IS 6441:1972 Part 2 is the Indian Standard (BIS) for methods of test for cellular concrete - part 2: compressive strength. This standard (Part 4 of a series) outlines the laboratory method for determining the drying shrinkage of cellular concrete, including both autoclaved and non-autoclaved types. It covers the specifications for test specimens, apparatus, procedure for controlled drying, and the formula for calculating the percentage of shrinkage.
Specifies the method for determination of compressive strength of cellular concrete.
Overview
- Status
- Current
- Usage level
- Specialized
- Domain
- Materials Science — Precast and Prefabricated Concrete
- Type
- Testing Method
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Practical Notes
! Maintaining the stringent drying conditions (50 ± 1 °C and 17 ± 2% RH) is the most critical factor for achieving accurate and reproducible results.
! Ensure gauge studs are firmly fixed and free of debris before each measurement to avoid errors in length reading.
! The test is a long-duration test, as specimens must be dried to a constant mass, which can take several days or weeks.
Frequently referenced clauses
cellular concreteaerated concretelightweight concretefoam concrete
International Equivalents
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Key Values6
Quick Reference Values
Standard specimen size250 x 50 x 50 mm
Number of specimens per sample3
Curing temperature27 ± 2 °C
Drying temperature50 ± 1 °C
Drying relative humidity17 ± 2 percent
Condition for constant mass< 0.2% mass change in 24 hours
Key Formulas
Drying Shrinkage (%) = [(L1 - L2) / L1] x 100 — Where L1 is initial length and L2 is final length at constant mass.
Tables & Referenced Sections
Key Clauses
Clause 2 - Test Specimen
Clause 3 - Procedure
Clause 4 - Calculation
Clause 3.3 - Drying of the Specimen
Frequently Asked Questions4
What is the standard size of the test specimen for drying shrinkage?+
A prism of 250 x 50 x 50 mm is specified (Clause 2.1).
What are the drying conditions for the test?+
Specimens are dried in an oven at a temperature of 50 ± 1 °C and a relative humidity of 17 ± 2 percent (Clause 3.3).
When is the test considered complete?+
When the specimen reaches constant mass, defined as a mass change of less than 0.2% between two weighings taken 24 hours apart (Clause 3.4).
How many specimens are required for one test?+
A set of three specimens shall be made from the same sample of concrete (Clause 2.1).
QA/QC Inspection Templates
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QA/QC templates coming soon for this code.