Testing on hardened concrete nishmal

Testing on hardened concrete nishmal

• 1.
  By Mohammed Nishmal K 2ab15cv024
• 2.
  Compression Test  ASTMC39: 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
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  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
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  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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  Thank You