硅灰和粉煤灰替代对含抗冲掺合料流态混凝土稳定性和强度的影响

K. Khayat, M. E. Gattioui, C. Nmai
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引用次数: 4

摘要

抗冲刷外加剂用于增强水泥基体系的稳定性,例如用于海洋结构的水下修复的混凝土,用于水上放置的自流平和无离析混凝土,以及用于喷射混凝土。用抗冲刷外加剂改性的混合物也可以加入硅灰或粉煤灰以增强新鲜和硬化性能。抗冲刷外加剂相对较新,缺乏系统的数据来比较它们在混凝土中的效率、优点和局限性,特别是在硅灰或粉煤灰混凝土中使用。在实验室进行了一项调查,以评估胶凝材料组合对三种常用抗冲刷外加剂制成的流动混凝土的新鲜和硬化性能的影响。每种抗冲刷外加剂以两种浓度使用,对应于混凝土中通常使用的相对低剂量和中等剂量。抗冲刷外加剂包括动力基产品、液体基纤维素材料和液体基微生物多糖。该混合物由100%的10型水泥、含有8%硅灰的混合硅灰水泥以及替换率为20%的F类粉煤灰制备。所有混合物的水胶比均为0.41,初始坍落度值为230±5mm(9.1±0.2英寸)。评价了粉煤灰和硅灰掺入对流体混合物坍落度保持、抗冲蚀、出血、离析、表面沉降、凝结时间、抗压和劈裂抗拉强度发展的影响。本文总结了21种混凝土配合比的试验研究结果。
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 Silica Fume and Fly Ash Replacement on Stability and Strength of Fluid Concrete Containing Anti-Washout Admixture
Anti-washout admixtures are used to enhance stability of cement-based systems, such as in the case of concrete intended for underwater repair of marine structures, self-leveling and segregation-free concrete for above-water placement, and for shotcrete. Mixtures modified with an anti-washout admixture can also incorporate silica fume or fly ash to enhance fresh and hardened properties. Anti-washout admixtures are relatively new, and there is a lack of systematic data comparing the efficiency, advantages, and limitations of using them in concrete, especially in silica fume or fly ash concrete. A laboratory investigation was undertaken to evaluate the effect of cementitious material combinations on fresh and hardened properties of fluid concrete made with three commonly used anti-washout admixtures. Each anti-washout admixture was used at two concentrations corresponding to relatively low and medium dosages that are typically used in concrete. The anti-washout admixtures included a power-based product, a liquid-based cellulosic material, and a liquid-based microbial polysaccharide. The mixtures were prepared with 100% of a Type 10 cement, a blended silica fume cement containing 8% silica fume, as well as a Class F fly ash used at 20% replacement. All mixtures were made with a 0.41 water-to-cementitious materials ratio and had initial slump values of 230+_ 5 mm (9.1 +_0.2 in.). The influence of fly ash and silica fume incorporation on slump retention, washout resistance, bleeding, segregation, surface settlement, setting time, compressive and splitting-tensile strength developments was evaluated for the fluid mixtures. The paper summarizes the results of the experimental study that involved the comparison of data obtained from 21 concrete mixtures.
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