The effects of the use of silica fume (SF) and fly ash (FA) on the fresh, mechanical and durability properties of self-compacting concrete (SCC) were experimentally examined. Combinations of F-class FA ranging from 15 to 45% and SF ranging from 5 to 15% were replaced for Ordinary Portland. The effects of FA and SF replacement on fresh concrete parameters (slump flow, L-box, V-funnel and U-box), mechanical properties (compressive and flexural strength) and durability properties (capillary water permeability, and rapid chloride ion permeability) were investigated.

Test results showed that, replacement of cement with SF and by up to 30% FA increased mechanical properties of SCC series at 28 and 180 days, compared to the control group. With increased amounts of FA in SCC mixtures, however, a decrease in the compressive and flexural strengths was observed. The increased ratios of FA and SF in SCC mixtures significantly decreased the rapid chloride permeability and water absorption values of concrete in 180 days. Especially, in SCC mixtures prepared with FA, very low chloride permeability resistance was obtained at 180 days. The lowest chloride permeability resistance was observed to be 345 Coulomb at 180 days for SCC with 45% FA content. Minimum sorptivity coefficient was obtained as 0.062 mm/min^0.5 at 180 days for SCC with 15% SF content. Although the sorptivity coefficients of the FA-containing mixtures decreased on the 180th day compared to the control sample, these values were higher than the reference sample on the 28th day. Therefore, it may be misleading to take the 28th day sorptivity coefficient values as a basis for mixtures containing FA. The results showed that the curing time had a significantly effect on the sorptivity coefficient of the FA-added mixtures. Also, unlike the SF-added SCC mixtures, no obvious correlation was found between the compressive strength and sorptivity coefficient of the FA-added mixes.

通过实验研究了使用硅粉 (SF) 和粉煤灰 (FA) 对自密实混凝土 (SCC) 的新鲜、机械和耐久性性能的影响。普通波特兰取代了 15% 至 45% 的 F 级 FA 和 5% 至 15% 的 SF 的组合。FA 和 SF 置换对新拌混凝土参数（坍落度流、L 型箱、V 型漏斗和 U 型箱）、机械性能（抗压和抗弯强度）和耐久性性能（毛细管透水率和快速氯离子渗透率）的影响被调查。

测试结果表明，与对照组相比，用 SF 和高达 30% 的 FA 替代水泥可提高 SCC 系列在 28 天和 180 天的力学性能。然而，随着 SCC 混合物中 FA 量的增加，观察到压缩和弯曲强度降低。SCC 混合物中 FA 和 SF 比例的增加显着降低了混凝土在 180 天内的快速氯化物渗透率和吸水率值。特别是，在用 FA 制备的 SCC 混合物中，在 180 天时获得了非常低的氯化物渗透阻力。对于含 45% FA 的 SCC，观察到最低的氯化物渗透阻力在 180 天时为 345 库仑。获得的最小吸附系数为 0.062 mm/min ^0.5SF 含量为 15% 的 SCC 为 180 天。尽管与对照样品相比，含 FA 混合物的吸附系数在第 180 天下降，但这些值在第 28 天高于参考样品。因此，将第 28 天的吸附系数值作为含 FA 混合物的基础可能会产生误导。结果表明，固化时间对加入 FA 的混合物的吸附系数有显着影响。此外，与添加 SF 的 SCC 混合物不同，添加 FA 的混合物的压缩强度和吸附系数之间没有发现明显的相关性。