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Topic-: Recycling of concrete aggregate

Presented by-: Saurabh. L. GundechaGuided by-: Prof. Pujari KJCOEMR

What is recycling? Recycling is processing of used materials into new products to prevent waste of potentially useful material, reduce the consumption of fresh raw material, reduce energy usage, reduce air pollution & water pollution by reducing the need of conventional waste disposal. In short, recycling is a key component for modern waste reduction.

Concrete recycling When structures made of concrete are demolished or renovated, concrete recycling is an increasingly common method of utilizing the rubble. Concrete was once routinely trucked to landfills for disposal, but recycling has a number of benefits that has made it a more attractive option in this age of greater environmental awareness & the desire to keep construction cost down.

Concrete aggregate collected from the demolition sites is put through a crushing machine. Crushing facilities accept only uncontaminated concrete, which must be free from trash, wood, paper & other such materials. Metals such as rebar, since they can be removed with magnets & other sorting devices & melted down for recycling elsewhere.

Why recycle concrete? Its high quality- meeting or exceeding all applicable state & federal specifications. It provides for superior compaction & constructibility. Its higher yield- recycled aggregates are lighter in weight per unit of volume, which means less weight per cubic yard, resulting in reduced material cost, haul costs & overall project cost. It weighs 10%-15% less than comparable virgin quarry products (concrete).

It offers a way to reduce landfill waste streams. It means minimisation of environmental impacts in an urban quarry setting.

Benefits There are variety of benefits in recycling concrete rather than dumping it or burying it in a landfill & some of them are as follows-: Keeping concrete debris out of landfills saves landfill space. Avoids haul-off costs & landfill disposal fees. Eliminate the expense of aggregate material imports & exports. Increase project efficiency & improve job cost.

Recycling one ton of cement could save 1360 gallons of water, 900 kg co2. Using recycled concrete as the base material for roadways reduces the pollution involved in trucking material. Produce specification sized recycled aggregates at your location.

Uses Crushed recycled concrete can be used as the dry aggregate for brand new concrete if it is free from contaminants. Larger pieces of crushed concrete, such as riprap, can be used for erosion control. With proper quality control at the crushing facility, well graded & aesthetically pleasing materials can be provided as a substitute for landscapping stone.

Smaller pieces of concrete are used as gravels for new construction project. Used as foundation for road pavements. Other applicable uses include Ready mix concrete, soil stabilization, pipe bedding & as a landscaping material.

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