The standard outlines the procedure to determine hydraulic cement fineness through dry sieving using a 90 micrometer IS sieve. This test identifies the percentage of coarse particles in cement, which is crucial for evaluating its quality and performance. It is primarily utilized by cement producers, quality assurance labs, and construction engineers to verify compliance with physical standards.
Overview
The standard outlines the procedure to determine hydraulic cement fineness through dry sieving using a 90 micrometer IS sieve. This test identifies the percentage of coarse particles in cement, which is crucial for evaluating its quality and performance. It is primarily utilized by cement producers, quality assurance labs, and construction engineers to verify compliance with physical standards.
Audience
Contents
Structure
Frequently Asked
The procedure entails measuring the mass of cement particles retained on a 90 micrometer IS standard sieve to assess fineness. A representative cement sample, typically 100 grams, is placed on the sieve and shaken either manually or mechanically for about 15 minutes. The residue collected is weighed, and the percentage of retained material relative to the original sample is calculated. A lower residue percentage indicates finer cement, with limits specified in relevant cement standards.
The test sieve consists of a cylindrical frame with a diameter between 150 and 200 millimeters and a depth ranging from 40 to 100 millimeters, fabricated from sturdy, corrosion-resistant metal. The mesh is a woven stainless steel cloth with a 90 micrometer aperture, complying with IS 460 (Part 1 and Part 3) standards for wire cloth and aperture uniformity. The sieve is equipped with a lid on top and a tray beneath to prevent loss of material during sieving. The mesh is visually inspected to ensure absence of irregularities.
Sieve calibration involves using a standard reference material with a known percentage of particles retained on the 90 micrometer mesh. This material is stored in airtight containers to avoid contamination. To verify the sieve, the reference material is shaken for two minutes in a stoppered jar to break clumps, allowed to settle for two minutes, stirred gently to distribute fines, then sieved. The residue obtained is compared against the known value. If within tolerance limits, the sieve is considered accurate; otherwise, it must be replaced or recalibrated. Regular checks are recommended after every 100 uses.
Sampling must be done according to IS 3535:1986 to ensure representativeness. The collected cement sample is thoroughly mixed to guarantee uniformity. Before sieving, the sample is agitated by shaking in a stoppered jar for two minutes to break up agglomerates, then allowed to rest for two minutes. Finally, the powder is stirred gently with a clean, dry rod to evenly disperse fine particles prior to the fineness test. Test sieves conforming to IS 460 (Parts 1 and 3) are used, and result rounding follows IS 2:1960.
Fineness is calculated by dividing the mass of cement residue retained on the 90 micrometer sieve by the total mass of the cement sample, multiplied by 100 to express as a percentage. The residue percentage is reported to the nearest 0.1%. Prior to testing, sieve accuracy is verified using a reference sample with known coarser particle content. The calculated fineness reflects the proportion of coarser particles in the cement, which affects its hydration and strength characteristics.
Ask AI about any clause, requirement, or provision in IS 4031 PART 1. Get instant, clause-cited responses powered by our indexed library.
Free tier includes 150 queries (50 AI + 100 Reference) · No credit card required