CONCRETE TECHNOLOGY PRACTICAL

​TOPIC: SIEVE TEST ON AGGREGATES

​OBJECTIVES ;

The particle size Distribution of samples of aggregates and fillers are determined by sieving.

​MAIN PRINCIPLES

For coarse and fine aggregates free from particles which cause agglomeration , Dry sieve may performed.

​For aggregates which may contain clay or other materials likely to cause agglomeration, preliminary separation by washing through a fine sieve is required before dry sieving i.e. washing and sieving .

​REFERENCES

BS 812: PART 103.1 : 1985.

​REQUIRED EQUIPMENT.

- Test sieves with diameter 450 mm or 300 mm: 75mm , 63, 50 mm, 37.5 mm ,28 mm, 20 mm, 14 mm, 10 mm, 6.3 mm, 5 mm, Test sieves with with diameter 300 mm or 200 mm: 3.35 mm , 2.36 mm, 1.70 mm , 1.18 mm, 825 um, 600 um, 425 um, 300 um, 212 um , 150 um, 75 um.

-lids and receivers.

-A balance readable and accurate to 0.5 g.

-Riffle boxes.

-A drying oven capable of maintaining a temparature 105 c + -5 c

-Metals containers

-Scoop.

Sieve brushes .

Mechanical sieve shaker (Optional).

Sample Preparation.