Similar International Standards
ASTM C579-18ASTM International, USA
HighCurrent
Standard Test Methods for Compressive Strength of Chemical-Resistant Mortars, Grouts, Monolithic Surfacings, and Polymer Concretes
Directly corresponds to the compressive strength test method within IS 4456.
ASTM C580-18ASTM International, USA
HighCurrent
Standard Test Method for Flexural Strength and Modulus of Elasticity of Chemical-Resistant Mortars, Grouts, Monolithic Surfacings, and Polymer Concretes
Directly corresponds to the flexural strength (transverse) test method within IS 4456.
ASTM C413-21ASTM International, USA
HighCurrent
Standard Test Method for Absorption of Chemical-Resistant Mortars, Grouts, Monolithic Surfacings, and Polymer Concretes
Covers the same property (water absorption) as specified in IS 4456, albeit with a different specimen geometry.
ASTM C307-21ASTM International, USA
HighCurrent
Standard Test Method for Tensile Strength of Chemical-Resistant Mortar, Grouts, and Monolithic Surfacings
Provides the method for determining tensile strength, a key mechanical property also covered in IS 4456.
Key Differences
≠The Indian standard IS 4456 is a comprehensive document that combines multiple test methods (compressive, flexural, tensile, absorption, etc.) into one standard. In contrast, ASTM standards are disaggregated, with each test method having its own dedicated standard number (e.g., C579 for compressive, C580 for flexural).
≠The standard laboratory curing temperature specified in IS 4456 is 27 ± 2°C, which is typical for tropical climates, whereas the ASTM standards specify 23 ± 2.2°C (73.4 ± 4°F), reflecting North American laboratory conditions.
≠There is a significant difference in the specified loading rate for the compressive strength test. IS 4456 mandates a rate of approximately 1.5 N/mm²/s, while ASTM C579 specifies a rate of 41 ± 3.4 MPa/min (approximately 0.68 N/mm²/s), making the Indian standard's test more than twice as fast.
≠For the water absorption test, IS 4456 specifies a disc-shaped specimen (50 mm diameter x 12 mm thick), while ASTM C413 uses a 1-inch (25.4 mm) cube or pieces from a broken flexural specimen.
Key Similarities
≈Both IS 4456 and the equivalent ASTM standards are intended for testing the physical and mechanical properties of two-component chemical-resistant mortars, including silicate and various resin types (epoxy, furan, polyester, vinyl ester).
≈The fundamental principles and procedures for conducting the key mechanical tests, such as applying a uniaxial load to a cube for compressive strength and three-point loading on a prism for flexural strength, are identical.
≈The specimen geometry for primary strength tests is virtually identical. Both standards use a ~25 mm cube for compressive strength and a ~25 x 25 x 150 mm prism/bar for flexural strength, ensuring comparable stress distribution.
≈Both standards require a standard curing period of 7 days after specimen preparation before conducting most mechanical tests to allow the mortar to achieve a consistent level of initial strength.