Interested to Buy Any Domain ? << Click Here >> for more details...
why the compressive strength of concrete is calculated only after 28 days.why not after 25, 26,27 days..
- 7 Answers
- 21297 Views
- I also Faced
- E-Mail Answers
Answers were Sorted based on User's Feedback
Answer / 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 |
Answer / sagar sontakke
As soon as we add water to the dry content of the concrete, process of heat of hydration starts and this process will require a very long time to complete.Almost 90% to 95% of this process is completed within 28 days and remaining takes a year or two.This means that concrete attains 90% of the strength at 28 days. So to judge whether concrete has attained the desired strength, we have to test the concrete at 28 days.
| Is This Answer Correct ? | 12 Yes | 2 No |
Answer / imran
Answer # 4 is the correct answer of this question.
| Is This Answer Correct ? | 1 Yes | 0 No |
Answer / kanchan
Its is because the maximum strength i.e. 99% of strength gained by a cube in 28 days
| Is This Answer Correct ? | 0 Yes | 0 No |
Answer / utsav patel
strength is depend on hydration process. after 28 days aronnd 68% strength is gained by concrete. hydration process is not confined up to certain period is longlasting process .
| Is This Answer Correct ? | 0 Yes | 5 No |
Answer / suresh.s
the cement strength also prepared for 28 days
| Is This Answer Correct ? | 2 Yes | 10 No |
Answer / silpa
Cube Size=150 mmX 150 MM
Area = 22.5 Sqm.
Stress = Load / Area E
Eg : 600/22.5=26.26 N/mm
| Is This Answer Correct ? | 2 Yes | 10 No |
hai,i completed my b.tech civil.Recently i wrote the appsc exam for managers water supply engg.I want answers for general studies and civil engg paper2.If any body know or written that exam send to my mail id is ruksana.sk08@gmail.com.
What is the graphical relationship between N - Value of soil and Dia. of pile when pile length is fixed, and n - Value and length of pile when its dia. is fixed.
What is Lap Length??????
what is the constant weight of the 6mm,8mm,10mm,12mm,20mm,25mm etc.............dia bars in 1meter
3. What are the disadvantages of your present job, things you do not like about it?
What is the difference between Normal Concrete and High density concrete?
What is Aggrgate sizes used in a WMM Plant?
18. What is the thing that might make you happy at your work place?
the water is flowing through a velocity of 1.5m/s in a pipe of length 2500m and dia 500mm. at the end of pipe a valve is provided. find rise in pressure 1. if the valve is closed in 5 seconds. 2. if the valve is closed instantaneously. take value of c = 1460m/s, pipe to be rigid and bulk modulus of water - 19.692x10' n/sqcm
what do you know that m20,m25
Explain the various methods of concrete curing?
what is the status of Brick & cube testing
-
Civil Engineering (5086) - Mechanical Engineering (4453)
- Electrical Engineering (16638)
- Electronics Communications (3918)
- Chemical Engineering (1095)
- Aeronautical Engineering (239)
- Bio Engineering (96)
- Metallurgy (361)
- Industrial Engineering (259)
- Instrumentation (3014)
- Automobile Engineering (332)
- Mechatronics Engineering (97)
- Marine Engineering (124)
- Power Plant Engineering (172)
- Textile Engineering (575)
- Production Engineering (25)
- Satellite Systems Engineering (106)
- Engineering AllOther (1379)
