What is a wet mix macadam?

What is a wet mix macadam?

Wet Mix Macadam Plant Wet Mix Macadam (WMM) is a relatively newer concept used for laying the base course, which is placed right before the hot mix asphalt during road construction. The binding materials used for the base in case of WMM are prepared in the plant and then brought to the site for overlaying and rolling.

What is bituminous macadam made of?

2.2 Bituminous macadam (BM) shall consist of mineral aggregate and appropriate binder, mixed in a hot mix plant and laid with a mechanized paver. It is an open graded mixture suitable for base course. It is laid in a single course or in a multiple layers on a previously prepared base.

What is the MoRT&H clause 406 for wet mix macadam?

Wet Mix Macadam shall be constructed as per the MORTH Specifications, Clause– 406 and also as per change made to various Sub-Clauses in Clause–406 furnished in Contract Technical Specifications. MDD & OMC shall be determined as per MORT&H clause 406 for the material so blended.

Does bituminous macadam trap moisture in the pavement?

2.3 Since the bituminous macadam is an open-graded mixture there is a potential that it may trap water or moisture vapour within the pavement system. Therefore, providing proper drainage outlet to the BM layer should be considered to prevent moisture-induce damage to the BM and adjacent bituminous layers.