大掺量高性能混凝土的抗氯离子渗透特性

Resistance to the Penetration of Chloride Ions of High Performance Concrete with High Volume Mineral Admixture

研究了在固定用水量为130 kg/m3下粉煤灰、磨细矿渣和硅灰对水泥替代量为30%、50%、70%、水胶比为0.33的高性能混凝土的抗氯离子渗透特性。研究结果表明,在低水胶比情况下,粉煤灰、磨细矿渣和硅灰大掺量复掺的高性能混凝土具有最佳的抗氯离子渗透能力,普通混凝土的抗氯离子渗透能力最差,对于单掺粉煤灰的高性能混凝土,随粉煤灰掺量增加,混凝土的抗氯离子渗透能力增强,但当掺量在50%以上时,混凝土的抗氯离子渗透能力明显下降。

The resistance to the penetration of chloride ions of high-performance concrete with the replacement of fly ash,granulated blast furnace slag,and silica fume alternative to the weight of cement（30%,50% and 70%）,water-binder ratio of 0.33 was studied under the condition of water consumption of 130 kg/m3.The results show that the common concrete has the bad property of the resistance to the penetration of chloride ions.With the cement replacement by fly ash,silica fume and granulated blast-furnace slag,it is effective in improving the resistance to the penetration of chloride ions of concrete.And it is not obvious effective on the resistance to the penetration of chloride ions concrete with larger than 50% cement replacement by fly ash.