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