icl determination

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THE DETERMINATION OF THE ICL and ICC OF MATERIAL TO BE STABILISED. 1 SCOPE This method covers the determination of the lime demand of material to be used in lime and cement stabilisation. lt gives an indication whether the soil in question can be stabilised. The test is done by mixing the material passing the 0.425mm sieve with set amounts of lime, creating a train of samples containing 0% lime to say 12%. By means of a pH meter the hydrogen ion concentration (pH) of each prepared sample/water suspension is measured and a graph of pH vs lime content is produced, the ICL/ICC then being determined from the graph. Definition The pH of a suspension expresses the degree of alkalinity or acidity and can be defined as the negative logarithm of the hydrogen ion concentration of the solution i.e. pH= log[H+].The practical pH range of a solution extends from 0 to 14, where the acid range = 0 to 7 alkalinity range= 7 to 14. 2 APPARATUS: 2.1 An electrically-operated, pH-meter with temperature compensation accurate to 0.02 pH units in the range pH=0 to pH=14. 2.2 A combination high alkaline glass/calomel reference electrode. 2.3 pH meter calibration buffer solutions, normally pH = 4 and pH = 9 2.4 A balance to weigh up to 100g, accurate to 0.01g. 2.5 A thermometer ranging from 0 degC to 59 degC. 2.6 A 100 ml measuring cylinder. 2.7 A polythene wash bottle with distilled water.

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ICL

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THE DETERMINATION OF THEICL and ICC OF MATERIAL TO BE STABILISED.1 SCOPEThis method covers the determination of the lime demand of material to be used in limeand cementstabilisation. ltgives anindication whether thesoil inquestion can bestabilised.Thetest isdonebymixingthematerial passingthe0.425mmsievewithsetamounts of lime, creating a train of samples containing 0 lime to say !2. "y means of ap# meter the hydrogen ion concentration $p#% of each prepared sample&water suspensionismeasuredandagraphof p#vslimecontent isproduced, the'()&'((thenbeingdetermined from the graph. DefinitionThe p# of a suspension expresses the degree of al*alinity or acidity and can be defined asthe negative logarithmof the hydrogen ion concentration of the solution i.e. p#+log,#-..The practical p# range of a solution extends from 0 to !4, where theacid range + 0 to /al*alinity range+ / to !4.2 APPARATUS:2.! 0n electrically1operated, p#1meter with temperature compensation accurate to 0.02 p# units in the rangep#+0 to p#+!4.2.2 0 combination high al*aline glass&calomel reference electrode.2.2 p# meter calibration buffer solutions, normallyp# + 4 and p# + 32.4 0 balance to weigh up to !00g, accurate to 0.0!g.2.5 0 thermometer ranging from 0 deg( to 53 deg(.2.4 0 !00 ml measuring cylinder.2./ 0 polythene wash bottle with distilled water. 2.5 6olythene containers approximately 250 ml capacity with air1tiqht lids.3 METHOD:3.1 Pe!aation of Mateia".6repare at least !000 grams of material finer than 0.425mm and oven dry at !!0deg(. 7eighout tenx50gportionsof thepreparedmaterial, accuratelyto0.!g, into250mlpolyethalenecontainers.7eighout thecalculated masses oflime&cement, accuratelyto0.0!g, in the proportions80, 0.5, !.0, !.5, 2.0, 2.0, 4.0, 4.0, 5.0, !0.0andaddthistotheweighedout samplesrespectively.9ha*ethecontainerstomixthelime&cement and material. :easure out !00 ml of carbon dioxide free distilled water andadd it to the mixture in the containers. $(arbon ;ioxide free distilled water can be made byboiling distilled and allowing it to cool to room temperature.9ha*ethesuspensionfor aminimumperiodof 20seconds.