waste material usage

waste material usage - Large quantities of waste materials...

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Large quantities of waste materials and by-products are generated from manufacturing processes, service industries and municipal solid wastes, etc. As a result, solid waste management has become one of the major environmental concerns in the world. With the increasing awareness about the environment, scarcity of land-fill space and due to its ever increasing cost, waste materials and by-products utilization has become an attractive alternative to disposal. High consumption of natural sources, high amount production of industrial wastes and environmental pollution require obtaining new solutions for a sustainable development. Utilization of waste materials and by-products is a partial solution to environmental and ecological problems. Use of these materials not only helps in getting them utilized in cement, concrete, and other construction materials, it helps in reducing the cost of cement and concrete manufacturing, but also has numerous indirect benefits such as reduction in land-fill cost, saving in energy, and protecting the environment form possible pollution effects. Further, their utilization may improve the microstructure, mechanical and durability properties of mortar and concrete, which are difficult to achieve by the use of only ordinary Portland cement. Latest researches are on the use of fly ash, clean coal ash, coal bottom ash, foundry sand, waste glass and RHA in cement-based materials. Recycling involves processing used materials into new products to prevent waste of potentially useful materials, reduce the consumption of fresh raw materials, reduce energy usage, reduce air pollution (from incineration ) and water pollution (from landfilling ) by reducing the need for "conventional" waste disposal, and lower greenhouse gas emissions as compared to virgin production. [1] [2] Recycling is a key component of modern waste reduction and is the third component of the " Reduce , Reuse , Recycle" waste hierarchy . Recyclable materials include many kinds of glass , paper , metal , plastic , textiles , and electronics . Although similar in effect, the composting or other reuse of biodegradable waste – such as food or garden waste – is not typically considered recycling. [2] Materials to be recycled are either brought to a collection center or picked up from the curbside, then sorted, cleaned, and reprocessed into new materials bound for manufacturing. In a strict sense, recycling of a material would produce a fresh supply of the same material, for example used office paper to more office paper, or used foamed polystyrene to more polystyrene. However, this is often difficult or too expensive (compared with producing the same product from raw materials or other sources), so "recycling" of many products or materials involves their reuse in producing different materials (e.g., paperboard ) instead.
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waste material usage - Large quantities of waste materials...

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