Aggregate-
Defination- The Material used for manufacture of mortar and concrete such as a sand gravel etc are called as aggregate.
Aggregate having mainly two types and this are used in concrete
- Fine Aggregate
- Coarse Aggregate
Fine Aggregate- The aggregate having size is less than 4.75mm is called as fine Aggregates.
Coarse Aggregate- The aggregate having size more than 4.75mm is called as coarse Aggregates.
- The minimum particle size of fine aggregate is 0.075 mm
- The aggregates of rounded shape require minimum cement paste to make good concrete.
- The maximum size of coarse aggregate should not exceed one-fourth of the minimum dimension of the plain concrete member.
- the maximum size of coarse aggregate should not exceed one-fifth of the minimum dimension of the reinforced concrete member
- The aggregates of 40 mm, 20 mm and 10 mm sizes are commonly used for concrete works.
- The aggregate is said to be flaky when its least dimension is three-fifth of its mean dimension
- The aggregate is said to be elongated when its length is equal to 1.8 times its mean dimension
- Bulk specific gravity of an aggregate is defined as the weight of oven dry aggregate divided by its absolute volume, including the natural pores in the aggregate particles
