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