The 1992 edition of IS 1542 outlines the criteria for sands utilized in plastering, including natural, crushed stone, and crushed gravel sands. It details the grading, quality standards, and impurity restrictions to guarantee strong, durable, and visually acceptable plastering on interior and exterior surfaces. This code is vital for construction engineers, architects, and professionals involved in mortar and plaster preparation.
Overview
The 1992 edition of IS 1542 outlines the criteria for sands utilized in plastering, including natural, crushed stone, and crushed gravel sands. It details the grading, quality standards, and impurity restrictions to guarantee strong, durable, and visually acceptable plastering on interior and exterior surfaces. This code is vital for construction engineers, architects, and professionals involved in mortar and plaster preparation.
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Frequently Asked
IS 1542:1992 covers various sands suitable for plastering mortars, including naturally sourced sand, crushed stone sand, and crushed gravel sand. These sands are appropriate for internal wall and ceiling plastering as well as external plastering using lime, cement, lime-cement, ALMP, or gypsum-based mixes. The standard specifies grading criteria based on IS sieve analysis to ensure suitability.
According to IS 1542, the maximum content of clay, silt, and fine dust in plaster sand should not exceed 5% by weight, determined following IS 2386 Part 2:1963. Organic impurities should be minimal and must not negatively impact the plaster's strength, durability, appearance, or cause corrosion. Sand must also be free from other harmful materials such as iron pyrites, salts, coal, mica, shale, soft fragments, and seashells.
IS 1542 prescribes particle size distribution requirements for plaster sand detailed in Clause 5.1 and Table 1. Sand grading is evaluated using sieve analysis as per IS 2386 (Part 1):1973. The standard specifies percentage passing ranges across IS sieve sizes from 10 mm down to 150 microns, allowing minor deviations up to 5% except for specific fine sieves. Uniform particle distribution is emphasized to ensure proper mortar workability and finish.
Mortar prepared with one part cement and six parts sand by volume, using sand that complies with IS 1542 grading, must attain an average compressive strength of at least 3 N/mm² at 28 days. Testing follows the procedure outlined in Appendix A of IS 2250:1981. This strength criterion ensures the mortar's durability and bonding capability for plaster applications.
Per IS 1542 Clause 7, suppliers must furnish, upon purchaser’s request, details including the exact source location of the sand (quarry or pit), the principal rock type trade group for manufactured sands (per IS 383 Appendix C), and the particle size distribution in accordance with IS 2386 Part 1:1963. Additionally, and subject to agreement, suppliers should provide specific gravity and bulk density data per IS 2386 Part 3:1963, along with bulking versus moisture content information, preferably presented as a graph.
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