自然科学版 英文版
自然科学版 英文版
自然科学版 英文版
自然科学版 英文版
英文版编委
自然科学版 英文版
英文版首届青年编委

您目前所在的位置:首页 - 期刊简介 - 详细页面

中南大学学报(自然科学版)

Journal of Central South University

第48卷    第1期    总第269期    2017年1月

[PDF全文下载]    [Flash在线阅读]

    

文章编号:1672-7207(2017)01-0191-12
海水浸泡下水泥土强度衰减室内试验研究
闫楠1, 2,杨俊杰1, 2

(1. 中国海洋大学 海洋环境与生态教育部重点实验室,山东 青岛,266100;
2. 中国海洋大学 环境科学与工程学院,山东 青岛,266100
)

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,Ca2+,SO42-和CO32-的质量分数呈增大趋势,Mg2+,Cl-和HCO3-的质量分数呈减小趋势。

 

关键词: 水泥土;强度衰减;海水环境;海相软土;微型贯入试验

Experimental study on strength deterioration process of cement stabilized soil with seawater immersion
YAN Nan1, 2, YANG Junjie1, 2

1. Key Laboratory of Marine Environment and Ecology, Ministry of Education, Ocean University of China, Qingdao 266100, China;
2. College of Environmental Science and Engineering, Ocean University of China, Qingdao 266100, China

Abstract:Micro cone penetration tests, X-ray diffraction (XRD) phase tests, scanning electron microscope (SEM) tests and chemical component analysis tests were conducted to simulate and study the strength degradation process and deterioration mechanism of cement stabilized soil with different cement ratios and different curing time in marine environment. The results show that the deterioration depth of cement stabilized soil increases with the increase of time and decreases with the increase of cement ratio. As for the cement stabilized soil immerses in seawater for 360 d, the peak value of C—S—H increases with the increase of depth, and it is consistent with the change trend of strength of cement stabilized soil. The porosity and their apertures increase at the depth of 0-10 mm. At the same time, the mass fraction of Ca decreases obviously. The fibrous and mesh chemical products in the sample link the soil particles together, and flocculation phenomenon appears obviously below the depth of 10 mm. The mass fractions of calcium ions, sulfate ions and carbonate ions in the cement stabilized soil have a tendency to decrease from deep to shallow. However, the mass fractions of magnesium ions, chloride ions and bicarbonate ions gradually decrease with the increase of depth.

 

Key words: cement stabilized soil; strength deterioration; seawater environment; marine soft soil; micro cone penetration test

中南大学学报(自然科学版)
  ISSN 1672-7207
CN 43-1426/N
ZDXZAC
中南大学学报(英文版)
  ISSN 2095-2899
CN 43-1516/TB
JCSTFT
版权所有:《中南大学学报(自然科学版、英文版)》编辑部
地 址:湖南省长沙市中南大学 邮编: 410083
电 话: 0731-88879765(中) 88836963(英) 传真: 0731-88877727
电子邮箱:zngdxb@csu.edu.cn 湘ICP备09001153号