slag concrete after different freezing and thawing cycles of the replacement rate of steel slag fines and the concentration of the compound salt solution were studied The impact of quantity and quality loss.The results showed that the mass loss rate of steel slag concrete with 100% dosage was the largest after 100 cycles of composite salt freezing,reaching 3.65%.The 30% steel slag concrete had the best frost resistance.The mass loss rate after 100 cycles of composite salt freezing was 2.5%,which was better than that of ordinary concrete 0.17%,and the relative dynamic elastic modulus was 70.1%,which was higher than that of ordinary concrete 4.1%.The mass of steel slag concrete after freeze-thaw cycles with different concentrations of composite salt solution increased first and then decreased.After 100 cycles of salt freezing,the mass loss rate of 11.1% concentration group was 5.16%,1.41 times that of 3.7% concentration group.Combined with SEM microscopic analysis,from the microscopic point of view to explain the reasons for the failure of steel slag concrete composite salt after freezing were the generation of new substances and the continuous development of cracks.After 50 freeze-thaw cycles,the increase of composite salt solution concentration accelerated the destruction of steel slag concrete microstructure.更多还原