The aggregate is called fine aggregate if it is completely retained on
The aggregate is called fine aggregate if it is completely retained on Correct Answer None of these
Aggregates used in the construction industry is classified into two categories:
a) Coarse Aggregate: Aggregate retained on 4.75 mm sieve is termed an as coarse aggregate
b) Fine Aggregate: Aggregates passing through 4.75 mm sieve and retaining on 75 μ sieve is termed as fine aggregate.
Important Points
Particle Size classification:
This classification of soils is done on the basis of particle size composition. According to which soil may be termed as clay, silt, sand, gravel, cobbles and boulders.
I.S. Classification (Grain size distribution):
(i) Clay = d < 2μ
(ii) Silt = 2μ < d < 75μ
- Fine silt = 2μ < d < 10μ
- Medium silt = 10μ < d < 20μ
- Coarse silt = 20μ < d < 75μ
(iii) Sand = 75μ < d < 4.75 mm
- Fine sand = 0.075 mm < d < 0.425 mm
- Medium sand = 0.425 mm < d < 2 mm
- Coarse sand = 2 mm < d < 4.75 mm
(iv) Gravel = 4.75 mm < d < 80 mm
- Fine gravel = 4.75 mm < d < 20 mm
- Coarse gravel = 20 mm < d < 80 mm
(v) Cobbles = 80 mm < d < 300 mm
(vi) Boulders = d > 300 mm
