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Comparison Of The Strength Of Concrete Produced With Coarse Aggregate In Different Location
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CHAPTER ONE
INTRODUCTION
1.1 BACKGROUND
Aggregates are very important constituent in construction work. They reduce shrinking, give body to concrete and effect economy. (Shetty, 2005). In road construction, aggregates are combined with asphalt binding medium to form a compound material. It can also be use with a stabilizer or by self for base and sub-base courses.
Aggregates are used in almost all construction works like:
1. Road bases and sub-bases
2. Asphalt concrete
3. Asphalt surface
4. Portland cement concrete
5. Rails and ballasts
6. Trench backfill
7. water filtration beds
8. Rip rap and gabion materials
Aggregates were earlier considered as a chemically inert material but now it has been found out that some of the aggregates are chemically active and also that some aggregate exhibit chemical bonds at the interface of aggregate and cement paste.
Aggregate can occur naturally or artificially. Naturally curing aggregates are particles resulting from the weathering of rocks. They can be gotten from rivers, say gravels and sand stone or crushed rock called chippings.
The mere fact that aggregate occupy 70-80 percent of the volume of concrete and 40 percent of asphalt concrete, has an impact on various characteristics and properties of concrete and asphalt.
To know more about concrete, it is important that one should know more about aggregate, which constitute the major volume.
In Nigeria, the basic sources of aggregate either for concrete work or road constructions are from those occurring naturally which are cheaper and readily available. The most widely used aggregate is crushed rock, which are blasted from natural depositions and crushed to different sizes depending on the purpose and use. The study of aggregates (their types, properties and test) is of great important to the Civil Engineering.
CHAPTER ONE -- [Total Page(s) 2]
Page 1 of 2
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