Civil Engineering - Concrete Technology - Discussion

Absolute answer is semi-plastic (slump value 100 to 175) vibration is not possible. But in the case of the Dry mix (slump value 25 to 50) mechanical and hand vibrator can be used.

In case of Moist earth (slump value 0 to 25) power vibrator can be used.

In case of Plastic (slump value 50 to 100) most commonly used in major engineering structures like piers etc, where reinforcement requirement is more, so obviously here also used vibrator. But only in case of semi plastic, though it's workability is very high but can't we use vibrator, since it is like water.

Option D is correct because compaction by vibrator is used when the slump is not greater than 50mm and for plastic slump value is 65mm, so D option is correct.

If concrete is plastic, then its workability will be high. In such causes vibrator is not a suitable technique for compaction.

D is the right answer because concrete is plastic and if we compact it by vibration then segregation of concrete results.

No, it is wrong, when vibrator used slump value should not be greater than 5cm and plastic concrete has slump value 6.5.

As plastic concrete is self-consolidated concrete.

So no compaction is required.

The right answer is semi Fluid for which the slump value is 100- 175mm.

I think the dry concrete is not suitable.

Could you please explain it?

I think plastic is correct.