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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. To improve workability for fresh concrete
map cracking
Concrete Construction
round and smooth agg
water bleeding or pumping
2. Stop and reactivate hydration process
Hydration Contoller Admixture 4
fineness modulus
Type IV Cement
mortar
3. Low stability
Type V Cement
high fineness
Air Entrainer Admixture 1
transverse cracking
4. Delay initial set - for long hauls or unusual placement
Kiln
Retarder Admixutre 3
interlayer hyrdration space
Bag of Cement
5. misplaced joints - more specific- spalling- breaking away of edges
transverse cracking
gypsum
pozzolan
Type V Cement
6. Good stability
joint faulting
Kiln
well graded mix (med fineness)
patches
7. makes it mushier because cement grains more distributed
Corner break
Water Reducer Admixture 2
Concrete Construction
paste
8. High sulfate resistence -
Corner break
Bag of Cement
Type V Cement
round and smooth agg
9. Air bubbles for sapce for water to expand when freezes
well graded mix (med fineness)
Type III Cement
Bag of Cement
Air Entrainer Admixture 1
10. Water used for hydration - water beyond SSD - min- .22-.25 - typical- .4-.5 (.44) - lower WC ratio = more strength -
angular and rough agg
longitudinal cracking
Consolidate
Water Cement Ratio
11. Consolidation - strike off - depress agg - darby or bull float - (TIME) - edging - jointing - floating - (TIME) - texturing - curing
longitudinal cracking
Concrete Construction
Curing
Water Reducer Admixture 2
12. Flowable - nonsegregating
Bag of Cement
round and smooth agg
self consolidating concrete SCC
pozzolan
13. Nonpotable/potable >90% - the acceptable
Potable Water
self consolidating concrete SCC
Accelerators Admixture 5
Air Entrainer Admixture 1
14. Crush clinker into super fine powder
Curing Types
paste
entrapped air
ball mill
15. Trapped air - reduces strength - ups permeabiity
Curing Types
entrapped air
longitudinal cracking
Consolidate
16. Cement paste has bulk SG< cement particles
Cement compounds
Bag of Cement
water bleeding or pumping
capillary voids
17. For continued hydration and strength gains - otherwise only 50% strength gained - ups durability and abrasion resistance - prevent shrinkage cracking -
Water Cement Ratio
Curing
metamorphic
capillary voids
18. Freeze-thaw cycles - bad curing or too much water
Type III Cement
Excess water
scaling
Sedimentary
19. max is 12 in - more free water= more slump
entrained air
gypsum
Excess water
slump
20. Ponding/immersion - spraying/fogging - wet coverings -impervious papers/plastic sheets - membrane forming - steam - insulating blankets/covers - electric/hot oil/ infrared -
Curing Types
concrete
3 point loading flexure test
joint faulting
21. Bending moment - no shear in middle third
Type IV Cement
joint faulting
3 point loading flexure test
Type V Cement
22. 94 lbs
Bag of Cement
scaling
plastic shrinkage
Water Reducer Admixture 2
23. Space between layers in CSH - water in interparticle space held by hydrogen bonds
self consolidating concrete SCC
Kiln
Hydration Contoller Admixture 4
interlayer hyrdration space
24. Normal- for general work
capillary voids
nominal max aggregate size
concrete
Type I Cement
25. Cement+water
Accelerators Admixture 5
paste
Curing
gypsum
26. Near surface water is cause
water-reducer
Cement (Portland) ingredients
water bleeding or pumping
free water
27. Distributes cement grains - cement becomes more mushy -
Igneous
Excess water
water-reducer
well graded mix (med fineness)
28. Tricalcium silicate (C3S) - dicdalcium silicate (C2S) - tricalcium aluminate (C3A) - tetracalcium aluminoferrite (C4AF)
free water
round and smooth agg
Curing Types
Cement compounds
29. From chemicals or excessive drying
Accelerators Admixture 5
well graded mix (med fineness)
Retarder Admixutre 3
map cracking
30. Sum of cumul % retained / 100 - higher= bigger particle sizes= smaller amount of agg needed
Water Cement Ratio
C3S
fineness modulus
mortar
31. Do NOT dump in separate piles - deposit in large piles -
longitudinal cracking
Deposit concrete
fineness modulus
transverse cracking
32. Low Heat of Hydration- for careful control of heat - dams
fineness modulus
Type IV Cement
patches
Sedimentary
33. For early strength gain
C3S
fineness modulus
nominal max aggregate size
interlayer hyrdration space
34. Water beyond SSD condition
map cracking
Consolidate
free water
Water Cement Ratio
35. Slow down rate of aluminate hydration -produces sulfate ions - flash set - false set in excess - higher rate of C-S-H (strength)
gypsum
free water
Curing Types
Sedimentary
36. Moderate Sulfate Resistance- large piers
entrapped air
Potable Water
Type II Cement
map cracking
37. Volcanic - hardening and crystal molten material ex- granite
Igneous
Type III Cement
well graded mix (med fineness)
water bleeding or pumping
38. Cement+course aggregate
Type IV Cement
Curing
Igneous
concrete
39. Sometimes worse
patches
round and smooth agg
Water Cement Ratio
transverse cracking
40. Heat and pressure ex- marble - quaertzile
metamorphic
Concrete Construction
Cement compounds
Potable Water
41. Greater =less free water needed to get a given slump
plastic shrinkage
Type I Cement
nominal max aggregate size
paste
42. Source of hotgases - biggest piece of moving equipment
Kiln
Consolidate
longitudinal cracking
nominal max aggregate size
43. Calcareous (calcium) - argillaceous (aluminum) - iron oxide (iron) - gypsum (silicon)
Cement (Portland) ingredients
entrained air
Consolidate
concrete
44. Heavy traffic
Kiln
gypsum
Type I Cement
joint faulting
45. Corner was hotter on top than bottom - it warped and lifted - pressure makes corner crack -
plastic shrinkage
Curing Types
metamorphic
Corner break
46. High Early Strength- fast track projects - we want low set time
well graded mix (med fineness)
Deposit concrete
Type III Cement
paste
47. Ups set time
Consolidate
Concrete Construction
pozzolan
Accelerators Admixture 5
48. Trim subgrade - moisten subgrade - compact (use vibratory roller) - do NOT deposit frozen subgrade or disturb it - uniform - NO water added in front of paver -
entrapped air
Steps to place concrete
Deposit concrete
metamorphic
49. To increase stability of materials - reduce rutting
plastic shrinkage
angular and rough agg
Steps to place concrete
nominal max aggregate size
50. Stratified structure - disintegrated exitisting rocks - inorganice remains of marine animals - ex- limestone
Hydration Contoller Admixture 4
Sedimentary
Type IV Cement
nominal max aggregate size
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