Objective

For determination of dry material content of liquid admixtures. 

Reference Standards

IS : 9103-1999- Concrete admixtures specification

Equipment & Apparatus

• Oven(300⁰c)
• Bottle
• Balance(0-10kg)

Procedure

1. 25 to 30 g of preheated, completely dry sand is placed in a wide mouth glass weighing bottle provided with ground glass stopper.
2. The bottle with sand and stopper is placed in the electric oven and dried for 17±1/4 h at 105±2⁰ C.
3. The bottle with stopper is allowed to cool to room temperature and its weigh is recorded to nearest 0.001 g.
4. The stopper is then removed and 4 ml of liquid is evenly distributed over the sand with the help of a pipette.
5. The stopper is then inserted and the bottle and stopper is placed in the oven for 17±1/4 h at 105±2⁰ C
6. After drying it is cooled to room temperature and its weight is recorded to the nearest 0.001 g.

Calculation

Weight of bottle and sand = W₁

Weight of bottle, sand and sample = W₂

Weight of sample = W₂-W₁

Weight of bottle, sand and dried residue = W₃-W₁

 

Report

The result is reported to nearest whole number. 

Safety & Precautions

• Use hand gloves while removing containers from oven after switching off the oven.
• Equipment should be cleaned thoroughly before testing & after testing.
• To check electric supply of the instrument.
• To wear safety shoes & aprons at the time of test.