The compressive strength of concrete is the most common performance measure used by the engineer in designing buildings and other structures. The compressive strength is measured by breaking cylin- drical concrete specimens in a compression-testing machine.
Hereof, why We Do slump test for concrete?
Concrete slump test. The slump test measures the consistency of fresh concrete before it sets. It is performed to check the workability of freshly made concrete, and therefore the ease with which concrete flows. It can also be used as an indicator of an improperly mixed batch.
What is the initial setting time of concrete?
The time at which cement paste loses its plasticity is called initial setting time. The initial setting time for different types of cements is as follows: For OPC (Ordinary Portland Cement) 33 Grade as per IS 269:1989 30 minutes.
How can check cement quality?
The colour of cement gives an indication of excess lime or clay and the degree of burning.
- RUBBING. Take a pinch of cement between fingers and rub it.
- HAND INSERTION. Thrust your hand into the cement bag and it should give cool feeling.
- FLOAT TEST.
- SMELL TEST.
- PRESENCE OF LUMPS.
- SHAPE TEST.
- STRENGTH TEST.