Effects of fly ash and cement content on rheological, mechanical, and transport properties of high-performance self-compacting concrete
Effects of fly ash and cement content on rheological, mechanical, and transport properties of high-performance self-compacting concrete
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DOI：
10.1515/secm-2012-0052
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发表时间：
2012-12
期刊：
影响因子：
--
通讯作者：
M. Jalal;E. Mansouri
中科院分区：
文献类型：
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作者：
M. Jalal;E. Mansouri
摘要本文研究了不同水泥掺量和粉煤灰掺量的高性能自密实混凝土的流变、力学和运输性能。不同的HPSCC混合物进行了研究，水泥含量为400，450和500公斤/立方米和粉煤灰的百分比为5%，10%和15%。为了提高混凝土的耐久性，在幂0.45级配曲线的基础上，对级配曲线进行了修正和改进。为了更好地理解飞灰效应和比较的目的，使用恒定的水与粘合剂的比率（w/B=0.38）。通过坍落流动时间、直径和V型漏斗流动时间观察其流变性能。在7、28和90天测定机械性能，包括压缩和劈裂拉伸强度。采用吸水率、毛细吸附、氯离子百分比和电阻率测试进行了全面的运输调查。结果表明，粉煤灰对水泥的流变性能有一定的改善，掺量为15%时，90 d抗压强度提高约10%。一个相对显着的改善也被认为是在所有的运输性能，通过增加粉煤灰的百分比和水泥含量，特别是在较高的年龄。
Abstract Rheological, mechanical, and transport properties of high-performance self-compacting concrete (HPSCC) mixes with different cement contents and fly ash percentages are studied in this research. Different HPSCC mixtures were investigated with cement contents of 400, 450, and 500 kg/m3 and fly ash percentages of 5%, 10%, and 15%. In order to achieve an enhanced durability, the aggregate grading curve was modified and improved based on power 0.45 grading curve. For a better understanding of fly ash effect and comparison purposes, a constant water to binder ratio (w/b=0.38) was used. The rheological properties were observed through slump flow time and diameter and V-funnel flow time. Mechanical properties including compressive and splitting tensile strength were determined at 7, 28, and 90 days. A comprehensive transport investigation was carried out using water absorption, capillary absorption, chloride ion percentage, and resistivity tests. The results showed a desirable improvement in rheological properties, and the compressive strength improved by about 10% for 15% fly ash at 90 days. A relatively significant improvement was also considered in all transport properties by increasing the fly ash percentage and cement content, especially at higher ages.