Pioneered by scottish engineer john loudon mcadam around 1820 macadam is a type of road construction. If the wbm roads are maintained properly and from time to time, it can resist load of traffic of about 900 tonnes per lane per day. The water bound macadam road construction technique was given by the john macadam. They are constructed from locally available materials. Water bound macadam wbm shall consist of clean, crushed coarse aggregates. Nosegregation of 18 apply binding material, wherever required, in a similar fashion as screening. The construction cost of wbm road is comparatively low. This document is not intended to be comprehensive and therefore does not provide information on all construction activities. This technique in present day is used as given below. The broken stones of base and surface course,if any are bound by the stone dust is presence of moisture is called wbm.
Water bound macadam wbm road construction procedure. Steps in bituminous road construction the constructor. Bitumen road construction consists of various steps such as preparation of base course, application of bituminous. Wbm road construction procedure construction of water bound macadam road involves the following 6 basic steps as given below. Wbm water bound macadam and wmm wet mix macadam are used for road construction in base course layer. In the construction of wbm road no skilled labours are required.
In this video i will till you about water bound macadam and its general specification and required tests of wbm. Irc indian roads congress has classified the coarse aggregates into 9 grades. Draft guideline on maintenance of roa vuqlakku vfhkdyi,oa. Wbm stands for water bound macadam which is the most commonly used road construction procedure for over more than 190 years. Here we are going to discuss the construction of the wbm and wmm roads in brief. Wbm road construction procedure for wbm road highway. This procedure manual provides a guide to the correct onstruction c practices and procedures for use on road contracts by the roads and highways department. Wbm stands for water bound macadam, and the term wbm road was derived in the memory of an engineer by name macadam who designed and formulated this.
The existing surface is prepared by removing the pot holes or rust if any. Water bound macadam wbm road construction procedure duration. Preparation of subgrade preparation of subbase preparation of base preparation of wearing course preparation of shoulders opening to traffic step 1 construction of subgrade subgrade act as a cushion for other layers i. Wbm road construction procedure for wbm road highway engineering.
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