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Test your basic knowledge |
Civil Engineering Materials
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Study First
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. Nonpotable/potable >90% - the acceptable
Bag of Cement
metamorphic
Potable Water
capillary voids
2. Air bubbles for sapce for water to expand when freezes
map cracking
Air Entrainer Admixture 1
Potable Water
slump
3. Intentional well distributed air - up durability - adds strength
scaling
joint faulting
concrete
entrained air
4. Good stability
Deposit concrete
scaling
Potable Water
well graded mix (med fineness)
5. Heat and pressure ex- marble - quaertzile
metamorphic
Type III Cement
capillary voids
fineness modulus
6. makes it mushier because cement grains more distributed
angular and rough agg
Water Reducer Admixture 2
interlayer hyrdration space
entrained air
7. Low stability
entrained air
slump
high fineness
concrete
8. Bending moment - no shear in middle third
free water
joint faulting
3 point loading flexure test
Type V Cement
9. Crush clinker into super fine powder
scaling
ball mill
round and smooth agg
Water Cement Ratio
10. Near surface water is cause
ball mill
water bleeding or pumping
Water Cement Ratio
joint faulting
11. max is 12 in - more free water= more slump
round and smooth agg
water-reducer
slump
self consolidating concrete SCC
12. Water used for hydration - water beyond SSD - min- .22-.25 - typical- .4-.5 (.44) - lower WC ratio = more strength -
gypsum
longitudinal cracking
transverse cracking
Water Cement Ratio
13. Cement paste has bulk SG< cement particles
Type II Cement
concrete
well graded mix (med fineness)
capillary voids
14. Trim subgrade - moisten subgrade - compact (use vibratory roller) - do NOT deposit frozen subgrade or disturb it - uniform - NO water added in front of paver -
Deposit concrete
C3S
Type I Cement
Steps to place concrete
15. Sum of cumul % retained / 100 - higher= bigger particle sizes= smaller amount of agg needed
entrapped air
Type I Cement
fineness modulus
Kiln
16. High sulfate resistence -
Steps to place concrete
concrete
Type V Cement
gypsum
17. Do NOT dump in separate piles - deposit in large piles -
Corner break
well graded mix (med fineness)
Deposit concrete
3 point loading flexure test
18. To increase stability of materials - reduce rutting
angular and rough agg
pozzolan
entrapped air
Accelerators Admixture 5
19. Volcanic - hardening and crystal molten material ex- granite
Igneous
angular and rough agg
slump
paste
20. Low Heat of Hydration- for careful control of heat - dams
joint faulting
3 point loading flexure test
water-reducer
Type IV Cement
21. From chemicals or excessive drying
high fineness
Concrete Construction
map cracking
transverse cracking
22. Tricalcium silicate (C3S) - dicdalcium silicate (C2S) - tricalcium aluminate (C3A) - tetracalcium aluminoferrite (C4AF)
angular and rough agg
entrained air
Potable Water
Cement compounds
23. Slow down rate of aluminate hydration -produces sulfate ions - flash set - false set in excess - higher rate of C-S-H (strength)
gypsum
Water Cement Ratio
Retarder Admixutre 3
Type II Cement
24. Cement+sand
Type IV Cement
patches
mortar
gypsum
25. To improve workability for fresh concrete
interlayer hyrdration space
water bleeding or pumping
Air Entrainer Admixture 1
round and smooth agg
26. Ups set time
Cement compounds
Type V Cement
pozzolan
Bag of Cement
27. High Early Strength- fast track projects - we want low set time
Igneous
Bag of Cement
joint faulting
Type III Cement
28. Flowable - nonsegregating
patches
self consolidating concrete SCC
paste
Consolidate
29. Sometimes worse
transverse cracking
patches
Type II Cement
Kiln
30. Delay initial set - for long hauls or unusual placement
Concrete Construction
Retarder Admixutre 3
Cement (Portland) ingredients
fineness modulus
31. Distributes cement grains - cement becomes more mushy -
paste
nominal max aggregate size
metamorphic
water-reducer
32. Corner was hotter on top than bottom - it warped and lifted - pressure makes corner crack -
paste
Corner break
Accelerators Admixture 5
round and smooth agg
33. Calcareous (calcium) - argillaceous (aluminum) - iron oxide (iron) - gypsum (silicon)
Cement (Portland) ingredients
Excess water
Corner break
Potable Water
34. Water beyond SSD condition
Curing
angular and rough agg
free water
Cement (Portland) ingredients
35. By vibrating - otherwise rock pockets occure -
round and smooth agg
Consolidate
Excess water
C3S
36. Ponding/immersion - spraying/fogging - wet coverings -impervious papers/plastic sheets - membrane forming - steam - insulating blankets/covers - electric/hot oil/ infrared -
Concrete Construction
Curing Types
fineness modulus
mortar
37. For continued hydration and strength gains - otherwise only 50% strength gained - ups durability and abrasion resistance - prevent shrinkage cracking -
self consolidating concrete SCC
joint faulting
Water Reducer Admixture 2
Curing
38. Stop and reactivate hydration process
Water Cement Ratio
Hydration Contoller Admixture 4
Accelerators Admixture 5
high fineness
39. For early strength gain
Type II Cement
longitudinal cracking
Potable Water
C3S
40. B/c of trucks over time
longitudinal cracking
joint faulting
scaling
Sedimentary
41. Normal- for general work
gypsum
Sedimentary
Air Entrainer Admixture 1
Type I Cement
42. Cement+water
nominal max aggregate size
Corner break
patches
paste
43. Greater =less free water needed to get a given slump
Consolidate
nominal max aggregate size
Kiln
Type IV Cement
44. Trapped air - reduces strength - ups permeabiity
Air Entrainer Admixture 1
mortar
entrapped air
scaling
45. Cement+course aggregate
paste
capillary voids
round and smooth agg
concrete
46. Early stength at faster rate - for cold temps
Deposit concrete
joint faulting
Accelerators Admixture 5
pozzolan
47. Stratified structure - disintegrated exitisting rocks - inorganice remains of marine animals - ex- limestone
Cement compounds
Sedimentary
patches
Kiln
48. Ups capilary voids - lowers strength
capillary voids
Excess water
Concrete Construction
paste
49. Consolidation - strike off - depress agg - darby or bull float - (TIME) - edging - jointing - floating - (TIME) - texturing - curing
Corner break
Concrete Construction
mortar
Curing
50. Heavy traffic
Concrete Construction
joint faulting
free water
fineness modulus
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