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Road consist of basically 4 layers 1 Sub grade The sub grade material should be clean and free from organic matter and should be able to be compacted by roller to form stable sub base The material should have the following characteristics

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WBM Stands for Water Bound Macadam which is the most commonly used road construction procedure for over more than 190 years Pioneered by Scottish Engineer John Loudon McAdam around 1820 Macadam is a type of Road Construction The broken stones of base and surface course if any are bound by the stone dust is presence of moisture is called WBM

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in WBM Roads 1 Coarse Aggregates Type of Coarse Aggregates Crushed rock Most Suitable Crushed slag Burnt bats Kankar Aggregate Laterite Screenings to be used as filler material Properties of Coarse Aggregates The crushed stone aggregates should be generally hard durable and of acceptable shape free fro flaky amp elongated particles

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Wood s definition Aggregate is an aggregation of sand gravel stone slag or any other material in combination with some cementing material attains higher engineering properties and form highway materials like WBM BM etc Road aggregate or simply aggregate is a broad category of coarse particulate material used in construction

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Aggregate crushing value test on coarse aggregates gives a relative measure of the resistance of an aggregate crushing under gradually applied compressive load Coarse aggregate crushing value is the percentage by weight of the crushed material obtained when test aggregates are subjected to a

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