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1) What is the compressive strength of concrete
2) What is the tensile strength of steel
3) Why cracks are happening in walls

Answer Posted / piyush singh

1) compressive strength of concrete cube of size 150*150*150
for M20 is > 20n/mm^2 (should be above 20 and in no case <)
M30 is > 30n/mm^2

2) tensile strength of mild steel is 250 n/mm^2 (limit state)
and in working stress 150 n / mm^2

HYSD bars strength is 415 , 500 n/mm^2

HTS bars is 1200 n/mm^2 and for others hts tensile
strentgh is stress corresponding to 0.2 % of strain known
as proof stress

3) cracks in wall occurs due to various action of weather
freezing thawing
sulphate attack
lower grade of bricks
plaster not well cured

Is This Answer Correct ?    4 Yes 2 No



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