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