Influence of Allophane Content on the Physical Properties for Volcanic Cohesive Soil

Abstract

Relationship between allophane content and physical properties for volcanic cohesive soil was investigated. The main results are as follows 1. Allophane clay minerals are the main factor for forming ped structures. 2. Acid dispersion is more effective than alkali dispersion when the allophane content is above 50%. 3. Natural water content, liquid limit, non-free water content and natural void ratio increasing linearly with allophane content respectively. 4. Volcanic cohesive soil lies below A-line in plasticity chart and fall more far from the A-line with increasing allophane content. The soil has its characteristic linear line in the chart. 5. Compacted dry density decreases linearly with increasing allphane content.