This standard details the procedure for determining the splitting tensile strength of concrete using cylindrical specimens. It is utilized by QA/QC engineers and testing laboratories to indirectly assess the tensile strength and cracking resistance of concrete mixtures.
Specifies the method for determining the split tensile strength of hardened concrete cylinders or cubes.
Quick Reference Values
standard specimen diameter150 mm
standard specimen length300 mm
rate of loading1.2 to 2.4 N/mm²/min
plywood strip thickness3 mm
plywood strip width12 mm
plywood strip lengthGreater than the length of the specimen
Key Formulas
fct = 2P / (π × d × l) — Splitting tensile strength (where P is max load, d is diameter, l is length)
Practical Notes
Specimens must be tested immediately after removal from water curing while they are still wet; drying out can significantly alter tensile test results.
Plywood packing strips are mandatory between the specimen and the machine platens to prevent local compressive crushing and ensure a true tensile failure.
Proper alignment using a jig is critical to ensure the load is applied exactly along the diametral plane.