Materials II Quiz 1

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Effect of adding SP in terms of viscosity and stress
Viscosity equal, reduced stress
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Symbol for tricalcium aluminate?
C3A
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How do you reduce H+S Dermatitis?
Add ferrous or stannous sulphate
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Abbreviation for SIO2?
S
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How much CLAY:LIMES
15:85%
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Raw Materials of Cement?
Limestone (CaCO3), Clay, Shale, Mudstone
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How much cement and concrete is produced by the UK annually?
10, 50
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How can you inhibit flash set in a clinker?
Add calcium sulphate (Gypsum)
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How much Alite in a mix?
40-60%
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Which nomenclature products have fast hydration?
C3S, C3A
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What do pozzolans do?
No cement proprerties but react with lime in presence of water
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Tech. Benefits of SCM
Reduce porosity and permeability
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Which SCM is used to fill capillary porosity?
CSF
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What Nomenclature product does LHPC have a great deal of?
C2S
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Which SCM has a high alkali content?
PFA
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pH of SCM
9-12
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In GGBS, which is molten **** cooled quickly and granulated?
Keeps glassy- More reactive
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What product gives grey colour to concrete?
Ferrite
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Volume of Air entraining agents required?
4-7%
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Result of Air Ent. Agents on Workability and Cohesion?
Both increase
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Which SP is used as a retardant?
Lignosulphates
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How do retarders work?
Molecules coat layers of cement grains to prevent access of water
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Why was Calcium Chloride banned?
Rusting steel
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Substitutes for Calc. Chloride?
Calcium Formate, Sodium Aluminate
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How do SPs work?
Organic molecules physically absorbed onto cement grains and then grains repulse each other
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Super plasticiser as a water reducer?
Pre-cast beams
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What Admixture resists frost?
Air entraining agents
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Size of Air bubbles from an Air Entraining agent?
0.02-1mm
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Symbols for the two aluminates involved in cement hydration?
C3A, C4AF
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What is AFt and when does it form in minutes?
Ettringite during flash set
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Materials present after 1 day of hydration?
CSH, Portlandite, AFt
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Minimum W/C for all Cement to hydrate?
0.22
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Practical W/C where value enables compaction, but still strong?
0.4-0.65 (0.33 HS, 0.8 Low)
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What percent of air voids remains in well compacted concrete?
2-4%
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Out of CH, AFT, CSH and C2S, What is long and sharp, rounded, cloudy and pale
AFt Sharp, CH rounded, C2S pale,, CSH cloudy
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How can you prevent bleeding of concrete?
Add CSF or AEA
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How can you prevent Segregation?
Add PFA
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Result of poor initial compaction?
Plastic Settlement
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What is PFA used for?
Improved cohesion
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What can be the result of poor curing on the strength?
Reduction of >50%
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Influence of increasing Fine/Coarse ratio on stress and viscosity?
Increase stress, Reduce viscosity
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Negative of increasing fine/coarse ratio?
Test mixes required as it's not reliable
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Nanometres in a mm
100000
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Name of voids in which hard cement paste arises due to poor work and workmanship?
Gross pores
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Name of voids in hard cement paste when previous water filled gaps are not filled with hydration products?
Capillary
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What DON'T Calcium sulphate and iron sulphate provide upon drying?
Make concrete more resistant to degradation
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Which agg. produces Light Weight cement?
Pumice
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How does RHPC attain it's properties?
Finer grind, increased C3S
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Why is calcium sulphoaluminate used in mining?
It's expansive- doesn't shrink
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When would CSF be added to concrete
Produce HSC
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Why is abutment of M4 motorway in Ireland lighter in colour than bridge deck?
GGBS
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Boundary of Norm-High strength?
60MPa
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Proportion of Ultimate Strenth after 28 days?
75%
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Other cards in this set

Card 2

Front

Symbol for tricalcium aluminate?

Back

C3A

Card 3

Front

How do you reduce H+S Dermatitis?

Back

Preview of the front of card 3

Card 4

Front

Abbreviation for SIO2?

Back

Preview of the front of card 4

Card 5

Front

How much CLAY:LIMES

Back

Preview of the front of card 5
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