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CONSTRUCTION AGGREGATES

机译:建筑骨料

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Construction aggregates consist primarily of sand, gravel, crushed stone and, to a lesser degree, iron or steel slag, and recycled asphalt and concrete. Of the natural aggregates, crushed stone is used for most construction purposes. Crushed stone can be mined from a variety of rock types such as limestone, dolomite (dolostone), granite and granitic type rocks, basalt and gabbro (traprock), sandstones, schist, marble, gneiss, quartzite, rhyolite, calcareous marl, shells, volcanic cinder and scoria. Each of these rock types has particular physical and chemical properties that allows the rock to meet certain specifications set forth by the American Society of Testing Materials, the American Association of State Highway and Transportation Officials, the U.S. Army Corp of Engineers, individual state departments of transportation and individual private companies, such as the railroad.
机译:建筑骨料主要由沙子,砾石,碎石以及少量的铁或钢渣以及回收的沥青和混凝土组成。在天然骨料中,碎石用于大多数建筑目的。可以从各种岩石类型中开采碎石,例如石灰石,白云岩(白云岩),花岗岩和花岗岩类型的岩石,玄武岩和辉长岩(白云母),砂岩,片岩,大理石,片麻岩,石英岩,流纹岩,钙质灰泥,贝壳,火山灰和火山灰。这些岩石中的每一种都有特殊的物理和化学性质,使岩石符合美国测试材料学会,美国国家公路和运输官员协会,美国陆军工程兵团,各州的部门规定的某些规格。运输和私人公司,例如铁路。

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