Screening machine in recycled concrete aggregate

Concrete waste recycling and being used in the construction industry is already accepted.  In the process, screening and separation are the most important processing part, so the liner is a must in production. The secondary screening for construction aggregates is an issue worthy of considering. Because concrete is a kind of high strength dense paste mass which consists of aggregate, fine aggregate and cement paste. Aggregate Gradation is directly related to the density of concrete. Indicators for aggregates evaluation are sand particle size, material screening results (judgment grade), the mud content and organic matter loss content on ignition.
Cement concrete comes into being since an earlier time, and it plays an important positive role for construction and building industry. However, with time goes, there are generating more and more concrete waste, which caused serious environmental problems. For example, we say it 2 billion m3 of concrete storage in China at present, which needs 0.8 billion tons cement and natural sand consumption is at least 3.6 billion tons. Statistics shows that we product 1 ton cement will use 0.95~0.98 ton clime, and 1 ton aggregates will discharge about 1 ton CO2. At the same time, it will let out a large amount of harzadous gas and dust. In aggregates proportion, natural sand takes much account. While as endless mining for decades, some natural resource can't meet large demand. What' more, natural limestone with industrial value just is able to keep supplying for 30 or 40 years. Over-exploitation has lead to earth losing and environment worsen. It has a bad effect to natural resources sustainable development. According to incomplete statistics, China generates annual construction waste 0.1 billion tons at present speed. If these construction wastes could be used in a proper way, it makes sense greatly.
Recycled concrete aggregate refers to that we make use of old concrete waste to produce artificial sand. The production process includes selection, crushing and screening, and artificial sand has a certain physical performance and certain particle size. In the process, vibrating screen will remove foreign materials, and then the waste past through crushing by . Finally, the particle size, roughness, density and water taking property are decided by customers' demands. Therefore, the vibrating screen is also made object to users' demands. It may be no easy to determine number of screens since the different grain size. As there are different measuring standard from country to country, the measure unit "mesh" sometimes is difficult to come into agreement.

Original link: