RE-INTRODUCTION OF RUBBLE AS A BASE COURSE MATERIAL & ITS APPROPRIATENESS FOR THE Rural Road Construction ( PROGRAMME), IN PARTICULAR

ABC is a widely used road material for the construction of road bases. It has become more popular due to its easiness for handling. However it shows that comparatively large stones such as rubble (9”) can be used very effectively for the construction of road bases. Accordingly the rubble is proposed here for constructing the road bases together with ABC only as the filling material for covering the interstitial voids there in.

In the technical aspect, it gives more bearing capacity than ABC material.

Since it is big in particle size, more area involves, hence it can withstand more load & transfer more load to the ground with less settlement. As a result of this, rubble layer characterizes higher B.C. value.

Since rubble is big in particle size, more energy can be absorbed before crushing. Hence it is a big advantage to achieve stronger bases by using rubble than ABC material.

Other point is the less cost involved. It is cheaper material than ABC & mainly due to this reason the construction cost is reduced remarkably. Hence the rubble bases will be very attractive for constructing roads. Stronger base at a lesser cost is the main significance there in.

Even though, rubble has been used in traditional Mecadom construction earlier, it is stressed here that this proposal is different to it, due to involving well graded aggregate in place of uniformly graded aggregates which used in Mecadom construction. Hence the failures which had experienced in traditional method due to unfilled voids, lack of compaction, lack of compatibility & consistency in particle size etc. is avoided here by introduction of well graded ABC (GABC).