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AGGREGATE (DEFINITION (inert filler materials ; sand & stone (making…

- - - - particle that all passes through 4.75 mm sieve
      - aggregate with size less than 5 mm and retain on 0.075 mm sieve
    - - aggregate passing through 75 mm sieve
      - entirely retain on 4.75 mm sieve or those aggregates with size greater than 5 mm
  - - - taken from native deposits without any change in their natural states during production except for crushing, grading or washing
        
        example : sand, gravel, crushed stone, lime rock
    - - comprise blast-furnace slags and cinder, fly ash, etc.
        
        cinders are residue of coal or wood after burning
      - PROCESSED AGGREGATES
        
        heat treated, expanded materials with lightweight characteristics
        
        example : perlite, burnt clays, shale, processed fly ash
      - COLORED AGGREGATE
        
        glass, ceramics, manufactured marble for decorative and architectural purposes.
  - - - solidification of molten lava forms igneous rocks
        
        high strength concrete
        
        example : quartz, granite, basalt, obsidian, tuff
    - - obtained by the deposition of weathered and transported preexisting rocks
        
        example : sandstone, limestone, shale
      - IMPORTANT
        If these are hard and dense, OK. If not, high absorption capacity gives unsatisfactory results.
    - - formed at a depth under high heat and pressure by the alternations of either igneous rocks or sedimentary rocks
        
        example : marble, slate, schist
      - IMPORTANT
        If hard and dense, OK.
        If laminated, undesireable.