| 摘要: |
| 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90，180d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%. |
| 关键词: 黄河三角洲 改性含盐水泥土 搅拌桩 耐久性 |
| DOI：10.3969/j.issn.1007 9629.2013.03.018 |
| 分类号: |
| 基金项目: |
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| Durability of Salty Soil Cement Mixed Pile in the Yellow River Delta |
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CUI Xin zhuang, ZHANG Na, WANG Cong, CHE Hua qiao, ZHOU Ya xu
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School of Civil Engineering, Shandong University, Jinan 250061, China
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| Abstract: |
| A series of tests were carried out to study the deterioration of soil cement in the Yellow River delta, and the suppression effect of different additives(fly ash, GGBS(ground granulated blast furnace slag)) on the soil cement deterioration. X ray diffraction analyzer and scanning electron microscopy(SEM) were employed to study the deterioration mechanism of the soil cement and the modification mechanism of additives material. Results indicate that the underground salt water is significantly corrosive to soil cement. Compared with the normal soil cement, the compressive strength of salty soil cement was 18.5% lower after 90days and 21.6% lower after 180days. With the addition of fly ash, the initial strength of salty soil cement decreases, however, the long term strength increases gradually. GGBS can significantly increase the strength and enhance the ability of restraining deterioration of salty soil cement. It is suggested that replacement of 60% Portland cement by fly ash and GGBS, with the amount of GGBS not less than 40%, can form an employable material, which is able to effectively prevent the deterioration of salty soil cement. |
| Key words: Yellow River delta modified salty soil cement mixing piles durability |
