What is stabilazation?

What is stabilization?Soil stabilization is referred to as a procedure in which a special soil is proportioned/added or removed, or a cementing material, or a chemical material is added to a natural soil material to improve one or more of its properties.NecessityReduced-DustingReducedWhip-OffofAggregateBenefits of Stabilization1. The prime objective of soil stabilization is to improve the California Bearing Ratio of in-situ soils by 4 to 6 times2. The other prime objective of soil stabilization is to improve on-site materials to create a strong and solid sub-base and base courses. Objective of Study1.The chemical to be used is prohibited for any application below top of subgrade2.May cause severe respiratory and digestive tract irritation with possible burns3.May cause severe eye and skin irritation 4.May cause cardiac disturbances

Restrictions on use of Calcium Chloride DihydrateSoilsCalcium Chloride Dihydrate

Material used1) To collect a particular soil sample and determine its basic physical property such as LL, PL, PI and grain size distribution 2) To study the soil under modified proctor compaction and determine the MDD and OMC for the soil sample 3) To carry out CBR Test for sample soaked in different times 4) To obtain moisture content for varying degree of soakingScope of WorkSymbol of Modified Soil and its percentageSymbolPercentage of chemicalSCg00SCg12SCg24SCg36SCg48SCg5101.Plastic limit2.Liquid limit3.Standard Proctor Test4.Laboratory CBR test

The laboratory, tests are conducted on soil samples. Similarly the laboratory tests are performed on soil + calcium-chloride mixes. The different tests conducted are as given belowThis test is done to determine the liquid limit of soil. The liquid limit is that moisture content at which a soil changes from the liquid state to the plastic state

Liquid Limit Test Plastic limit is defined as minimum water content at which soil remains in plastic state. The plasticity index is defined as the numerical difference between its Liquid limit and Plastic limitPlastic Limit Teststandard proctor test is carried out which gives the Maximum Dry Density(MDD) and Optimum Moisture Content (OMC),standard proctor test

A photograph while preparing (soil+CaCl2.2H20) sample in mould for standard proctor test

The California bearing ratio test is penetration test meant for the evaluation of subgrade strength of roads and pavements. The results obtained by these tests its component layers. This is the most widely used method for the design of flexible pavementCBR= (PENETRATION LOAD/STANDARD LOAD) X 100

C.B.R. TESTA photograph of front view of California Bearing Ratio Test apparatus assembly

Geotechnical Properties of Soils

Sr. no.PropertySoil1.Specific gravity 2.612.Particle size analysis Gravel content % (20 to 4.75mm) 6.33Sand content % (4.75 to 0.075mm) 19.82Silt and clay content %( below 0.075) 73.853.Atterbergs limit; %Liquid limit 40.14Plastic limit 29.76Plasticity index 10.384.Maximum dry density gms./cc 1.53Optimum moisture content % 24.8%5.California bearing ratio %(soaked) 2.06.California bearing ratio %(unsoaked) 7.01Effect of CALCIUM-CHLORIDE Dihydrate additive on maximum dry density for soilSr.no.propertySample1Sample2Sample3Sample4Sample5Sample61.Proportion soil & cacl302468102.Max dry density (gm/cm3)1.581.691.821.781.881.98Effect of Addition of Calcium-Chloride on M.D.DThe effect of CaCl2 additive on CBR values for unsoaked soilSr. no.propertySample1Sample2Sample3Sample4Sample5Sample61.Proportion soil & cacl202468102.CBR VALUES7.0111.929.126.945.914.13The effect of CaCl2 additive on CBR values for soaked soilSr. no.propertySample1Sample2Sample3Sample4Sample5Sample61.Proportion soil & cacl202468102.CBR VALUES2.05.04.41.81.31.0Effect of Calcium-Chloride Addition on C.B.R for soaked and unsoaked Soil by Experimental AnalysisComparison between experimental and statistical methodSr. no.TitleExperimental valueStatistical value% of CaCl21.In soaked condition02.02.8225.03.9444.44.2861.84.9581.36.84101.07.672.In un-soaked condition07.014.47211.965.9249.127.3266.948.6485.919.89104.1311.08Based on the cost analysis carried out, it is clear that the use of calcium-chloride 2% by mix for improving the weak sub-grade is economical in construction of flexible pavementCONCLUSIONSFuture ScopeApplications