海水浸泡下水泥土强度衰减室内试验研究

发布时间：2018-01-11 09:28

本文关键词：海水浸泡下水泥土强度衰减室内试验研究　出处：《中南大学学报(自然科学版)》2017年01期 　论文类型：期刊论文

【摘要】：通过对不同浸泡时间和不同水泥掺入比的水泥土进行微型贯入试验、X线衍射(XRD)试验、扫描电子显微镜(SEM)试验及化学分析试验研究一维浸泡试验中水泥土的强度衰减过程和劣化机理。研究结果表明:水泥土的劣化深度随海水浸泡时间的增长逐渐增大,随水泥掺入比的增大逐渐减小。对于浸泡360 d的水泥土,水化产物C—S—H的峰值随着深度的增大而增大,与水泥土强度变化趋势一致。在0~10 mm深度区域内,水泥土的孔隙增多,孔径增大,Ca质量分数明显降低,在10 mm以下部分纤维状及网状的生成物增多,出现明显的絮凝现象。水泥土试样由浅到深,Ca~(2+),SO_4~(2-)和CO_3~(2-)的质量分数呈增大趋势,Mg~(2+),Cl~-和HCO_3~-的质量分数呈减小趋势。
[Abstract]:The micro-penetration test of cement-soil with different soaking time and different mixing ratio of cement was carried out by X-ray diffraction (XRD) test. Scanning electron microscope (SEM). The strength attenuation process and degradation mechanism of cement soil in one-dimensional immersion test were studied by experiments and chemical analysis. The results showed that the degradation depth of cement soil increased with the increase of seawater immersion time. The peak value of hydration product C-S-H increases with the increase of depth for the cement soil soaking for 360 days. The change trend of cement soil strength is consistent with that of cement soil. In the depth of 0 ~ 10 mm, the porosity of cement soil increases and the mass fraction of Ca decreases with the increase of pore size. When the number of fibrous and reticular products increases below 10 mm, there is obvious flocculation. The sample of cement soil is from shallow to deep. The mass fractions of so _ 4 / C _ 2) and CO _ 3 / C _ 2) are on an increasing trend. The mass fractions of mg ~ (2) C _ (2) and HCO _ (3) are decreasing.
【作者单位】：中国海洋大学海洋环境与生态教育部重点实验室;中国海洋大学环境科学与工程学院;
【基金】：国家自然科学基金资助项目(50779062)~~
【分类号】：TU411
【正文快照】： 水泥土加固体具有整体性强、设计灵活、施工方便、噪音小、造价低和对加固地基产生较小的附加沉降等优点,被广泛应用于建(构)筑物地基、抗液化加固、边坡稳定、防渗工程、人工岛填、路基加固等工程中[1-4]。以水泥土为代表的地基处理方法在我国东南沿海地区的滨海相沉积软土、

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