Testing on hardened concrete nishmal
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This document summarizes three common concrete tests: compression, split tension, and flexure strength. The compression test uses cylindrical specimens to determine the compressive strength of concrete, which typically ranges from 21 to 34 MPa. The split tension test measures tensile strength by applying a compressive load along the cylinder's diameter until failure, and the flexure strength test uses a three-point loading apparatus on beam specimens to calculate the modulus of rupture. Both the split tension and flexure strength tests help evaluate properties important for concrete pavements and structures.
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Testing on hardened concrete nishmal
- 2. Compression Test ASTM C39: cylindrical specimen (6 in. by 12 in.) For normal-weight concrete: fc’ range is 21 MPa to 34 MPa (3000 psi to 5000 psi) Compressive strength depends on specimen size Larger specimens = greater probability for weaker elements, reducing strength Larger specimens have less variability and better representation of actual concrete
- 4. Split tension test Measures the tensile strength on concrete (ASTM C496) Cylinder is subjected to compressive load along vertical diameter at a constant rate until fatigue Failure occurs along vertical diameter due to tension developed in transverse direction Split tension is computed by T = 2p/BLD T = tensile strength, MPa (psi) p= load at failure, N (psi) L = length of specimen, mm (in.) D = diameter of specimen, mm (in.) Tensile strength varies from 2.5 MPa to 31 MPa (360 psi to 450 psi), about 10% of compressive strength
- 6. Flexure strength test Used for measuring Modulus of Rupture (MR) Important test for road and airport concrete pavements Beam specimen of square x-section is loaded into a 3-point loading apparatus· Calculation of MR If the fracture occurs in the middle 1/3 of the span R = PL/(bd^2) Where: R = flexure strength, MPa (psi) P = maximum load applied, N (lb) L = span length, mm (in.) b = average width of specimen, mm (in.) a = average depth of specimen, mm (in.) If fracture occurs further outside the middle third, the results must be thrown out
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