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As per Indian Standard specifications concrete is designated into
- a)3 grades
- b)5 grades
- c)7 grades
- d)10 grades
Correct answer is option 'C'. Can you explain this answer?
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Verified Answer
As per Indian Standard specifications concrete is designated intoa)3 g...
You are correct! According to Indian Standard specifications, concrete is designated into seven grades, which are designated as M10, M15, M20, M25, M30, M35, and M40. These grades are based on the strength of the concrete, with M10 being the weakest and M40 being the strongest.
The letter "M" stands for "mix" and the number following it represents the characteristic compressive strength of the concrete in N/mm^2 (Newtons per millimeter squared) at 28 days when tested with the 15cm diameter and 30cm height cylinder. For example, M20 concrete has a characteristic compressive strength of 20 N/mm^2 at 28 days.
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As per Indian Standard specifications concrete is designated intoa)3 g...
Indian Standard specifications for concrete grades
Indian Standard specifications for concrete are designated based on the compressive strength of concrete measured in Mega Pascals (MPa). The different grades of concrete are:
a) 3 grades: This option is incorrect as Indian Standard specifications for concrete have more than 3 grades.
b) 5 grades: This option is incorrect as Indian Standard specifications for concrete have more than 5 grades.
c) 7 grades: This option is correct as Indian Standard specifications for concrete are designated into 7 grades. The grades are:
- M15: This grade of concrete has a compressive strength of 15 MPa after 28 days of curing.
- M20: This grade of concrete has a compressive strength of 20 MPa after 28 days of curing.
- M25: This grade of concrete has a compressive strength of 25 MPa after 28 days of curing.
- M30: This grade of concrete has a compressive strength of 30 MPa after 28 days of curing.
- M35: This grade of concrete has a compressive strength of 35 MPa after 28 days of curing.
- M40: This grade of concrete has a compressive strength of 40 MPa after 28 days of curing.
- M45: This grade of concrete has a compressive strength of 45 MPa after 28 days of curing.
d) 10 grades: This option is incorrect as Indian Standard specifications for concrete have 7 grades, not 10.
Conclusion
Indian Standard specifications for concrete have 7 grades, designated based on the compressive strength of concrete measured in MPa. The different grades are M15, M20, M25, M30, M35, M40, and M45.
Indian Standard specifications for concrete are designated based on the compressive strength of concrete measured in Mega Pascals (MPa). The different grades of concrete are:
a) 3 grades: This option is incorrect as Indian Standard specifications for concrete have more than 3 grades.
b) 5 grades: This option is incorrect as Indian Standard specifications for concrete have more than 5 grades.
c) 7 grades: This option is correct as Indian Standard specifications for concrete are designated into 7 grades. The grades are:
- M15: This grade of concrete has a compressive strength of 15 MPa after 28 days of curing.
- M20: This grade of concrete has a compressive strength of 20 MPa after 28 days of curing.
- M25: This grade of concrete has a compressive strength of 25 MPa after 28 days of curing.
- M30: This grade of concrete has a compressive strength of 30 MPa after 28 days of curing.
- M35: This grade of concrete has a compressive strength of 35 MPa after 28 days of curing.
- M40: This grade of concrete has a compressive strength of 40 MPa after 28 days of curing.
- M45: This grade of concrete has a compressive strength of 45 MPa after 28 days of curing.
d) 10 grades: This option is incorrect as Indian Standard specifications for concrete have 7 grades, not 10.
Conclusion
Indian Standard specifications for concrete have 7 grades, designated based on the compressive strength of concrete measured in MPa. The different grades are M15, M20, M25, M30, M35, M40, and M45.
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As per Indian Standard specifications concrete is designated intoa)3 gradesb)5 gradesc)7 gradesd)10 gradesCorrect answer is option 'C'. Can you explain this answer?
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