硫酸镁腐蚀环境对水泥土强度的影响
Influence of MgSO4 Corrosive Environment on Strength of Soil Cement
摘 要
环境中的Mg2+和SO2-4对水泥土及其桩体的力学性能具有很大的影响.通过模拟试验的方法探讨了在不同硫酸镁溶液环境下不同浸泡时间水泥土的表观和抗压强度的变化规律得出,水泥土表面腐蚀程度随着腐蚀时间的增长和硫酸镁浓度的增大而增加,水泥土抗压强度随硫酸镁浓度的增大而减小.分析了硫酸镁溶液的Mg2+浓度和SO2-4浓度随时间的变化关系,得出随着时间的增长,Mg2+浓度呈减小趋势,而SO2-4浓度则呈抛物线型.研究认为:水泥土强度改变与环境中的Mg2+浓度和SO2-4浓度密切相关.在此基础上建立了硫酸镁腐蚀环境下考虑Mg2+浓度和SO2-4浓度相互影响的水泥土Q-M,S强度模型,经对比,预测值与实测值比较接近.该关系模型具有一定工程设计参考价值.
抗压强度
腐蚀环境
折减系数
soil cemented
compression
corrosive environment
reduction coefficient
Abstract
The Mg2+ and SO2-4 in corrosive environment may affect the mechanical properties of soil cemented seriously.The effects of solution concentration and immersing duration on the surface corrosive degree and compression strength of soil cemented samples were studied by simulating tests in MgSO4 solutions.The results showed that the corrosive degree of sample surfaces was increasied with the increase of corrosive solution concentration and corrosive time.The compression strength decreased with the increase of solution concentration Mg2+ concentration decreases and the SO2-4 concentration was of parabolal trend with the increase of corrsive time.It is concluded that compression strength is closely related with the Mg2+ and SO2-4 concentration of MgSO4 corrosive environment.A strength model of soil cement called Q-M,S modle is set up based on the relaionship between compression strength and concentration of Mg2+ and SO2-4.The predicted and measured values are close so that the foumula is accurate and the modle could be used in practical design.
中图分类号 TU411 X503
所属栏目 试验研究
基金项目 山西省留学人员回国资助项目(2006-26);高等学校博士点专项基金(20070112003);太原市科技项目(07010779)
收稿日期 2008/5/1
修改稿日期 2008/6/15
网络出版日期
作者单位点击查看
引用该论文: HAN Peng-ju,BAI Xiao-hong,Ren Jie,Wang Mei. Influence of MgSO4 Corrosive Environment on Strength of Soil Cement[J]. Corrosion & Protection, 2009, 30(1): 46～49
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参考文献
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【2】GB 50046-1995,工业建筑防腐蚀设计规范[S].北京:中国计划出版社,1995.
【3】宁宝宽,陈四利,刘斌.水泥土的环境侵蚀效应与破裂过程分析[J].岩石力学与工程学报,2005,24(10):1778-1782.
【4】宁宝宽,金生吉,陈四利.侵蚀性离子对水泥土力学特性的影响[J].沈阳工业大学学报,2006,28(2):178-181.
【5】Rolling R S.Sulfate attach on cement stabilized sand[J].Journal of Geotechnical and Geoenvirtmnlental Engineering,1999,121(5):364-372.
【6】白晓红,赵永强,韩鹏举,等.污染环境对水泥土力学特性影响的试验研究[J].岩土工程学报,2007,29(8):1260-1263.
【7】董晓强,白晓红,赵永强,等.硫酸污染下水泥土的电阻率变化研究[J].岩土力学,2007,28(7):1453-1458.
【8】黄汉盛,鄢泰宁,兰凯.软土深层搅拌桩的水泥土抗侵蚀性室内试验[J].地质科技情报,2005(7):85-88.
【9】GB/T 50123-1999,土工试验方法标准[S].
【2】GB 50046-1995,工业建筑防腐蚀设计规范[S].北京:中国计划出版社,1995.
【3】宁宝宽,陈四利,刘斌.水泥土的环境侵蚀效应与破裂过程分析[J].岩石力学与工程学报,2005,24(10):1778-1782.
【4】宁宝宽,金生吉,陈四利.侵蚀性离子对水泥土力学特性的影响[J].沈阳工业大学学报,2006,28(2):178-181.
【5】Rolling R S.Sulfate attach on cement stabilized sand[J].Journal of Geotechnical and Geoenvirtmnlental Engineering,1999,121(5):364-372.
【6】白晓红,赵永强,韩鹏举,等.污染环境对水泥土力学特性影响的试验研究[J].岩土工程学报,2007,29(8):1260-1263.
【7】董晓强,白晓红,赵永强,等.硫酸污染下水泥土的电阻率变化研究[J].岩土力学,2007,28(7):1453-1458.
【8】黄汉盛,鄢泰宁,兰凯.软土深层搅拌桩的水泥土抗侵蚀性室内试验[J].地质科技情报,2005(7):85-88.
【9】GB/T 50123-1999,土工试验方法标准[S].
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