南宁膨胀土化学改良的路用性能试验研究  

Research on Road Performance of Chemical Modified Expansive Soil in Nanning

作　　者：唐咸远[1] 李迎春 罗得把 

机构地区：[1]广西科技大学土木建筑工程学院,柳州市545006 [2]广西交通规划勘察设计研究院,南宁市530011

出　　处：《公路》2015年第2期169-174,共6页Highway

基　　金：国家自然科学基金资助项目;项目编号51009030;广西交通科技项目;项目编号2011-20

摘　　要：为研究膨胀土的化学改良效果,以南宁膨胀土为对象,在分析膨胀土基本工程特性的基础上,分别用石灰、水泥及粉煤灰作为改良剂对3种不同路段膨胀土进行改良试验,通过试验分析各种改良材料对本路段内膨胀土的改良效果及适应性。研究表明:掺石灰对膨胀土强度的增长和胀缩性指标的降低效果显著,当掺量为5%、7%时均能满足CBR值大于3%且胀缩总率小于0.7%的规范要求;掺水泥对增长膨胀土强度效果显著,但对降低胀缩性指标效果较差;掺粉煤灰对增大CBR不明显。In order to study the chemical modified effects of expansive soil, Nanning expansive soils is taken as study object, the lime, cement and fly ash are utilized as modifier to treat three different types of expansive soil. The fundamental engineering properties of expansive soil are analyzed to evaluate the improved effects and adaptability. The results indicate that it is significant to increase the strength of expansive soil and reduce the swelling-shrinkage properties with the addition of lime＇ with 5% and 7% addition of lime, the CBR value and total rate of swelling-shrinkage can meet with specifications of being more than 3% and less than 0. 7% respectively. Adding cement can obviously increase the strength of expansive soil, but cannot reduce the total rate of swelling-shrinkage significantly, and fly ash is not effective to increase the CBR value.

关 键 词：膨胀土 化学改良 石灰 水泥 粉煤灰 

分 类 号：U414.03[交通运输工程—道路与铁道工程]