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CLASSIFICATION OF AGRREGATES
- 1. CLASSIFICATION OF AGGREGATES POSITIVE ENGINEERING – BY VISWA JVMS
- 2. INTRODUCTION AGGREGATES ARE THE IMPORTANT CONSTITUENTS IN CONCRETE. AGGREGATES OCCUPY 70-80 PERCENT VOLUME IN A HARDENED CONCRETE AND THEIR IMPACT ON THE CHARACTERISTICS AND PROPERTIES OF CONCRETE IS CONSIDERED. AND WITHOUT THE STUDY OF CHARACTERS OF THE AGGREGATES, CONCRETE IS INCOMPLETE. CONCRETE IS CONSIDERED AS TWO PHASE MATERIALS FOR OUR CONVENIENCE; PASTE PHASE AND AGGREGATE PHASE.
- 3. CLASSIFICATION • BASED ON WEIGHT • BASED ON OCCURRENCE • BASED ON SOURCE • BASED ON SIZE • BASED ON SHAPE • BASED ON TEXTURE
- 4. Based on weight AGGREGATES ARE CLASSIFIED AS • ULTRA LIGHTWEIGHT AGGREGATES - • LIGHT WEIGHT AGGREGATES - • STRUCTURAL LIGHTWEIGHT AGGREGATES - • NORMAL WEIGHT AGGREGATES - • HEAVY WEIGHT AGGREGATES - Unit weight ( kg/ cubic meter) <500 500 – 800 650 – 1100 1100 – 1750 >2100
- 5. Based on occurrence Natural Sand, gravel, crushed rock such as granite, quartzite, basalt, sandstone Artifical Broken brick, Air cooled slag, Sintered fly ash, Bloated clay
- 6. Based on source ALMOST ALL NATURAL AGGREGATE MATERIALS ORIGINATE FROM BED ROCK. THESE ROCKS ARE IGNEOUS, SEDIMENTARY AND METAMORPHIC. IGNEOUS ROCKS – FORMED BY COOLING OF MAGMA SEDIMENTARY ROCK – FORMED BELOW THE SEA BED GENERALLY METAMORPHIC ROCK - EITHER IGNEOUS AND SEDIMENTARY ROCKS METAMORPHOSED DUE TO EXTREME HOT AND PRESSURE SOURCE FROM IGNEOUS ROCK – HIGH SATISFACTORY TO MAKE CONCRETE SINCE THESE ROCKS ARE NORMALLY HARD, TOUGH AND DENSE.
- 7. Igneous Rock
- 10. Based on size FINE AGGREGATE < 4.75 MM Coarse aggregate > 4.75 mm BASED ON SIZE IS CLASSIFIED AS FINE AGGREGATE AND COARSE AGGREGATE.
- 11. Based on shape SHAPE OF AGGREGATES IS AN IMPORTANT CHARACTERISTIC SINCE IF AFFECTS WORKABILITY OF CONCRETE. Classification Rounded Irregular Angular Flaky Example - river or seashore gravels, desert and wind blown sands - pit sands and gravels; land or dug flints; cuboid rock - crushed rock of all types; talus; screes - laminated rocks
- 13. Based on texture IT MEASURES THE RELATIVE DEGREE, IT DEPENDS ON HAEDNESS, GRAIN SIZE, POE STRUCTURE. Classification Glassy Smooth Granular Crystalline Honeycombed and porous Example - Black flint - Chert; slate; marble; some rhyolite - Sandstone; oolites - Fine : Balast; trachyte; medium : dolerite - Scoria; pumice, trass.
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