A platform for research: civil engineering, architecture and urbanism
A platform for research: civil engineering, architecture and urbanism
Effect of Impact Loading on the Crushability Behavior of Micaceous Sand
The presence of mica adversely alters the mechanical characteristics of cohesionless soil. Due to their elastic nature, mica flakes deform under loading and recover when the load is removed. This results in undesirable behavior when micaceous sand is used as highway subgrades where repeated impact loading occurs due to moving traffic. Thus, it is inevitable to study the effect of impact loading on the crushability of mica particles to properly design highways dealing with micaceous soil. This paper discusses the effect of impact loading on the crushability, hydraulic conductivity, and microstructure properties of micaceous sand. The experimental results of micaceous sand with 30% mica showed an increase in the maximum dry density and a decrease in optimum moisture content with an increase in impact loading cycles. The hydraulic conductivity of the soil showed an exponential decrease with higher impact loading cycle. From the SEM analysis, it is evident that the mica flakes were crushed, and their intact layer thickness was reduced with repeated loading cycles. It was in accordance with the grain size distribution curves also showcasing an increased percentage of fine content. These microstructural changes caused a decrease in the hydraulic conductivity and an increase in the maximum dry density of the micaceous sand due to the decrease in bridging and ordering of the mica flakes with successive loading cycles.
Effect of Impact Loading on the Crushability Behavior of Micaceous Sand
The presence of mica adversely alters the mechanical characteristics of cohesionless soil. Due to their elastic nature, mica flakes deform under loading and recover when the load is removed. This results in undesirable behavior when micaceous sand is used as highway subgrades where repeated impact loading occurs due to moving traffic. Thus, it is inevitable to study the effect of impact loading on the crushability of mica particles to properly design highways dealing with micaceous soil. This paper discusses the effect of impact loading on the crushability, hydraulic conductivity, and microstructure properties of micaceous sand. The experimental results of micaceous sand with 30% mica showed an increase in the maximum dry density and a decrease in optimum moisture content with an increase in impact loading cycles. The hydraulic conductivity of the soil showed an exponential decrease with higher impact loading cycle. From the SEM analysis, it is evident that the mica flakes were crushed, and their intact layer thickness was reduced with repeated loading cycles. It was in accordance with the grain size distribution curves also showcasing an increased percentage of fine content. These microstructural changes caused a decrease in the hydraulic conductivity and an increase in the maximum dry density of the micaceous sand due to the decrease in bridging and ordering of the mica flakes with successive loading cycles.
Effect of Impact Loading on the Crushability Behavior of Micaceous Sand
Lecture Notes in Civil Engineering
Satyam, Neelima (editor) / Singh, A. P. (editor) / Dixit, Manish S. (editor) / Anjali, S. (author) / Seethalakshmi, P. (author)
Indian Young Geotechnical Engineers Conference ; 2021 ; Chennai, India
2024-11-29
10 pages
Article/Chapter (Book)
Electronic Resource
English
| British Library Online Contents | 2018
Unstable behaviour of model Jamuna micaceous sand
| British Library Online Contents | 2010