Lime Reactivity (LR) of Pozzolana
Scope This method of test covers the procedure for determining the reactivity of the pozzolana with hydrated lime. Why should we perform Lime Reactivity Test Pozzolana is basically a silica rich non-cementing material. Reactive silica while react with lime and water develops a contentious property. Thus LR test allows us to know how much does this pozzolana is reactive with lime or it is usable or not. Reaction of Pozzolana with Lime and Water CaO + SiO2 + 2H2O → Ca(OH)2 + H4SiO4 [i.e. Calcium Hydroxide and Silicic Acid] Ca(OH)2 + H4SiO4 → CaH2SiO4·2 H2O i.e. CH + SH → C-S-H Gel [which is responsible for strength development] Sampling As per IS : 3535 Temperature and Humidity Temperature Relative Humidity Moulding Room 27 ± 2 °C Not less than 65% Dry Material Water Apparatus Cube Moulds - 50 ± 0.1 mm Balance (1000g, Least Count - 1g) Mixing Apparatus Flow Table Tamping Rod Gauging Trowel (IS : 10086) Measuring Cylinder ( 100ml) Procedure Clean appliances should ...