不同轻质混凝土的强度及耐久性影响因素分析

发布时间：2018-04-23 08:07

本文选题：轻骨料混凝土 + 页岩陶粒　；参考：《混凝土》2017年07期

【摘要】：以LC30全轻页岩陶粒混凝土为基准开展不同轻质混凝土的正交试验,并以河砂取代率分别为5%、10%、15%、20%、25%时获得砂轻混凝土;以碎石取代率分别为5%、15%、25%、35%、45%时获得石轻混凝土;以普通砂石最佳取代率同时取代获得混合轻质混凝土(简称混轻混凝土)。试验结果表明,在合理取代率范围内,混轻混凝土的抗压强度、抗折强度和干表观密度得到显著提高,但碳化深度变化幅度较小;当河砂、碎石取代率分别为10%、20%时,其抗氯离子性能为最优;河砂取代率为20%时的砂轻混凝土、碎石取代率为25%时的石轻混凝土,其抗压强度、抗折强度较基准全轻混凝土提高幅度为最大;其干表观密度则分别随碎石、河砂取代率增加呈现线性增长;其碳化深度则随碎石替代率增加而逐渐减小,但却随河砂取代率增加而逐渐增大;其6 h电通量与碎石取代率(除一点外)呈正相关,表明其抗氯离子性能降低,但却与河砂取代率呈负相关,表明其抗氯离子性能增强。
[Abstract]:The orthogonal test of different lightweight concrete is carried out on the basis of LC30 full light shale ceramsite concrete, and the sand replacement rate is 5 / 10 and 15 / 20 respectively, and the sand lightweight concrete is obtained at 25 / 25, and the replacement rate of crushed stone is 5 / 1515 / 25 / 35, and the stone light concrete is obtained at 45 / 45 respectively. The best replacement rate of ordinary sand and stone is used to replace the mixed light concrete (abbreviated as mixed light concrete) at the same time. The test results show that the compressive strength, flexural strength and dry apparent density of mixed light concrete are significantly increased in the range of reasonable replacement rate, but the change of carbonation depth is relatively small, and when the replacement rates of river sand and gravel are 10 and 20, respectively, The sand lightweight concrete with the sand replacement ratio of 20 and the stone light concrete with the gravel replacement ratio of 25 have the greatest increase in compressive strength and flexural strength as compared with the reference total lightweight concrete. The dry apparent density increases linearly with the increase of gravel, and the carbonation depth decreases with the increase of gravel substitution rate, but increases with the increase of river sand substitution rate. The 6 h electric flux was positively correlated with the substitution rate of crushed stone (except one point), which indicated that the resistance to chloride ion was decreased, but negatively correlated with the substitution rate of river sand, indicating that the resistance to chloride ion was enhanced.
【作者单位】：河南理工大学生态建筑与环境构建河南省工程试验室;河南理工大学土木工程学院;河南理工大学万方科技学院;河南省建设集团有限公司;
【基金】：国家自然科学基金项目(41172317)
【分类号】：TU528

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