Soil Stabilisation using cement
Download as PPTX, PDF14 likes4,030 views
This document discusses soil stabilization using cement. It describes how cement is used to stabilize soils by mixing pulverized soil with Portland cement and water. Factors that affect soil cement stabilization include soil type, cement quantity, water quantity, and mixing/compaction/curing methods. Benefits are that cement is widely available and cost effective, while producing durable and weather resistant materials. Experiments analyzed how unconfined compressive strength increases with higher cement content and lower porosity. Testing methods and results are presented, concluding that cement effectively stabilizes soils and maintains strength even when saturated.
Soil Stabilisation using cement
- 1. SOIL STABILIZATION USING CEMENT Department of Civil Engineering 116/07/2014
- 2. OVERVIEW INTRODUCTION PRESENT STUDY FACTORS AFFECTING SOIL CEMENT STABILIZATION ADVANTAGES DISADVANTAGES EXPERIMENTAL PROGRAM METHODS RESULT AND ANALYSIS CONCLUSION REFERENCES Department of Civil Engineering 216/07/2014
- 3. INTRODUCTION Stabilization is the improvement of a soil or pavement material usually through the addition of a binder or additive. A wider range of soils can be improved for bulk fill applications and for construction purposes. The most common method of stabilization involves the incorporation of small quantities of binders, such as cement, to the aggregate. As a stabilizing material cement is well researched, well understood and its properties clearly defined. Department of Civil Engineering 316/07/2014
- 4. Department of Civil Engineering 416/07/2014
- 5. Department of Civil Engineering 516/07/2014
- 6. PRESENT STUDY Cement stabilization of soil is done by mixing pulverized soil and Portland cement with water and compacting the mix to attain a strong material. The material obtained by mixing soil and cement is known as soil-cement. Since 1915 more than 1 lakh miles of equivalent 7.5m wide pavement bases has been constructed from cement stabilized soils. Department of Civil Engineering 616/07/2014
- 7. Cont. Cement-stabilized materials generally fall into two classes - Soil-Cement Cement- Modified Soil Soil cement is a mixture of pulverized soil material and cement. cement modified soil is a soil treated with small proportion of soil cement. Department of Civil Engineering 716/07/2014
- 8. FACTORS AFFECTING SOIL CEMENT STABILIZATION Type of soil Quantity of cement Quantity of water Mixing, compaction and curing Admixtures Department of Civil Engineering 816/07/2014
- 9. ADVANTAGES It is widely available. Cost is relatively low. It is highly durable. Soil cement is quite weather resistant and strong. Soil cement reduces the swelling characteristics of the soil. Department of Civil Engineering 916/07/2014
- 10. DISADVANTAGES Cracks may form in soil cement. It is harmful for environment. It requires extra labour. Department of Civil Engineering 1016/07/2014
- 11. EXPERIMENTAL PROGRAM Residual soil The characteristics of the residual soil at the UFRGS experimental site have been determined which consisted of a combination of laboratory and field tests. Department of Civil Engineering 1116/07/2014
- 12. Department of Civil Engineering 1216/07/2014
- 13. METHODS OF TESTING MOULDING AND CURING OF SPECIMENS Cylindrical specimens with 50mm in diameter and 100mm in height were used. After the moulding process, the specimen was immediately extracted from the splitmould and its weight, diameter and height measured. The samples were cured in a humid room. Department of Civil Engineering 1316/07/2014
- 14. UNCONFINED COMPRESSION TEST To measure the shearing resistance of cohesive soils. The unconfined compressive strength is defined as the maximum unit stress obtained within the first 20% strain. After curing, specimens were submerged in a water tank for 24h for saturation. Department of Civil Engineering 1416/07/2014
- 15. The water temperature was controlled and maintained at 23°C. The specimens were removed immediately before the test, and the maximum load, which is recorded. Individual strengths of three specimens should not deviate by more than 10% from the mean strength. 16/07/2014Department of Civil Engineering 15 Cont.
- 16. Department of Civil Engineering 1616/07/2014
- 17. STANDARD PROCTOR TEST Standard proctor test is carried out to determine the water content and mass of compacted soil. Then, Bulk mass density, ƥ=M/V Where, M = mass of compacted soil (gm) V = volume of the mould (ml) Dry density, Ɣ = ƥ 𝟏+𝒘 Where, w = water content Department of Civil Engineering 1716/07/2014
- 18. Department of Civil Engineering 1816/07/2014
- 19. Department of Civil Engineering 1916/07/2014
- 20. RESULT AND ANALYSIS Unconfined compressive strength increases with higher percentage of cement content for all water content values. With the increase in porosity, qu reduces for all compacted mixtures. Unconfined compressive strength (qu) as a function of the porosity/cement ratio (η/Civ) defined by the equation, ƞ 𝑪𝒊𝒗 = 𝑽𝒗 𝑽𝒄 Where, η = porosity Civ = cement content , Vv= Volume of voids , Vc= Volume of cement Department of Civil Engineering 2016/07/2014
- 21. Department of Civil Engineering 2116/07/2014
- 22. Department of Civil Engineering 2216/07/2014
- 23. CONCLUSION Cement has been found to be effective in stabilizing a wide variety of soils. The addition of cement and the reduction of porosity promoted an increase in unconfined compressive strength. Water content does not have a major influence in the unconfined compressive strength of cement stabilized soil. The cement-stabilized soil, will maintain significant strength even it becomes saturated. Department of Civil Engineering 2316/07/2014
- 24. REFERENCES Sergio Filipe Veloso Marques, Nilo Cesar Consoli, and Jorge Almeida e Sousa, “Testing Cement Improved Residual Soil Layers”, Journal of Materials in Civil Engineering, Vol. 26, No. 3, pp. 544-550, Mar 2014. Sara Rios, AntónioViana da Fonseca, and Beatrice Anne Baudet, “Effect of the Porosity/Cement Ratio on the Compression of Cemented Soil ”, Journal of Geotechnical and Geo environmental Engineering, Vol. 138, No. 11, pp. 1422-1426, Nov 2012. Dr.K.R.Arora, “Compaction of Soils”, Soil Mechanics and Foundation Engineering (Geotechnical Engineering), pp. 358-361, 2011. Department of Civil Engineering 2416/07/2014
- 25. THANK YOU Department of Civil Engineering 2516/07/2014
- 26. Department of Civil Engineering 2616/07/2014