Study on effect of laboratory roller compaction on unconfined compressive strength of lime treated soils

Abstract

Expansive soils are problematic due to their swell—shrinkage behavior and low compressive strength. They are modified generally with additives such as lime, fly ash, and various other inorganic and organic materials. Chemical stabilization treatments can improve expansive soil properties for its reuse in geotechnical applications. The present study investigates the properties of two types of subgrade soil treated with Lime and compacted by three different methods in the laboratory. The study is mainly focused to bring out the effect of different methods of compaction on the unconfined compressive strength of Lime treated soils and untreated soils. Laboratory investigation included pH, Atterberg limits, cation exchange capacity (CEC), compaction, unconfined compression strength (UCS), California Bearing Ratio (CBR), Scanning Electron Micrographs (SEM) and EDAX before and after lime treatment. Tests were performed on lime treated soils (2, 4, 6 and 8% of lime). The soil samples for unconfined compressive strength test were prepared by static, dynamic and roller compaction methods in the laboratory. Roller compaction was performed using indigenously fabricated Roller compactor cum Rutting Analyzer (RCRA). The results indicate that dry unit weight and UCS of roller compacted lime treated soil is lower than that of dynamic compacted soil. However, dry unit weight and UCS of lime treated roller compacted soil are closer to that of statically compacted soil. Cation exchange capacity of both soils before and after treatment with lime were examined, CEC reduced with increase in lime content.

Avaliação de propriedades de resistência de um solo residual argilo-siltoso estabilizado com cimento e cal

“…Normalmente, os teores de cal utilizados variam de 2 a 4% em peso, em relação ao peso do solo seco. Nagesh et al (2021) em um estudo com solos argilosos encontrou a melhor resistência quando adicionou teor de calde 6%. Outro benefício encontrado na pesquisa, foi em relação a compactação, onde se encontrou que após a introdução de cal houve um aumento no teor de umidade ideal e uma diminuição no peso unitário seco máximo, tornando o solo adequado para faixas de teor de água mais elevadas.…”

Accounting for Expansive Soil Movement in Geotechnical Design—A State-of-the-Art Review

“…In Walsh's method, the edge distance (e) and differential mound movement (ym) across a foundation are used to define the mound shape, with flat mounds having parabolic edges, as shown in Figure 15, where ym can be considered as 0.5ys and 0.7ys for the edge heave and centre heave, respectively [75]. Likewise, different values of edge distances (m) are given for edge heave and centre heave, as shown in respective Equations (37) and (38).…”

“…Although the engineering properties of expansive soils can be improved by various techniques [32][33][34][35][36][37][38][39][40], to ensure safer, more resilient, and sustainable designs of geotechnical structures, it is vital to better understand the interactions among expansive soils, atmospheric boundaries, vegetations (if present), and structures. Hence, this review aims to explore different factors that affect the performance of lightweight structures built on expansive soils, highlighting the extent of the problems and the state of the art in current research and industry practice.…”