宁夏地区白云碎屑灰岩粗骨料品质对预拌混凝土性能的影响  

Study on the Influence of the Quality of Coarse Aggregate of White Cloud Clastic Limestone on the Performance of Ready-Mixed Concrete in Ningxia Area

作　　者：王进军 王存福 杨岩 焦全春 张志成 朱永和 李禄禄 刘莹 WANG Jinjun;WANG Cunfu;YANG Yan;JIAO Quanchun;ZHANG Zhicheng;ZHU Yonghe;LI Luu;LIU Ying(Ningxia Shuifa Haiyuan Water Supply Co.,Ltd.,Zhongwei 755000,China;Jianghe Anlan Engineering Consulting Co.,Ltd.,Zhengzhou 450003,China)

机构地区：[1]宁夏水发海原供水有限公司,宁夏中卫755000 [2]江河安澜工程咨询有限公司,河南郑州450003

出　　处：《河南科技》2024年第3期48-51,共4页Henan Science and Technology

摘　　要：【目的】水利与建筑行业在混凝土原材料、配合比等方面存在差异,导致预拌混凝土在水利工程中的应用受到影响,所以需要对其影响情况进行研究。【方法】通过对宁夏地区白云碎屑灰岩进行室内试验,研究混凝土粗骨料最大粒径、泥块含量和针片状含量对混凝土工作性能、抗压强度、抗冻性,并通过SEM分析观察泥块含量对混凝土密实性和黏结强度的影响。【结果】试验结果表明:粗骨料最大粒径对预拌混凝土性能影响较小;随着粗骨料泥块含量的增大,预拌混凝土工作性能明显降低;随着针片状骨料含量的增加,水泥混凝土的坍落度呈降低趋势;通过SEM技术发现骨料中泥块含量增加将导致不同程度的结构薄弱区和缺陷。【结论】通过对预拌混凝土性能影响因素进行研究,对宁夏地区水利工程质量控制具有指导意义,为地方水利工程质量检测提供参考。[Purposes]The differences in concrete raw materials and mix proportions between water con-servancy and construction industries have affected the application of ready-mixed concrete in water con-servancy projects,so it is necessary to study its impact.[Methods]Through the indoor test of dolomite clastic limestone in Ningxia area,the effects of the maximum particle size of concrete coarse aggregate,the content of mud and the content of needle flake on the working performance,compressive strength and frost resistance of concrete were studied,and the effect of mud content on the compactness and bonding strength of concrete was observed by SEM analysis.[Findings]The test results show that the maximum particle size of coarse aggregate has little effect on the performance of ready-mixed concrete.With the in-crease of the content of coarse aggregate mud block,the working performance of ready-mixed concrete is obviously reduced.With the increase of the content of needle-like aggregate,the slump of cement con-crete decreases.Through SEM technology,it is found that forming different degrees of structural weak ar-eas and defects.[Conclusions]Through the research on the influencing factors of ready-mixed concrete performance,it has guiding significance for the quality control of water conservancy projects in Ningxia,and provides reference for the quality inspection of local water conservancy projects.

关 键 词：预拌混凝土 最大粒径 泥块含量 针片状含量 SEM分析 

分 类 号：TV62[水利工程—水利水电工程] TV882.1