What is the purpose of the ball test in IS 1624?

It provides a quick field indication of the workability and plasticity of the lime putty by observing how a 50mm ball of lime yields under impact.

Can field tests substitute laboratory tests for building lime?

No, field tests are preliminary for quick site acceptance; formal quality verification should be done in a lab as per IS 6932.

How are impurities assessed on-site?

By washing a prepared lime paste through an 850-micron IS sieve and visually examining the retained residue for unburnt materials or inert matter.

IS 1624

: 1986

Method of field testing of building lime

CurrentRareTesting MethodMaterials Science · Building Limes and Gypsum Products

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This standard provides simple, rapid field testing methods to assess the general quality and suitability of building lime on construction sites without the need for a full laboratory setup. It covers visual inspection, impurity checks, workability (ball test), and basic soundness.

Method of field testing of building lime

Quick Reference Values

Sieve size for field impurity test850 micron

Ball size for workability test50 mm diameter

Drying time for soundness pat24 hours minimum

Minimum sample size for visual inspection5 kg

Practical Notes

Field tests are indicative only and should not replace formal laboratory testing (IS 6932) for critical structural or conservation applications.

During visual examination, look for lumps, unburnt limestone pieces, and consistency in color which indicate poor calcination.

Ensure quicklime is thoroughly and safely slaked before attempting any workability or soundness field tests.