Effect of Drying on the Index Properties of Lateritic Soils

Abstract

Due to significant variation in geological and climatic conditions the characteristics of lateritic soils vary from place to place. Because of the prevailing climatic conditions, the laterites and lateritic soils of a particular region may be different from those found in other parts of the world. Some investigators report that the pretest drying has significant effect on the properties of soils. In such studies the authors associate the effect of drying on the properties of soils due to the mineralogy of soil. From this context there is a need to investigate the effect of sample preparation on lateritic soils prior to testing. In the present study lateritic soils from different sources in west coast region of India were studied to investigate the effect of drying on their index properties. Due to pretest drying it is observed from the results that there is a significant change in Atterberg limits and other properties of soils tested. These changes are attributed due to aggregation of particles. The observed changes are found to be permanent.

Rheological properties of halloysite soil slurry: a case study of weathered tephra involved in a shallow landslide triggered by the 2018 Eastern Iburi earthquake in Hokkaido, Japan

“…The bulk sample was sieved by straining with a rubber spatula to prepare slurries with particles < 425 μm, which is equivalent to the size fraction for soil mechanical testing. As the material properties of soil vary with heating and drying (e.g., Terzaghi et al 1996;Sunil and Krishnappa 2012;Huvaj and Uyeturk 2018), two types of slurry were examined: one prepared from soil dried at 40 ℃ in an oven (water content of 5.2 wt%), and another made using moist soil that was not allowed to dry between sampling and slurry Kameda et al 2019). Weathered tephra samples were collected from the clay layer in the Ta-d layer that is in contact with the underlying Neogene sedimentary rock.…”

Effect of Pre-Test Drying Temperature on the Properties of Lateritic Soils.

“…Compared with lateritic soil tested at NMC, the SG of the three genetically different lateritic soils were lower and decreased as the drying temperature increases from air to oven drying at 110 • C. The difference is, however, not significant. Sunil and Krishnappa [22] studied "the influence of drying on the properties of lateritic soils and observed that the SG of the air and oven dried lateritic soils did not vary significantly from each other. At NMC and all the pretest drying temperatures, the average SG of charnockite-derived lateritic soil is higher compared to the other lateritic soils.…”

The Applicability of Disintegration Tests for Cohesive Organic Soils

“…These investigations show that a higher drying temperature leads to an accumulation of fine particles with organic and to larger grains with decreasing specific surface area (Mikutta et al 2005). There is also an irreversible dehydration process of the clay particles causing cementation of fine particles which are then not dispersed (Sunil, Krishnappa 2012). These effects can even be detected in a standard grainsize analysis.…”

“…Some of the samples needed to be dried, which seems to have a considerable influence on the aggregate stability, particularly for the fine-grained, organic materials. The influence of the drying temperature in soil sample preparation on the aggregation has already been investigated by different researchers (Basma et al 1994;Sunil, Krishnappa 2012). These investigations show that a higher drying temperature leads to an accumulation of fine particles with organic and to larger grains with decreasing specific surface area (Mikutta et al 2005).…”