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7/23/2019 Aggregates Presentation
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Concrete Aggregates
Materials Anon
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What are aggregates?
Aggregates are simply any collection of rocks. In the aggrega
industry, these rocks are classified as crushed stone, sand, a
gravel.
We use aggregates every day. Streets, bridges, roads a
sidealks are made of concrete or asphalt hich is mostly maup of aggregates combined ith a binder that acts like gl
Concrete is used in foundations and basements for houses. !t
buildings sometimes use concrete throughout their structures.
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&"ampled of Water 'hrough (orous Concrete
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'he Main )unctions of Aggregates
'o provide a mass of particles hich are suitable to resist t
action of applied loads $ sho better durability then ceme
paste alone.
'o reduce volume changes resulting from setting $ harden
process $ from moisture changes during drying.
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*atural and Artificial Aggregates
*atural aggregate# *ative deposits ith no change
their natural state other than ashing, crushing
grading. +sand, gravel, crush stone
Artificial aggregates# 'hey are obtained either as a bproduct or by a special manufacturing process such
heating. +manufacturing of industrial sludge or mari
clay.
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'ypes of Aggregate ocks
Igneous rocks# are formed by solidification of molt
lava. +granite
Sedimentary rocks# are obtained by deposition
eathered $ transported pre-e"isting rocks or solutio
+limestone
Metamorphic rocks# are formed under high heat
pressure alteration of either igneous $ sedimentary roc
+marble.
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)ine Aggregate
Sand and/or crushed stone
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Coarse Aggregate
0ravel and crushed stone . We used this type of aggregate in ouclass e"periment of porpous concrete mi"tures.
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eferences
Mamlouk, Michael S., and 2ohn (. 3anieski. Materials for Civil aConstruction &ngineers. *.p.# n.p., n.d. (rint.
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'hank 4ou