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Large-scale demolition sites are now part of normal day-to-day business in the construction industry. The ever increasing amounts of waste building materials call for an efficient system for re-use directly on the work site in order to avoid unnecessary transport of materials. Conditions at inner-city job sites in particular are scarcely comparable with those at a remote gravel pit or in a stone quarry, where noise pollution is not a major concern. Faced with advancing mechanisation and road traffic increasing beyond all proportion, law-makers are also trying to bring the problem of emissions under control by continually stipulating lower limits.

Cities like Mumbai, Kolkata, Chennai, Delhi, Hyderabad, and Bangalore have reusable construction and demolition materials produced through road demolitions, building demolition and rock excavations.With the extent of infrastructural reconstruction that is required to convert these cities into modern cities a very large quantity of C&D waste will be generated.

Chief Minister of Delhi Smt. Sheila Dikshit has taken a personal interest in ensuring environmental–friendly technologies for the construction sector in Delhi. Accordingly, at a meeting she directed that the Rubble Master Compact Recycler be tried out in one or two locations. The Engineer-in-Chief, Municipal Corporation of Delhi has selected a site at Shah Alam Bandh road where construction and demolition waste is being accumulated from the Inner city areas.

Until now, this construction and demolition waste is being transported along the congested arterial roads in heavy road vehicles, and dumped at Ghazipur creating further problems of space utilization at the dump site.

The concrete, bricks and other Rubble was crushed at the MCD site at Shah Alam Bandh road, near MCD Jehangirpuri Karamchari Quarters, near Jehangirpuri police station, New Delhi. The crushed products will be reused as building material in various applications. This will avoid wear and tear of roads by dumpers and save space at the Municipal Dumping grounds.

Compact Recycling

Compact recycling means sorting the materials to be processed into grade right on the job site. Sorted, high quality recycled building materials can be used best of all in their entirety directly at the work site or at a nearby building site. The use of recycled aggregate can save money for local governments and other purchasers, create additional business opportunities, save energy when recycling is done on site, conserve diminishing resources of urban aggregates, and help local governments meet environmental goals.

Rubble Master

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HMH Engineering-Consulting-Trading GmbH, headquartered in Linz, Upper Austria, has been developing and marketing mobile Rubble Master Compact Recyclers since 1991. These machines are highly efficient compact units used for both the conventional processing of stone and earth and for the economical re-use of construction waste such as rubble, asphalt, concrete and broken roads. Rubble Master Compact Recycling machines have now been launched in India by BHP Infrastructure.

Rubble Master introduced the concept of compact recycling in 1993 and has been devoted to setting standards in environmentally acceptable recycling. Here too, high efficiency and economy are of the essence – not forgetting machines that are already extremely environmental–friendly as they can be used on the job site, saving transport as a result.

BHP Infrastructure Pvt Ltd., Faridabad recently introduced the Rubble Master RM80 track mounted Compact Recycling Machine on behalf of HMH Engineering GmbH of Austria. BHP Infrastructure is the distributors for HMH and market and support their products in India.

Demolition Rubble

With environmentally compatible Rubble Master Compact Recyclers, even smaller amounts of concrete, asphalt and mineral-based building material can be processed efficiently and inexpensively. It also makes it much easier to control the flow of materials. This in turn reinforces the service character of the building contractor; he cannot only use this service in his own work, but he can also offer it to local authorities. In every situation, there are substantial savings made in transport and tipping costs, as well as in the procurement of new materials. Plus, thanks to their compact dimensions and low transport weight, they can be put to work on even the most inaccessible inner city building sites.

With its low noise levels the first Rubble Master RM60 is also ideal for use in residential areas; the Rubble Master Enviro concept for minimum consumption and extremely low emissions was developed to comply with increasingly stringent guidelines. From the outside you can see the special cover over the crusher to suppress crushing noise. Selected materials have also been fitted to the crusher inlet to reduce noise. Noise reduction is enhanced even further by an optimised exhaust system. Inside the machine, a finely tuned low-emission diesel engine shows how important environmental impact is for Rubble Master machines. An intelligent dust suppression system is fitted at several points to cut down on airborne particles – both in the crusher and on the discharge conveyor belt.

Ideal for road construction

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A roadway is built in several layers: pavement, base, and sometimes subbase. The pavement is the surface layer, and is made of PCC or AC. The base layer supports the pavement, and is made of aggregate base (AB). The sub base layer supports the base and is made of aggregate sub base (ASB). According to Batra, recycled aggregate can be used in paved roads as aggregate base, aggregate subbase, in gravel roads as surfacing, as base for building foundations, and as fill for utility trenches.

Benefits

The recycling of building materials is the logical consequence of an approach which is based on sustainability and cyclic processes. Recycling helps save resources and reduce waste and traffic.
  • The re-use of building materials is in compliance with the law
  • The acceptance charge for waste building materials is lower than the contribution for the removal of hazardous waste which dates back to past activities
  • The re-use of waste building materials saves valuable tipping space
  • The utilisation of recycled building materials has a positive impact on the limited natural original sources of raw materials.
  • The possible applications of recycled building materials are varied; they range from verge filling to agricultural and forestry path making, sports facilities and high-quality civil engineering works.
  • Today recycled building materials are equal to natural building materials and are subjected to continuous checks as grade-certified quality materials.
  • Recycled mineral material is in many respects even superior and offers various additional benefits (e.g., better binding strength).
  • The direct positive impact on the environment is also worthy of note, e.g., countless kilometres of transport are no longer necessary.
  • Recycling contributes towards making our living space worth living in–also for generations to come.
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