The 1979 edition of IS 9162 outlines standardized testing procedures for epoxy resins, hardeners, and their composite formulations used in floor topping applications. It details evaluation methods for physical, mechanical, thermal, and chemical characteristics including strength, abrasion resistance, thermal behavior, shrinkage, and water uptake. This code is vital for manufacturers, quality assurance professionals, and researchers ensuring the reliability and durability of epoxy-based flooring materials.
Overview
The 1979 edition of IS 9162 outlines standardized testing procedures for epoxy resins, hardeners, and their composite formulations used in floor topping applications. It details evaluation methods for physical, mechanical, thermal, and chemical characteristics including strength, abrasion resistance, thermal behavior, shrinkage, and water uptake. This code is vital for manufacturers, quality assurance professionals, and researchers ensuring the reliability and durability of epoxy-based flooring materials.
Audience
Contents
Structure
IS 9162 defines testing protocols for epoxy resins, hardeners, and their mixtures, including parameters such as amine number, epoxy content, viscosity, specific gravity, working time, various strength measures (compressive, flexural, tensile, bond), linear shrinkage, thermal expansion, water absorption, chemical and abrasion resistance, thermal conductivity, shear strength, and hydrolyzable chlorine content. Key formulas for strength calculations and shrinkage are provided, alongside standardized symbols for stress, strain, temperature, and load.
The standard mandates the use of reagent-grade chemicals with specified purity for testing accuracy. Common chemicals include analytical reagent-grade hydrochloric acid, sulfuric acid, sodium hydroxide, ammonium hydroxide, ethyl alcohol, and laboratory-distilled water. Proper preparation, handling, and storage of these reagents are emphasized to maintain test integrity.
IS 9162 enumerates the equipment essential for testing, such as precision balances, sieves, moulds, tamping tools, water baths, Vicat and Le Chatelier apparatuses, compression machines, and chemical analysis tools. Additional apparatus specified for particular tests include curing tanks, drying ovens, and mixers, all conforming to defined accuracy and calibration standards.
The code requires specimens representative of the material with dimensions adhering to prescribed standards. Conditioning involves maintaining specimens under controlled temperature (27 ± 2°C) and relative humidity (65 ± 5%) for a minimum duration (usually 24 hours), ensuring uniform moisture content and temperature before testing.
Test outcomes must not deviate from the mean by more than ±0.005 to ensure reliability. Permissible variations in weights used for testing are explicitly tabulated, with stricter tolerances applied for new weights. Standard calculation methods are recommended to maintain precision.
Mixing proportions, specified by manufacturers, should be converted to mass-based ratios for accuracy. Preparation involves adding liquids first into a non-corrosive container, followed by staged addition and thorough mixing of dry materials using a trowel. Mixing time must be recorded to maintain uniformity and reproducibility.
Compressive strength is calculated by dividing the maximum load at failure by the specimen’s cross-sectional area. Tests apply loads at defined rates for cylinders and cubes, with rejection criteria for specimens deviating more than 15% from the average. Self-adjusting platens ensure uniform load distribution.
Specimens are moulded using metal forms coated with silicone grease to prevent adhesion without affecting dimensions. Standard bar specimens have cross sections of 25 mm × 25 mm and a length of at least 250 mm. Careful filling avoids air entrapment, ensuring consistent mechanical properties.
Defective specimens are excluded, and tensile strength is calculated as maximum load divided by cross-sectional area. Values differing by more than 15% from the average are discarded, with tests repeated if fewer than four valid results remain. Yield strength is computed from the maximum load on the stress-strain curve if specimens do not fracture.
The coefficient of linear thermal expansion is calculated from length measurements at different temperatures, accounting for stud expansion and temperature change. Shrinkage is measured daily over two weeks at 22°C and after heating cycles, ensuring stabilization before recording.
Water absorption percentage is calculated from the difference between saturated and conditioned specimen mass, relative to conditioned mass. Reports include manufacturer details, conditioning parameters, specimen age, shrinkage, thermal expansion, mass change, compressive strength variations, specimen appearance, and immersion medium condition.
Specimens are aged for seven days at controlled temperature before immersion in test solutions for durability assessment. Data recorded includes average mass change, visual condition of specimens and immersion media, and compressive strength variations. Results are graphically represented to track changes over time.
Beyond basic testing apparatus, supplementary equipment such as temperature and humidity control devices, specialized molds, and calibration standards are required. Accessories must ensure compatibility, ease of use, durability, and precision.
Two apparatus types are described: low-temperature metal plate units and high-temperature refractory plate units. Specifications cover heater arrangements, surface flatness, thermal expansion limits, surface emissivity, power exchange limits, and cooling methods. Thermal conductivity is calculated from steady-state heat flow, specimen thickness, area, and temperature difference.
Shear strength is determined by testing six aged composite samples using a universal testing machine at a loading rate of 14 N/mm² per minute. Shear strength is calculated by dividing failure load by shear area, with results averaged and plotted alongside compressive strength data to analyze behavior under thermal and mechanical stresses.
Frequently Asked
IS 9162 prescribes preparation of epoxy resin test specimens as follows: For cement concrete epoxy mortar composites, prepare at least six blocks using old concrete blocks sized 15×15×7.5 cm or 10×10×7.5 cm, apply a 2.5 cm thick epoxy topping with a tack coat, and compact using vertical ramming before finishing with a trowel. For pure epoxy cube specimens, prepare at least six 50 mm cubes, coat moulds with silicon grease, fill with approximately 30 grams of epoxy mix, compact with vertical spatula strokes to avoid air pockets, and strike off excess evenly.
Tensile strength is assessed by preparing standardized epoxy resin floor topping specimens and applying axial tensile load until failure using a universal testing machine. The tensile strength is computed by dividing the maximum failure load by the specimen's cross-sectional area, ensuring consistent evaluation of mechanical performance.
The standard recommends the Guarded Hot Plate method for thermal conductivity measurement of dry epoxy resin specimens. Rigid specimens must have flat, parallel surfaces within a 0.25 mm/m tolerance. Temperature drops across specimens are measured using thermocouples embedded flush or nearby, with specimen thickness measured precisely before and after testing. Proper load application ensures consistent thermal contact.
Specimens are conditioned typically at 27 ± 2°C for durations ranging from seven to fourteen days depending on test requirements. This ensures stabilization of moisture content and material properties before testing. Controlled ageing under these conditions facilitates consistent and reliable evaluation of epoxy resin compositions.
Abrasion resistance testing requires a machine conforming to Appendix A, using a 20 g abrasive powder per Appendix B. The grinding disc rotates at 30 revolutions per minute with a 300 N load applied centrally. Abrasive powder is refreshed every 22 revolutions, and specimens are rotated 90° after 110 revolutions to continue up to 220 revolutions. Thickness changes are measured with a dial gauge accurate to 0.01 mm, and specimens are weighed to 0.1 g precision before and after testing, maintaining dry conditions throughout.
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