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various types of recyclable materials are currently used in civil engineering applications. these include tire shreds, ground tire rubber, fly and bottom ash, blast furnace slag, steel slag, cement kiln dust, silica fume, crushed glass, reclaimed asphalt pavement (rap), and rice husk ash.
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introduction of stone crusher. stone crusher is the necessary mining crushing machinery. it is widely used to crush all kinds of stones with soft, medium and high hardness such as gravel, rock, pebble, basalt, aggregate, barite, limestone fluorite, feldspar, dolomite, etc. stone crusher can be used for primary/secondary/fine crushing of the materials.
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the team examined stone tools used by homo erectus unearthed in saffaqah – which is about 200 kilometres west of saudi arabia's capital, riyadh – to try to work out why the species went extinct.
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