惰性材料和火山灰材料对自密实混凝土流动和力学性能的影响

Mehrdad Mahoutian, M. Shekarchi
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引用次数: 12

摘要

本研究研究了含有大量石灰石、偏高岭土、硅灰、沸石和粘度改性外加剂的自密实混凝土(SCC)的新鲜行为和机械性能。采用不同细度模量的两种细骨料,考察了砂级配对含惰性粉和火山灰粉的细砂混凝土力学性能和流动性能的影响。对所有14种新拌混凝土进行了坍落度流动、新拌混凝土和5分钟旧拌混凝土的v型漏斗、j型环、带j型环和不带j型环的Orimet、L-box和U-box试验,以检验自密实混凝土的新拌性能。硬化试样在7天和35天时进行抗压强度测试,并在28天时进行抗拉强度测试。结果表明,砂级配对SCC的新鲜性能有显著影响。偏高岭土、沸石、硅灰等活性粉体的加入并不能同时改善SCC的流动性能和力学性能。石灰石在高体积含量的SCC中可以有效地用作填料。由于现有标准不能令人满意,还建议对含有硅灰的SCC的l盒和u盒测试制定一套新的限制。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Effect of Inert and Pozzolanic Materials on Flow and Mechanical Properties of Self-Compacting Concrete
This research investigates the fresh behaviour and mechanical properties of self-compacting concrete (SCC) containing high volume of limestone, metakaolin, silica fume, zeolite, and viscosity modifying admixture. Two fine aggregates with different fineness modulus were also utilized to evaluate the effect of sand’s gradation on the mechanical and flow properties of SCC containing inert and pozzolanic powder. Slump flow, V-funnel for fresh concrete and 5-minute-old concrete, J-ring, Orimet with and without J-ring, and L-box and U-box tests were performed on all 14 fresh concrete mixtures to examine the fresh properties of self-compacting concrete. Compressive strength of hardened specimens was measured at 7 and 35 days and tensile strength was also determined at the age of 28 days. The results show that sand grading significantly affects the fresh properties of SCC. It is also concluded that high volume of active powders including metakaolin, zeolite, and silica fume could not improve both the flow and mechanical properties of SCC at the same time. Limestone can be effectively used as filler in SCC in high volume content. A new set of limits for the L-box and U-box tests for SCC containing silica fume is also recommended as the existing criteria are not satisfactory.
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