[1]蔡光华,刘松玉,杜延军,等.不同活性氧化镁碳化粉土对比试验[J].东南大学学报(自然科学版),2015,45(5):958-963.[doi:10.3969/j.issn.1001-0505.2015.05.024]
 Cai Guanghua,Liu Songyu,Du Yanjun,et al.Comparative experiments on carbonated silts treated by magnesia with different activity[J].Journal of Southeast University (Natural Science Edition),2015,45(5):958-963.[doi:10.3969/j.issn.1001-0505.2015.05.024]
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不同活性氧化镁碳化粉土对比试验()
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《东南大学学报(自然科学版)》[ISSN:1001-0505/CN:32-1178/N]

卷:
45
期数:
2015年第5期
页码:
958-963
栏目:
土木工程
出版日期:
2015-09-20

文章信息/Info

Title:
Comparative experiments on carbonated silts treated by magnesia with different activity
作者:
蔡光华刘松玉杜延军郑旭曹菁菁
东南大学岩土工程研究所, 南京210096; 东南大学江苏省城市地下工程与环境安全重点实验室, 南京210096
Author(s):
Cai Guanghua Liu Songyu Du Yanjun Zheng Xu Cao Jingjing
Institute of Geotechnical Engineering, Southeast University, Nanjing 210096, China
Jiangsu Key Laboratory of Urban Underground Engineering and Environmental Safety, Southeast University, Nanjing 210096, China
关键词:
氧化镁 活性 碳化 强度 微观特性
Keywords:
magnesia activity carbonation strength micro-characteristics
分类号:
TU472
DOI:
10.3969/j.issn.1001-0505.2015.05.024
摘要:
通过室内碳化试验研究了氧化镁(MgO)活性对碳化加固粉土物理化学、力学和微观特性的影响,并且将所测强度与水泥固化粉土进行了对比. 结果表明,碳化后高活性MgO-A试样温度为58 ℃,低活性MgO-B试样温度为50 ℃左右,且MgO-B试样碳化后存在裂缝. 碳化试样强度随MgO掺量和碳化时间的增加而增加,在相同条件下MgO-A试样强度高于MgO-B试样强度和28 d水泥固化土强度. MgO-A试样密度增加率较大;碳化土pH值随碳化时间的增加而减小,MgO-A碳化土的pH值较MgO-B碳化土低. MgO-A碳化试样产生的棱柱状水碳镁石晶体和片状水菱镁石/球碳镁石数量较多,碳化产物促进试样强度提高和孔隙数量减少. 在相同条件下用高活性MgO比低活性MgO更利于粉土的碳化加固.
Abstract:
Laboratory carbonation tests were performed to investigate the influence of magnesia(MgO)activity on the physicochemical, mechanical, and micro-characteristics of carbonated MgO-stabilized silty soils, and the tested strength was compared with that of cement-stabilized silty soils. The results indicate that after carbonation, the temperature of the high-activity MgO-A-stabilized samples is 58 ℃ while that of the low-activity MgO-B-treated specimens is about 50 ℃, and there exist some cracks in the MgO-B-treated samples after carbonation. The unconfined compressive strength of carbonated specimens increases with the increase of the MgO content and the carbonation time. Under the same conditions, the unconfined compressive strength of the carbonated MgO-A stabilized specimens is higher than those of the carbonated MgO-B stabilized specimens and 28 d cement-treated silts. The density increment ratios the of MgO-A-stabilized samples are higher. The soil pH of the carbonated samples decreases with the increase of the carbonation time, and the pH values of the MgO-A-treated samples are lower than those of MgO-B-treated samples. The number of prismatic nesquehonite and flake dypingite/hydromagnesite formed in the MgO-A stabilized soils is larger, and these carbonation products facilitate the improvement in strength and the reduction in porosity. Under the same condition, high-activity MgO is better than low-activity MgO for the strength development of carbonated MgO-stabilized silts.

参考文献/References:

[1] 刘松玉, 钱国超, 章定文. 粉喷桩复合地基理论与工程应用[M]. 北京: 中国建筑工业出版社, 2006:18-21.
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备注/Memo

备注/Memo:
收稿日期: 2015-03-06.
作者简介: 蔡光华(1985—),男,博士生;刘松玉(联系人),男,博士,教授,博士生导师,liusy@seu.edu.cn.
基金项目: 国家自然科学基金资助项目(51279032)、 “十二五”国家科技支撑计划资助项目(2012BAJ01B02-01)、中央高校基本科研业务费专项资金资助项目、江苏省普通高校研究生科研创新计划资助项目(KYLX_0147).
引用本文: 蔡光华,刘松玉,杜延军,等.不同活性氧化镁碳化粉土对比试验[J].东南大学学报:自然科学版,2015,45(5):958-963. [doi:10.3969/j.issn.1001-0505.2015.05.024]
更新日期/Last Update: 2015-09-20