黄河三角洲改性含盐水泥土搅拌桩耐久性研究

CUI Xin-zhuang,ZHANG Na,WANG Cong,CHE Hua-qiao,ZHOU Ya-xu

Jianzhu Cailiao Xuebao/Journal of Building Materials（2013）

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Abstract

通过室内试验,研究了黄河三角洲含盐水泥土的劣化规律以及粉煤灰和矿渣微粉对其劣化的抑制效应,并利用X射线衍射(XRD)和扫描电镜(SEM)对劣化机理及外加剂的改性机理进行了分析.结果表明:地下盐水环境对黄河三角洲水泥土有较强的腐蚀作用,其90,180 d龄期的抗压强度分别降低了18.5％,21.6％；掺加粉煤灰对黄河三角洲含盐水泥土的早期强度不利,但其后期强度会持续增加；掺加矿渣微粉对黄河三角洲含盐水泥土强度有明显的提升作用,并对其劣化有显著的抑制作用.为防止黄河三角洲含盐水泥土劣化,工程中建议用粉煤灰和矿渣微粉等质量替代60％的水泥,而且矿渣微粉掺量不少于40％.

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Key words

durability,Yellow River delta,mixing piles,modified salty soil-cement

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