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Strength:
The strength of aggregates is determined from one of the three tests :
Aggregate Impact Test
In which the aggregates in a mould are subjected to impact caused by dropping a hammer giving 15 blows, and finding the percentage of crushed material, known as the Aggregate Impact Value. For base courses, a limit of 40 per cent is specified and for surfacing courses, a limit of 30 per cent is specified. Figure gives the arrangement of the testing apparatus.
(All dimensions are in millimetres)
Figure: An Aggregate Impact Test equipment
Properties of Stones The following properties of the stones should betake into account before choosing them for engineering works: Structure: The structure of the stone ca
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Maintenance of bituminous roads
A soft, normally consolidated clay layer is 18 m thick. The natural water content is 45%. The saturated unit weight is 18 kN/m 3 ; the grain specific gravity is 2.70 and the liqui
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why use wmm upon gsb can be laid dbm directly upon gsb
Use of Stone Aggregates in Road Construction Stone aggregates are extensively used in roads in pavement layers. They are obtained from natural rock. The following geological
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define alternative depths
Define Unit Hydrograph Hydrograph of one inch or 1cm of precipitation over a drainage basin area (watershed). It is the base hydrograph from which other hydrographs can be dete
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