Research on indoor experiment of weathered fine sand modified expansive soil swelling
Abstract：Based on the defects of expansive soil chemical modification methods, a physical improvement meth- od mixing weathered fine sand with expansive soil is proposed. Weathered fine sand mixed with different pro- portions of expansive soil, expansibility index and shrinkage index experiments have been made, and the influ- ence of different sand ratios on expansive soil expansibility indexes and shrinkage indexes has been concluded. Analyzing expansibility and shrinkage characteristics of expansive soil of different proportions of dope fine sand data, the doped sand is effective to inhibit the expansion and contraction of expansive soil. With the increasing in the proportion of doped sand, expansibility indexes and shrinkage indexes are both decreasing. When the incorporation of a weathered fine sand ratio reached 10% , the influence on the swell-shrinking index is the most significant. The swell-shrink total ratio is 0.67% and the free expansion rate is 31% , achieving the standard of roadbed filler. In the comprehensive economic and practical view, the optimum mix proportion of weathered fine sand is 10%.
Keywords：expansive soilweathered fine sandexpansibility indexshrinkage index
Publication Date：2012-01-01
Online Publishing Date：2025-08-15(First online date of this platform, not the publication date of the document)
Pages：6( 734-739 )