Soil Stabilization

Mechanical and Chemical Soil Stabilization.

1. Mechanical and Chemical Soil Stabilization Final Project Presentation Submitted By: Ammar Aldabbour  - 1810304 Rashed Hijazeen  - 1810004 Mohammad Walid - 1810340

2. DEFINITION  Soil stabilization is a process of treating the soil in such a manner as to maintain, alter, or improve the performance of the soil as a road construction material. The changes in the soil properties are brought about either by the incorporation of additives or by the mechanical blending of different soil types. There are many techniques for soil stabilization, including compaction, dewatering, and adding material to the soil.

3. PURPOSE OF SOIL STABILIZATION  To improve the strength of sub-bases, bases, and sometimes surface courses, in case of low-cost roads. To bring about the economy at the cost of the road. To make use of inferior quality of locally available soils/material. ( every time it is not possible to find required or specified strength in locally available material at that time we can go for soil stabilization methods). To improve certain undesirable properties of soils, such as excessive swelling or shrinkage, high plasticity, difficulty in compacting, etc. To facilitate compaction and increase load-bearing capacity. To reduce compressibility and thereby settlements. To improve permeability characteristics. 

4. 1. SOIL COMPONENTS OF STABILIZATION

5. COMPONENTS OF STABILIZATION 2. STABILIZING AGENT       A. Cement       B. Lime       C. Fly Ash       D. Blast Furnace Slag

6. STAGES INVOLVED IN SOIL STABILIZATION PROCESS Evaluating the properties of the given soil. Deciding the lacking property of soil and choose an effective and economical method of soil stabilization. Designing the Stabilized soil mix for intended stability and durability values.

7. MECHANICAL STABILIZATION In this technique, the stability of soil is increased by blending the available soil with imported soil or aggregate to obtain a desired particle-size distribution, and by compacting the mixture to the desired density. Compacting a soil at an appropriate moisture content is itself a form of mechanical stabilization.

8. PRINCIPLE OF MECHANICAL STABILIZATION Mechanical stabilization is achieved by intelligently blending locally occurring material to obtain the desired grading. compaction of soil is also a form of Mechanical stabilization. (It is well known as a dense, well-graded mass offers high resistance to lateral displacement under a load). If well-graded material is compacted, the densification of the mass takes place. The mechanical strength of mass is due to internal friction and cohesion. (internal friction is supplied by the coarser particles gravels, sand, silts whereas cohesion is due to the clay friction).

9. APPLICATION OF PRINCIPLE OF MECHANICAL STABILIZATION Soil-Aggregate mixture. Sand-Clay mixture. Sand-Gravel mixture. Stabilization of soil with soft aggregate.

10. CHEMICAL STABILIZATION Under this category, soil stabilization depends mainly on chemical reactions between stabilizer (cementitious material) and soil minerals (pozzolanic materials) to achieve the desired effect.

11. DIFFERENT TECHNIQUES OF SOIL STABILIZATION Soil-Lime mixture. Soil-Cement mixture. Chloride stabilization.

12. ADVANTAGES OF SOIL STABILIZATION It improves the strength of the soil, thus, increasing the soil bearing capacity. It is more economical both in terms of cost and energy to increase the bearing capacity of the soil rather than going for a deep foundation or raft foundation. It is also used to provide more stability to the soil in slopes or other such places. Sometimes soil stabilization is also used to prevent soil erosion or formation of dust, which is very useful especially in dry and arid weather. Stabilization is also done for soil water-proofing; this prevents water from entering into the soil and hence helps the soil from losing its strength. It helps in reducing the soil volume change due to a change in temperature or moisture content. Stabilization improves the workability and the durability of the soil.

13. THANKS!