aggregates ppt - aa
TRANSCRIPT
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AUYONG SIOK MAY SANDRA
AYE AYE AUNG
BEH HOOI WOON
CHAN NGET LOONGCHEN DEJUN
CHEN KANG
CHEN XINCHEN LEI
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IntroductionBenefits of Aggregate
Factors affecting Strength of Concrete
Classification of Aggregate (Size, Source, Density)
Aggregate Production
Sampling of Aggregate
Properties of Aggregate
(to be filled by the rest of team for individual sections)
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Composition of ConcreteAirPortland CementGravel of Crushed Stone (Coarse Aggregate)Sand (Fine Aggregate)
Water
At least three-quarters of the volume of concreteis occupied by aggregates
Aggregate is importance because it influencesthe performance of concrete
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Cheaper use of coarser aggregates lowers cost of
concrete mix by reducing cement requirements economical filler of 60-80% by volume in
concrete Higher volume stability Rigid and strong compared to cement paste
Better durability
Provides ductility in concrete
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Strength of the aggregate(e.g. surface texture, cleanness, particleshape, maximum size)
Shrinkage and creep(e.g. stiffness, grading)
Abrasion(hardness)
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SIZE
Coarse aggregates (>5mm) Fine aggregates (
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Maximum aggregate size: The largest sieve size thatallows all the aggregate to pass through
Nominal maximum aggregate size: The sieve sizethat less than 10 % of aggregate retain on it
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Quarrying Crushing
Primary: Jaw crusher
Secondary: Gyratory, roller, impact
Screening or Sieving
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Heavyweight Aggregate 4,000 - 8,500 kg/m3 Use in production of concrete for radiation
shielding
Normal Aggregate 2,300 2,500 kg/m3 Use in normal concrete
Lightweight Aggregate 350 1,100 kg/m3 Use in lightweight concrete production that provide
thermal insulation and fire resistance properties
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Get the sample randomly from entire width ofstock pile i.e. from top, middle & bottom atseveral locations
Use splitting or quartering Method until toget the required amount of aggregate samplefor testing
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Aggregate properties are used to determine:Suitability for a particular application
Specific concrete mix design
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Shape and Texture Soundness & Durability
Hardness and abrasion resistance
Absorption Specific gravity
Strength
Gradation
Cleanness and deleterious materials Alkali-aggregate reactivity
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Particle shape affect the workability of freshconcrete
Higher surface to volume ratio: require morecement paste to coat aggregate surface
Irregular particles: Greater interaction betweenaggregate particles and reduce workability offresh concrete
Rounded particle shape need less cement pastethan angular shape at same workability.
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Beh Hooi Woon Pg22-30
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Chen Nget Loong Pg31-39
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Chen Dejun Pg40-48
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Chen Kang Pg49-57
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Chen Xin Pg58-66
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Chen Lei Pg67-74
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THANK YOU