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Civil Engineering Materials
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Subject
:
engineering
Instructions:
Answer 50 questions in 15 minutes.
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Match each statement with the correct term.
Don't refresh. All questions and answers are randomly picked and ordered every time you load a test.
This is a study tool. The 3 wrong answers for each question are randomly chosen from answers to other questions. So, you might find at times the answers obvious, but you will see it re-enforces your understanding as you take the test each time.
1. max is 12 in - more free water= more slump
slump
ball mill
3 point loading flexure test
Retarder Admixutre 3
2. Moderate Sulfate Resistance- large piers
Retarder Admixutre 3
paste
water-reducer
Type II Cement
3. Ups capilary voids - lowers strength
Concrete Construction
Curing Types
Excess water
scaling
4. Stop and reactivate hydration process
Air Entrainer Admixture 1
paste
Hydration Contoller Admixture 4
interlayer hyrdration space
5. From chemicals or excessive drying
Cement compounds
Air Entrainer Admixture 1
map cracking
Curing
6. Loss of water from paste (evap) - 1% vol lowers - cracking - prevent by water loss control -
Consolidate
round and smooth agg
nominal max aggregate size
plastic shrinkage
7. makes it mushier because cement grains more distributed
Water Reducer Admixture 2
interlayer hyrdration space
free water
Bag of Cement
8. Bending moment - no shear in middle third
mortar
fineness modulus
3 point loading flexure test
Curing Types
9. 94 lbs
mortar
fineness modulus
Bag of Cement
Deposit concrete
10. Ups set time
pozzolan
Type V Cement
Type IV Cement
C3S
11. Cement+course aggregate
concrete
gypsum
Type IV Cement
capillary voids
12. Crush clinker into super fine powder
Type I Cement
Sedimentary
ball mill
Type IV Cement
13. Ponding/immersion - spraying/fogging - wet coverings -impervious papers/plastic sheets - membrane forming - steam - insulating blankets/covers - electric/hot oil/ infrared -
map cracking
capillary voids
Bag of Cement
Curing Types
14. Water used for hydration - water beyond SSD - min- .22-.25 - typical- .4-.5 (.44) - lower WC ratio = more strength -
Corner break
Type III Cement
Water Cement Ratio
map cracking
15. High Early Strength- fast track projects - we want low set time
Cement compounds
Air Entrainer Admixture 1
Type V Cement
Type III Cement
16. Source of hotgases - biggest piece of moving equipment
mortar
3 point loading flexure test
Curing Types
Kiln
17. Freeze-thaw cycles - bad curing or too much water
scaling
fineness modulus
Cement compounds
self consolidating concrete SCC
18. For early strength gain
C3S
Water Cement Ratio
entrapped air
nominal max aggregate size
19. Heavy traffic
Steps to place concrete
Curing Types
Water Cement Ratio
joint faulting
20. Space between layers in CSH - water in interparticle space held by hydrogen bonds
interlayer hyrdration space
transverse cracking
Type III Cement
nominal max aggregate size
21. Tricalcium silicate (C3S) - dicdalcium silicate (C2S) - tricalcium aluminate (C3A) - tetracalcium aluminoferrite (C4AF)
plastic shrinkage
Kiln
Cement compounds
3 point loading flexure test
22. Volcanic - hardening and crystal molten material ex- granite
water bleeding or pumping
capillary voids
Potable Water
Igneous
23. Heat and pressure ex- marble - quaertzile
Curing Types
fineness modulus
metamorphic
patches
24. Calcareous (calcium) - argillaceous (aluminum) - iron oxide (iron) - gypsum (silicon)
Bag of Cement
Consolidate
free water
Cement (Portland) ingredients
25. By vibrating - otherwise rock pockets occure -
metamorphic
Consolidate
Type V Cement
3 point loading flexure test
26. To increase stability of materials - reduce rutting
angular and rough agg
plastic shrinkage
mortar
water bleeding or pumping
27. Flowable - nonsegregating
self consolidating concrete SCC
Type II Cement
longitudinal cracking
Bag of Cement
28. Air bubbles for sapce for water to expand when freezes
Retarder Admixutre 3
Cement compounds
Air Entrainer Admixture 1
interlayer hyrdration space
29. Low stability
Retarder Admixutre 3
high fineness
free water
Consolidate
30. Slow down rate of aluminate hydration -produces sulfate ions - flash set - false set in excess - higher rate of C-S-H (strength)
Consolidate
gypsum
Steps to place concrete
Igneous
31. Intentional well distributed air - up durability - adds strength
entrained air
plastic shrinkage
Potable Water
Type II Cement
32. Sum of cumul % retained / 100 - higher= bigger particle sizes= smaller amount of agg needed
Deposit concrete
fineness modulus
Hydration Contoller Admixture 4
Retarder Admixutre 3
33. Corner was hotter on top than bottom - it warped and lifted - pressure makes corner crack -
Type V Cement
Type II Cement
round and smooth agg
Corner break
34. To improve workability for fresh concrete
water bleeding or pumping
round and smooth agg
Type V Cement
Steps to place concrete
35. Distributes cement grains - cement becomes more mushy -
free water
Water Cement Ratio
water-reducer
Hydration Contoller Admixture 4
36. Sometimes worse
Potable Water
Cement compounds
patches
Type III Cement
37. Early stength at faster rate - for cold temps
Excess water
Accelerators Admixture 5
map cracking
Kiln
38. Stratified structure - disintegrated exitisting rocks - inorganice remains of marine animals - ex- limestone
Sedimentary
Consolidate
joint faulting
patches
39. Do NOT dump in separate piles - deposit in large piles -
Deposit concrete
slump
Air Entrainer Admixture 1
entrapped air
40. Nonpotable/potable >90% - the acceptable
Potable Water
Cement (Portland) ingredients
3 point loading flexure test
Accelerators Admixture 5
41. Trim subgrade - moisten subgrade - compact (use vibratory roller) - do NOT deposit frozen subgrade or disturb it - uniform - NO water added in front of paver -
C3S
entrapped air
Steps to place concrete
mortar
42. Water beyond SSD condition
Steps to place concrete
free water
paste
Type IV Cement
43. Delay initial set - for long hauls or unusual placement
round and smooth agg
Retarder Admixutre 3
Type II Cement
gypsum
44. Cement+water
paste
Igneous
Air Entrainer Admixture 1
slump
45. Greater =less free water needed to get a given slump
nominal max aggregate size
Bag of Cement
free water
water bleeding or pumping
46. Low Heat of Hydration- for careful control of heat - dams
Bag of Cement
Type IV Cement
high fineness
map cracking
47. For continued hydration and strength gains - otherwise only 50% strength gained - ups durability and abrasion resistance - prevent shrinkage cracking -
Excess water
Retarder Admixutre 3
Type III Cement
Curing
48. Cement paste has bulk SG< cement particles
Potable Water
Excess water
mortar
capillary voids
49. Cement+sand
mortar
Accelerators Admixture 5
Type I Cement
Sedimentary
50. B/c of trucks over time
longitudinal cracking
Type I Cement
3 point loading flexure test
mortar
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