Properties of self-compacting concrete containing class F fly ash
Properties of self-compacting concrete containing class F fly ash
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DOI：
10.1016/j.matdes.2010.08.043
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发表时间：
2011-03
影响因子：
8.4
通讯作者：
R. Siddique
中科院分区：
文献类型：
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作者：
R. Siddique
通过试验研究了F级粉煤灰自密实混凝土的性能。混合料由5%的F类粉煤灰配制而成，比例从15%到35%不等。研究的性能包括自密实性参数（坍落度流动、j型环、v型漏斗、l型箱形和u型箱形）、强度参数（抗压和劈裂抗拉强度）和耐久性参数（除冰盐表面结垢、碳化和抗快速氯化物渗透）。SCC混合料的28天抗压强度在30 ~ 35MPa之间，劈裂抗拉强度在1.5 ~ 2.4MPa之间。所有SCC混合料的碳化深度都随龄期的增加而增加。粉煤灰掺量为20%的SCC，最大碳化深度为1.67mm，第90天和第365天分别为1.85mm和1.67mm。同时，观察到所有混合物的pH值均大于11。除掺量为15%时外，除掺量随粉煤灰掺量的增加而增加外，除掺量随粉煤灰掺量的增加而增加外。在365日龄时，粉煤灰添加量在0.525 ~ 0.750kg/m2范围内，其减重效果基本一致。粉煤灰制得的SCC混合料在90天和365天的抗氯离子渗透性都很低，分别小于700和400库仑。
An experimental program was carried out to study the properties of self-compacting concrete (SCC) made with Class F fly ash. The mixes were prepared with five percentages of class F fly ash ranging from 15% to 35%. Properties investigated were self-compactability parameters (slump flow, J-ring, V-funnel, L-box and U-box), strength properties (compressive and splitting tensile strength), and durability properties (deicing salt surface scaling, carbonation and rapid chloride penetration resistance). SCC mixes developed 28day compressive strength between 30 and 35MPa and splitting tensile strength between 1.5 and 2.4MPa. The carbonation depth increased with the increase in age for all the SCC mixes. Maximum carbonation depth was observed to be 1.67mm at 90days and 1.85mm at 365days for SCC with 20% fly ash content. Also, the pH value for all the mixes was observed to be greater than 11. Deicing salt surface scaling weight loss increased with the increase in fly ash content except with mix containing 15% fly ash. At 365days age, the weight loss was almost consistent for all percentages of fly ash varying between 0.525 and 0.750kg/m2. SCC mixes made with fly ash exhibited very low chloride permeability resistance (less than 700 and 400 Coulomb) at the age of 90 and 365days respectively.