中文摘要：

为研究不同pH值条件下桂林改良红粘土的工程性质,通过控制不同溶液酸碱度、水泥、粉煤灰掺量、浸泡时间来进行液、塑限联合测定法、自由膨胀率试验研究。研究结果表明,桂林红粘土液、塑限受水泥掺量影响最大且呈正相关关系,掺灰红粘土液、塑限与粉煤灰掺量、pH值呈负相关关系,塑性指数与龄期总体呈负相关,自由膨胀率与溶液pH值大体呈正相关关系,与水泥掺量呈负相关关系,掺灰红粘土自由膨胀率总体上随浸泡时间呈递增趋势。主要原因是不同酸碱环境下掺入物与红粘土物理化学反应使颗粒之间连接、排列方式、空间结构改变,导致结合水膜厚度改变所致。

英文摘要：

In order to study the engineering properties of the red clay in Guilin under different p H values. With designing different cement,fly ash content,curing time and different p H values,the liquid and the plastic limit and free expansion rate were studied in this paper. The results showed that the maximum of the liquid and plastic limit of the red clay influenced by cement content most,and have positive correlation with it,the liquid and plastic limit of the red clay combined with fly ash have negative correlation with the fly ash content、p H value,in general,the plastic index was negatively correlated with the curing time. The free expansion rate was positively correlated with the p H value of the solution broadly and negatively correlated with cement content,generally speaking,the free expansion rate of the red clay combined with fly ash have positive correlation with the curing time. The reason is that the physical and chemical reactions between cement、fly ash and red clay under different acid and alkali conditions make the connection、arrangement and the spatial structure between the particles change,and then lead to the change of the thickness of the water film.