This standard outlines the procedure to evaluate building quicklime by measuring the residue left after its slaking process. It covers sample handling, controlled temperature hydration, sieving techniques, and residue quantification to verify quicklime quality. Professionals in construction materials and engineering utilize this to ensure adherence to lime quality standards.
Overview
This standard outlines the procedure to evaluate building quicklime by measuring the residue left after its slaking process. It covers sample handling, controlled temperature hydration, sieving techniques, and residue quantification to verify quicklime quality. Professionals in construction materials and engineering utilize this to ensure adherence to lime quality standards.
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Frequently Asked
The procedure involves sieving the quicklime through a 2.36 mm IS sieve, gently breaking any retained lumps to avoid excess fines, and repeating until the entire sample passes. The sieved lime is then slaked isothermally by immersing in hot water, using four times the quicklime mass (or up to eight times for high-calcium lime). Temperature control during slaking and thorough stirring ensure uniform hydration over the designated period.
A large clean metal container, approximately 45 cm in diameter and 50 cm deep, equipped with a thermometer accurate to ±1°C, is used. Water is heated to within ±2°C of the specified temperature. About 5 kg of crushed quicklime is slowly added over five minutes with continuous stirring. The temperature is maintained within ±2°C for one hour by adding sprayed cold water or applying heat as necessary. Afterward, the mixture stands for 24 hours, stirred twice, with the last stirring no more than one hour before completion.
Post-slaking, the residue is determined using two IS sieves: an 850-micron (0.85 mm) sieve for coarser particles and a 300-micron (0.3 mm) sieve for finer residues. The slaked material is sieved first through the 850-micron, then through the 300-micron sieve. Residues are washed gently without rubbing, dried at 100 ± 10°C to constant weight, and weighed separately for each sieve to assess residue content.
Following 24 hours of slaking, the sample is sieved through 850-micron and then 300-micron IS sieves using a clean calico cloth filter. The residues are washed carefully without rubbing, dried at 100 ± 10°C until constant mass is achieved, and weighed individually. The residue mass is expressed as a percentage of the original quicklime sample mass using the formula: Residue (%) = (Mass of residue on sieve / Mass of quicklime sample) × 100. These values are rounded as per IS 2-1960 and reported accordingly.
The standard mandates the use of clean, distilled water conforming to IS 1070-1960 to ensure reagent purity and avoid contamination. The water quantity should be approximately four times the mass of quicklime, increasing up to eight times for high-calcium limes. Temperature must be controlled within ±2°C during slaking, and any additional water introduced should be sprayed gently to prevent localized cooling.
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