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Q: In a ordinary Portland cement of 'grade 43'–>'43' refers to .............. of concrete cube of standard dimensions in N/mm2 at 28 days.
  • A. Tensile strength
  • B. Compressive strength
  • C. Characteristic tensile strength
  • D. Characteristic compressive strength
Correct Answer: Option D - Ordinary Portland Cement is graded according to strength, the other cements too have to gain a particular strength. 33, 43 and 53 grade in OPC indicates the characteristic compressive strength of cement after 28 days when tested as per IS: 4031:¬1988, eg, 33 Grade means that 28 days of compressive strength is not less than 33 N/mm2 (MPa). Similarly, for 43 grade and 53 grade the 28 days compressive strength should not be less than 43 and 53 MPa respectively.
D. Ordinary Portland Cement is graded according to strength, the other cements too have to gain a particular strength. 33, 43 and 53 grade in OPC indicates the characteristic compressive strength of cement after 28 days when tested as per IS: 4031:¬1988, eg, 33 Grade means that 28 days of compressive strength is not less than 33 N/mm2 (MPa). Similarly, for 43 grade and 53 grade the 28 days compressive strength should not be less than 43 and 53 MPa respectively.

Explanations:

Ordinary Portland Cement is graded according to strength, the other cements too have to gain a particular strength. 33, 43 and 53 grade in OPC indicates the characteristic compressive strength of cement after 28 days when tested as per IS: 4031:¬1988, eg, 33 Grade means that 28 days of compressive strength is not less than 33 N/mm2 (MPa). Similarly, for 43 grade and 53 grade the 28 days compressive strength should not be less than 43 and 53 MPa respectively.