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