aggregates&slides21.05

aggregates&slides21.05 - Types of Aggregates...

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DJ Lavery Glacial Alluvial River Types of Aggregates Normal Aggregates Crushed rock Sedimentary Igneous Metamorphic Heavyweight Lead shot Iron shot Magnetite Sandstone Basalt Marble Limestone Granite Quartzite Dolerite Lightweight Artificial Recycled Broken brick Air cooled blast furnace slag Natural Pumice Expanded shale Artificial Furnace clinker PFA Foamed slag Sintered clay
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DJ Lavery Aggregate Shape
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DJ Lavery Lightweight Aggregate – Types
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DJ Lavery Desirable Properties of Aggregates Aggregates should : Provide good BOND - no accepted test Have adequate STRENGTH Must be greater than the concrete strength Have good ABRASION RESISTANCE And TOUGHNESS to withstand impact loads 10 40 400 100 Comp Str N/mm 2 Crushing Value (weaker aggs give higher no.)
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DJ Lavery Desirable Properties of Aggregates Aggregates should : Be free from IMPURITIES Be free from CHEMICALLY REACTIVE MINERALS Mica, iron pyrites Have appropriate POROSITY Affects bond, permeability & water absorption Have SOUNDNESS Ability to resist volume change From freeze thaw cycles, thermal changes, wetting & drying
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DJ Lavery Desirable Properties of Aggregates Aggregates should have: Compatible THERMAL PROPERTIES A different coefficient of thermal expansion than cement paste
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This note was uploaded on 11/24/2011 for the course SUR BLD115 taught by Professor Chapman during the Fall '11 term at Uni. Ulster.

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aggregates&slides21.05 - Types of Aggregates...

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