氯盐侵蚀环境下钢纤维再生混凝土抗压性能试验研究

发布时间：2018-02-01 11:39

本文关键词： 氯盐侵蚀钢纤维再生混凝土抗压性能氯离子　出处：《应用力学学报》2014年06期 　论文类型：期刊论文

【摘要】：探讨了钢纤维再生混凝土在氯盐侵蚀环境下的抗压性能。首先,在室内配制水灰比分别为0.45、0.53、0.61的标准立方体钢纤维再生混凝土试件各27个,在标准条件下养护28d;再将这三种水灰比的试件分别浸入浓度为2.0%、3.5%、5.0%的Na Cl溶液中浸泡50d、100d、150d,并测得其抗压强度;最后分别对标准立方体试件上深度为5mm~25mm处的氯离子含量进行了测定。试验结果表明:随着水灰比的减小,钢纤维再生混凝土抗压强度逐渐增大;在浸泡天数相同的条件下,其抗压强度随着氯离子浓度的增加呈降低趋势,且在同一深度下水灰比越大的试件,侵入的氯离子浓度越高;在浸泡浓度相同的条件下,其抗压强度随着浸泡时间的增长而降低。
[Abstract]:The compressive performance of steel fiber recycled concrete under chloride erosion environment is discussed. Firstly, the ratio of water to cement prepared indoors is 0.45 ~ 0.53 respectively. 0.61 standard cube steel fiber recycled concrete specimens, each 27, maintained under the standard conditions for 28 days; Then the three water-cement ratio specimens were immersed in 2.0% 3.5% NaCl solution for 50 d ~ 100 d ~ 150 d, respectively, and the compressive strength was measured. Finally, the chloride ion content at the depth of 5 mm to 25 mm on the standard cube specimen is measured. The results show that the compressive strength of steel fiber recycled concrete increases with the decrease of water-cement ratio. Under the condition of the same soaking days, the compressive strength decreased with the increase of chloride concentration, and the higher the soaking ash ratio was at the same depth, the higher the chloride ion concentration was. Under the same immersion concentration, the compressive strength decreases with the increase of soaking time.
【作者单位】：湖南科技大学;中南大学;
【基金】：国家自然科学基金(41172275;41372303) 湖南省交通厅科技进步与创新项目(201229)
【分类号】：TU528
【正文快照】： 1引言所谓钢纤维再生混凝土,是一种将短而不连续的钢纤维均匀乱向分散于混凝土中组成的可浇筑、可喷射成型的新型复合材料[1]。钢纤维界面粘结性能决定混凝土增强、增韧、阻裂能力的发挥。试验研究和工程实践表明,由于普通强度混凝土常因其界面粘结过早失效导致钢纤维的增强作

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