Fasi Ur Rahman - Questions

Test for setting time-based on ASTM C403M – 16

Apparatus:

1. Container
2. penetration needles:
3. Temping road: 16 mm in diameter and 600 mm length
4. Pipet: withdrawal of bleed water from the surface.
5. Thermometer
6. Stopwatch

Preparation of sample:

1. Prepared a 3 specimen
2. Sieve cement from 4.75 mm IS sieve.
3. Make a cement paste by adding water.
4. Make that cement paste non-absorptive
5. Measure the temperature of the Mortar.
6. Place that mortar in the container.
7. Remove all the voids and by tamping via tamping rod.
8. Level the surface.

Procedure:

1. Remove bleed water from the surface by pipet.
2. By measuring the degree of Mortar, then select a suitable size needle.
3. take the point of the needle into contact with the mortar paste.
4. Allow a needle to penetrate freely into the mortar paste up to a depth of 25 mm.
5. Record the time elapsed between the initial contact of cement and water and the penetration of the needle into the mortar paste. Indicates the setting of cement.
6. Calculate penetration resistance= Recorded Force / Bearing area of the needle.

The time between the contact of water to cement and makes the cement sets is called a setting time of cement.