The 1984 edition of IS 10790 Part 2 outlines standardized procedures for sampling reinforcing steel used in reinforced concrete. It details sample selection, sizes, and acceptance criteria, offering guidance to manufacturers and buyers for process control and lot inspections to maintain consistent quality in the physical, chemical, visual, dimensional, and weight properties of reinforcing steel. This code is vital for ensuring stringent quality assurance in steel production and procurement for reinforced concrete applications.
Overview
The 1984 edition of IS 10790 Part 2 outlines standardized procedures for sampling reinforcing steel used in reinforced concrete. It details sample selection, sizes, and acceptance criteria, offering guidance to manufacturers and buyers for process control and lot inspections to maintain consistent quality in the physical, chemical, visual, dimensional, and weight properties of reinforcing steel. This code is vital for ensuring stringent quality assurance in steel production and procurement for reinforced concrete applications.
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Frequently Asked
Per IS 10790 Part 2, the recommended sample sizes for testing reinforcing steel vary depending on lot size as follows: for lots up to 50 items, select 2 samples; for 51 to 150 items, 3 samples; for 151 to 500 items, 5 samples; and for lots exceeding 500 items, 8 samples. Lots are defined by uniform grade and size produced under consistent conditions. Samples must meet visual, dimensional, and weight criteria before undergoing tests such as proof stress, elongation, tensile strength, and bending as specified.
IS 10790 Part 2 specifies lot conformity through mechanical and physical criteria. For tensile strength, proof stress, and elongation, if there are two samples, both must individually meet the criteria. For three or more samples, the lot conforms if the mean minus 0.4 times the range of the results is greater than or equal to the minimum specified limit. Visual, dimensional, and weight inspections require that the number of defectives not exceed the acceptance number from the sampling tables. Sampling and inspections are conducted per relevant clauses, ensuring balanced statistical and practical acceptance.
IS 10790 Part 2 requires several physical tests for reinforcing steel, including tensile strength, proof stress, elongation, and bend and rebend tests to verify mechanical properties. Chemical testing involves analyzing the composition for elements such as carbon, manganese, sulfur, and phosphorus, ensuring compliance with relevant IS limits. Sampling must accurately represent the batch, and specimens are prepared according to IS standards to guarantee consistent and reliable results.
Manufacturers should apply process control and conduct routine inspections to maintain consistent quality and adherence to specifications. Sampling is done regularly based on daily production tonnage, with sample sizes and test frequencies increasing with production volume. Unsatisfactory results require immediate process correction and segregation of non-compliant products. Test certificates reflecting conformity are issued based on process inspection data, ensuring systematic quality assurance throughout manufacturing.
IS 10790 Part 2 recommends using a variables approach for quantitative data such as tensile strength, elongation, dimensions, weight, and chemical composition, and an attributes approach for qualitative assessments like bending tests and visual inspections. Test results should be recorded and statistically evaluated, with records retained for two to three years. Reference IS codes guide the use of normal and F-tests, chi-square tests, regression, correlation, and ANOVA for comprehensive analysis. These methods enable rigorous quality control and informed process adjustments.
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