Table of Contents
What will you do if your cube test result failed?
Generally we do Rebound hammer test when the concrete cube fails. But rebound hammer test is only for checking the hardness of the concrete . No absolute assessment can be done with a rebound hammer. Ultrasonic test and if this also fails then go for core cutter and test it to get actual strength of laid concrete.
What is the strength of concrete after 14 days?
Compressive Strength of Concrete at Various Ages
| Age | Strength percent |
|---|---|
| 1 day | 16\% |
| 3 days | 40\% |
| 7 days | 65\% |
| 14 days | 90\% |
What next if concrete cubes failed after 28 days?
Even if one of the cubes is OK wait for a 28 Day result. If 28 days result fails then again there is a possibility that cubes are not filled properly or they were not cured properly in the first 7 days. But it is possible that slab concrete is OK. Go for the Hammer test.
What is the cure time for concrete?
Concrete typically takes 24 to 48 hours to dry enough for you to walk or drive on it. However, concrete drying is a continuous and fluid event, and usually reaches its full effective strength after about 28 days. Here are some of the basic facts regarding the question of concrete drying time.
How do you increase the strength of a cube?
The compressive strength of concrete can be increased by:
- Including admixtures.
- Adjusting the cement type and quantity.
- Reducing the water/cement ratio.
- Utilizing supplementary cementitious materials (SCMs)
- Altering the aggregates – type and gradations.
How much is the curing time period?
Since all desirable properties are improved with curing, the period should be as long as practical. For most concrete structures, the curing period at temperatures above 5º C (40º F) should be a minimum of 7 days or until 70\% of the specified compressive or flexural strength is attained.
What to do if a concrete cube fails in slab test?
The sampling for the cube is also very very important. If the cube fails in test, the part of the SLAB must be tested for other parameter also before taking any final decision. Posted: 3046 days ago Yogi Kumar : 1. Check if result of all 7 days cubes are the same. If even one passes the acceptable criteria you are sure that the concrete mix is OK.
What should I do after a failed cube test?
If hammer test is also as per failed cube result then go for core cutter and test it to get actual strength of laid concrete. 5. Take this core cutter result to consultant and he will take a decision weather he can retain the concrete with rectification like grouting and all.
How to test the strength of slab concrete?
But it is possible that slab concrete is OK. Go for Hammer test. 4. If hammer test is also as per failed cube result then go for core cutter and test it to get actual strength of laid concrete. 5. Take this core cutter result more 1. Check if result of all 7 days cubes are the same.
What should I do if 28 days of concrete cure fails?
If 28 days result fails then again there is a possibility that cubes are not filled properly or they were not cured properly in first 7 days. But it is possible that slab concrete is OK. Go for Hammer test. 4. If hammer test is also as per failed cube result then go for core cutter and test it to get actual strength of laid concrete.