The ideal gradation is seldom, if ever, met in naturally occurring deposits. No reputable manufacturer wants to recommend equipment if it has reasonable doubt about satisfactory performance on the job. In addition, a number of washing equipment manufacturers will examine and test samples to determine whether their equipment can do a job satisfactorily. Therefore, it’s important to test the source thoroughly beforehand to ensure the desired finished aggregate can be produced at a reasonable cost.Ī project materials engineer can be of immeasurable help in determining the economic suitability of material and, typically, must approve the source before production begins. Among these functions are the removal of clay and silt the removal of shale, coal, soft stone, roots, twigs and other trash sizing classifying or separating and dewatering.īecause no washing method is flawless – and because some materials may require too much time, equipment and water to make them conform to specifications – it is not always economically practical to use such materials. Specifically, though, there is more to the function of water in processing aggregate than mere washing. In the broadest terms, construction aggregate is washed to make it meet specifications. So it remains necessary to accept materials on the basis of some allowable percent of deleterious matter. Still, aggregate producers often find it difficult to meet all the requirements for “cleanliness.” While hydraulic methods are most satisfactory for cleaning aggregate to achieve desired results, they are not always perfect. Clean aggregate is a vital part of that effort. Materials engineers constantly strive to improve concrete and bituminous mixes and road bases. Manufactured sand is becoming more prevalent because of dwindling natural sand reserves and the constraints and expenses associated with mining natural sand and gravel near urban areas where material is needed most.
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