Construction aggregate, or simply aggregate, is a broad category of coarse- to medium-grained particulate material used in construction including sand, gravel, crushed stone, slag, recycled concrete and geosynthetic aggregates. Aggregates are the most mined materials in the world . Materials which are large to be retained on 4.7 mm sieve size are called coarse aggregate , and its maximum size can be upto 63 mm ."
Crushed stones are generally obtained by blasting in stone quarries and breaking them by hand or crusher machines thereafter. Hand broken stones are generally available in one size only, and in colloquial language it is called " Balest ". In the other side machine - crushed stones contains various kind of sizes .
Different sizes of stone chips and their uses:
Common uses – for drainage and decorative usage. The high PSV 10mm can be used for decorative,
drainage and asphalt aggregate to BS EN 13043.
Common uses – Building construction,
Aggregate for road construction and maintenance.
Any kind of construction. This size of stone is most commonly used in construction.
for R.C. work [ roofs ,floors, Stairs in buildings ] maximum size should be 15mm [5/8 inch] .
Common uses – 20mm cubicled engineered aggregate that can help in optimum mix-design and improved quality of concrete.
for R.C. work [ beams,columns, slabs in buildings ] maximum size should be 20mm [3/4 inch] .
4. 40mm Size Stone Chips :
Common uses – 40mm cubicled engineered aggregate that helps better mix during construction is best suitable for constructions of road, railway track works etc.
For R.C. foundation work, maximum size should be 40mm[1.5 inch] .
4. 60mm Size Stone Chips :
Common uses – Greater then 50 mm are called stone ballast. It is used in road construction. The stone chips of size 40 to 60 mm are generally used in road construction in the base and sub-base.
It should neither be too soft nor too hard. It should be slightly porous also, so that a compact base can be prepared with the addition of Murrum etc
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