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چون برای طرح های مختلف راهسازی نوعی دانه بندی مخصوص مورد نیاز است، ابتدا با توجه به نوع مشخصات سرند(الک)های مورد نیاز را باید مشخص کرده و روی هم چید. واضح است سرندها (الک) از بالا به پایین مواد درشت تر را رد میکنند. پس از ۲ دقیقه تکان دادن آنقدر این کار را ادامه می دهند تا تمامی مصالح درجه بندی و الک …
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