What is the minimum quantity of a composite sample for lab testing?

The composite sample should be at least 5 kg to adequately perform all required physical and chemical tests.

What is the procedure for sampling bagged cement?

A slotted sampling tube is inserted through the valve or bag body to collect a full-depth core from a randomly selected number of bags based on lot size.

How should cement samples be transported to the lab?

In moisture-proof, air-tight containers clearly marked with the sample identification, source, and date of sampling.

IS 3530

: 1989

Methods of Sampling Hydraulic Cement

CurrentSpecializedTesting MethodMaterials Science · Cement

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This standard lays down the procedures for sampling hydraulic cement from various sources, including bulk storage, continuous transport systems, and packaged bags. It defines the methodology to obtain representative grab and composite samples to ensure accurate physical and chemical evaluation.

Describes the procedures for drawing representative samples of hydraulic cement from various sources for testing.

Quick Reference Values

minimum composite sample weight5 kg

typical grab sample weightapprox 1 kg

Practical Notes

Always store collected cement samples in clean, completely dry, and air-tight containers immediately after sampling to prevent aeration and pre-hydration.

When sampling from bags, use a slotted sampling tube inserted diagonally to get an accurate cross-sectional representation.

Composite samples must be thoroughly and evenly mixed before being split or quartered for laboratory testing.