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