Analysis of soil characteristics on expansive clay stabilization using shell ash

Abstract

Expansive clay is one of the problems in construction work. The soil has the characteristics of being easy to expand when exposed to water, causing a decrease in the strength value of the soil. The can be overcome by stabilizing the soil. The soil is formed from weathering and contains the mineral montmorillonite. The soil is very sensitive to moisture content, has a high shrinkage rate, thus interfering in construction work. Therefore, additional materials are needed to overcome the problem, one of which is soil stabilization. The study aimed to stabilize the expansive clay soil. This is done by analyzing the physical and mechanical properties of expansive clay with a shell ash mixture. Expansive clay is taken directly (undisturbed) or disturbed. Undisturbed soil is taken using a tube, so that the soil is not disturbed by outside air, while disturbed soil is taken using a shovel and then put into a sack container. Expansive clay stabilization method lies in adding the percentage of shell ash mixture (5 %, 10 %, 15 %, and 20 %). The soil, the initial moisture content (γd) of which has been determined, is mixed, then molded into a cylindrical shape. The mold was stored in a desiccator, then watered with 5 % water every day until the soil became saturated. Then, using a Proctor test, chemical tests (soil chemical test, soil mineral test), physical tests (soil moisture, Atterberg limit), and mechanical tests (unconfined compression test, compaction test, swelling test) were carried out. The results showed that the addition of an oyster shell ash stabilizing agent to expansive clay affected the physical and mechanical properties of the soil. The addition of shell ash can reduce soil moisture with various plasticity indexes. While the soil stress value decreased, the swelling of the soil increased significantly above the original soil.

Identifying the influence of reinforcement ratio on crack behaviour of rigid pavement

“…However, an unexplored part of the problem is the extent to which variations in the reinforcement ratio can affect the width of flexural cracks, especially when the reinforced concrete slab is subjected to monotonic static loads. While there have been studies evaluating the effect of varying the reinforcement ratio on the stresses generated at the surface of concrete slabs [21], more research is needed to understand this impact in greater depth and how various factors such as reinforcement type, concrete characteristics and slab thickness affect crack behavior.…”

Identifying the microstructure and mechanical properties of expansive soil stabilized using fly ash and waste foundry sand

“…The process of soil stabilization with lime involves the cost of importing, grinding, and distributing lime to the project site so it is not quite easy to use. Expansive soil stabilized using shell ash [5] reported that the addition of shell ash to expansive soil can improve soil chemical properties and achieve better compaction. The soil that needs stabilization possesses a variety of traits, including soil type, clay content, and moisture level.…”