沙漠砂高强混凝土力学性能研究

发布时间：2018-01-14 15:13

本文关键词：沙漠砂高强混凝土力学性能研究　出处：《混凝土与水泥制品》2015年02期 　论文类型：期刊论文

【摘要】：通过正交试验,分析了粉煤灰掺量、沙漠砂替代率、砂率和水胶比对沙漠砂高强混凝土7d、28d、56d和100d抗压强度的影响;在正交试验基础上,保持砂率和水胶比不变,进一步揭示沙漠砂替代率和粉煤灰掺量对沙漠砂高强混凝土28d抗压强度和劈裂拉伸强度的影响规律。试验研究表明,随着沙漠砂替代率增加,沙漠砂高强混凝土抗压强度和劈裂拉伸强度呈现先增大后减小趋势,沙漠砂替代率为20%时,沙漠砂高强混凝土抗压强度和劈裂拉伸强度均达到最大值;随着粉煤灰掺量增加,沙漠砂高强混凝土抗压强度和劈裂拉伸强度先增大后减小,粉煤灰掺量为15%时,沙漠砂高强混凝土抗压强度和劈裂拉伸强度达到最大值,为沙漠砂在工程中的应用提供指导和借鉴。
[Abstract]:The effects of fly ash content, desert sand substitution rate, sand ratio and water-binder ratio on the compressive strength of desert sand high strength concrete were analyzed by orthogonal test. On the basis of orthogonal test, the sand ratio and water-binder ratio are kept constant. The effects of desert sand substitution ratio and fly ash content on the 28d compressive strength and splitting tensile strength of desert sand high strength concrete are further revealed. The experimental results show that the desert sand substitution rate increases with the increase of desert sand replacement rate. The compressive strength and splitting tensile strength of desert sand increased first and then decreased. When the sand substitution ratio was 20, the compressive strength and split tensile strength of desert sand reached the maximum. With the increase of fly ash content, the compressive strength and splitting tensile strength of desert sand high strength concrete firstly increase and then decrease. The compressive strength and splitting tensile strength of desert sand reach the maximum, which provides guidance and reference for the application of desert sand in engineering.
【作者单位】：宁夏大学土木与水利工程学院;
【基金】：国家自然基金项目(11162015、51368048) 区级大学生创新试验(20140135)
【分类号】：TU528
【正文快照】： 0前言粉煤灰是煤经高温燃烧后形成的一种类火山灰质混合材料。在混凝土中掺加粉煤灰以取代相同质量或体积水泥,不仅能使粉煤灰变废为宝,而且可以显著改善混凝土和易性,在保护环境和节省资源方面取得很大社会效益和经济效益[1]。砂是制备混凝土必不可少的组份之一,在经过大规模

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