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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