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