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What Is DBM? Dense Bituminous Macadam (DBM) is a type of road surface course that plays a crucial role in the construction of durable and resilient highways. Comprising a mix of graded aggregates, filler, and bitumen, DBM is designed to provide a strong and wear-resistant layer to withstand the stresses imposed by vehicular traffic. The … Read more
METHODOLOGY FOR EARTHWORK IN EXCAVATION
(Acceptance Criteria: Ref. Section 300 of MORT&H) excavation by mechanical means in all types of strata, in rock by wedging/rock splitting or line drilling using pneumatic equipment and expanding agents, chiselling including dressing to final line, level, grades, cross-section as shown in drawings for roadway, drains, shoulders, median
Applying a single coat primer of bitumen Cationic emulsion only in good weather. Application equipment includes a primer distributor and a self-propelled sprayer. The road surface is cleaned before primer application. The primer is sprayed uniformly over the dry surface. The primed surface is then left to cure for at least 24 hours. Excess primer is blotted with sand and care is taken to avoid over priming.
METHODOLOGY FOR CLEARING GRUBBING AND DISMANTLING STRUCTURES(Acceptance Criteria: Ref. Section 200 of MORT&H) Scope: This work shall consists of cutting, removing and disposing of all materials such as trees, bushes, shrubs, roots, grass, weeds, top organic soil not exceeding 150mm’ Dismantling of structures acquired within ROW in brick work, stone masonry, plain/ reinforced concrete, timber … Read more
METHODOLOGY FOR EMBANKMENT & SUBGRADE CONSTRUCTION (Acceptance Criteria: Ref. sec. 305of MORT&H) construction of embankment including subgrades; earthen shoulders, median and rock fill in embankment by mechanical means with approved materials from roadway excavation or borrow pits.
methodology for constructing a granular sub base (non-bituminous). It includes preparation of subgrade, equipment requirements such as a crusher and roller, and usage of crushed stone material. The procedure involves layering and compacting the material, checking and adjusting moisture content, and rolling until a specific compaction percentage is reached. Traffic arrangements during construction should comply with MORT&H 112.