why the compressive strength of concrete is calculated only after 28 days.why not after 25, 26,27 days..
Answer Posted / joseph
The compressive strength is calculated at 3 ,7 ,28 days.if
you want to transport a precast structure of the grade
40/20 ,it should aquire 60% of design strength ..here it is
60% of 40.In seven days we shoul attain 75% of design
strength. Then your answer ; all the test cubes must attain
their 100% of design strength in 28 days. to ensure this
one we are taking test in 28 days .if cubes fail we have to
go for field test such as smith and hammer test or pulse
velosity (BS 12504 ).
Refer BS 1881 part 116
there are some factors to asses the test result
refer BS 6089
Is This Answer Correct ? | 15 Yes | 5 No |
Post New Answer View All Answers
What is type failure of road surface? how to repair the failure of road surface?
For sloping slabs or sloping beams why the tension steel from either side of ridge is taken into compression zone of other side?
how many cement used in single story residential building per sqft
How to find weight of steel in kg if we know the area which is in m2? Following details are known to us, Area=125m² thk of slab=250mm Steel details:T12@200 PS:considering mesh top and bottom with X and Y direction
States some of the commonly used commands in cad software’s?
why we create short columns under grade slab?
can any one tell me in detail footing estimation .. i am new here in dubai so facing lots of problem...
when it is noted "JAMB SIM" what is the term "SIM" and what does it mean?
how many sqft or cft of work done by a mason per day in all works such as brick,block,concrete,shuttering carpenter,reinforcement fabricator,painter,door window carpenter.....everything thank you
Are you ready to relocate with your immediate family to United States as a new employee?
How to measure the requirement of cement n sand for 12mm and 20mm plastering thanks in advance
i want texture painting pwd data
what is spacing of wallar support of 3m column. the thickness of column is 0.25 m.
I need to constructive work in amaraj batteries
What will be the exam pattern and syllabus for j.e post of haryana staff selection commision? Advt no. (02/2015) Some people says it would only be objective type question papers while others say it would be same as ssc (1 objective,1 conventional) ?? Please answer this question it is needfull to all.