高掺量粉煤灰和矿渣高强混凝土抗渗性和抗冻性试验

发布时间：2018-02-12 02:33

本文关键词： 粉煤灰矿渣混凝土微观结构氯离子渗透抗冻性　出处：《农业工程学报》2017年06期 　论文类型：期刊论文

【摘要】：采用粉煤灰和矿渣2种掺合料的40%和50%2种质量比例掺量,制备了高掺合料C50高强混凝土,并利用扫描电镜和X射线衍射技术分析了高比例掺合料对高强混凝土强度的影响,最后通过抗氯离子渗透试验和快速冻融试验综合分析了高掺合料C50高强混凝土的耐久性。结果表明:当复掺掺合料总质量占胶凝材料总质量的50%时,随着粉煤灰与矿渣掺入量比值的减小混凝土养护28 d强度有所增加;在掺合料总质量不变的情况下,混凝土的抗冻性和抗氯离子渗透性能均随着粉煤灰掺入量的增加和矿渣掺入量的减小而逐渐提升,但掺合料总质量的增加会降低抗氯离子渗透性能;采用抗冻耐久性指数与电通量的比值法可较好的综合评价高掺合料高强混凝土的耐久性,耐久性较好的适宜配合比为掺合料总量50%,粉煤灰与矿渣掺量比为4:1。研究可为高掺量粉煤灰和矿渣在高强混凝土中的应用提供依据,同时达到提高高强混凝土的经济性和节约资源的目的。
[Abstract]:High strength concrete with high admixture C50 was prepared by using 40% and 50 mass ratios of fly ash and slag, and the influence of high proportion admixture on strength of high strength concrete was analyzed by SEM and XRD. Finally, the durability of high strength concrete with high admixture C50 is comprehensively analyzed through chloride ion permeation test and rapid freeze-thaw test. The results show that when the total mass of compound admixture accounts for 50% of the total mass of cementitious material, With the decrease of the ratio of fly ash to slag, the strength of concrete is increased for 28 days, and when the total mass of the admixture remains unchanged, The frost resistance and chloride ion permeability of concrete are improved with the increase of fly ash and slag content, but the total quality of admixture will decrease the permeability of chloride ion. The durability of high strength concrete with high admixture can be evaluated by using the ratio of freezing durability index and electric flux. The suitable mix ratio with good durability is the total amount of admixture 50 and the ratio of fly ash to slag is 4: 1.The research can provide the basis for the application of high content fly ash and slag in high strength concrete. At the same time, the purpose of improving the economy of high strength concrete and saving resources is achieved.
【作者单位】：东北电力大学建筑工程学院;天津大学建筑工程学院;
【基金】：国家自然科学基金资助(51178305,51578370) 东北电力大学研究生创新基金资助(Y2015025)
【分类号】：TU528

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