TYPES OF ROAD AGGREGATES
The raw material which is used as road aggregates can be classified in the following two categories:
(1) Natural aggregates: The term natural aggregate is used
loosely to designate aggregates which need only be removed from their natural deposits as unconsolidated sediments. The aggregates obtained from such deposits are called gravel and sand while those produced from rock, boulders or cobble stones are known as cmshed stone. Thus, the natural aggregates can be divided into the following three types:
a Crushed rock aggregate b. Gravel c. Sand
(2) Artificial aggregates: The blast furnace slag is perhaps the
only artificially prepared aggregate which is used in the road construction it is obtained as a by-product in the manufacture of steel If slag is specially manufactured under controlled conditions, it can certainly prove to be an excellent road aggregate of uniform quality.
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