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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. Sometimes worse
Hydration Contoller Admixture 4
patches
Excess water
interlayer hyrdration space
2. Distributes cement grains - cement becomes more mushy -
concrete
water-reducer
longitudinal cracking
entrapped air
3. Good stability
joint faulting
well graded mix (med fineness)
C3S
Cement (Portland) ingredients
4. Volcanic - hardening and crystal molten material ex- granite
Igneous
pozzolan
Retarder Admixutre 3
Concrete Construction
5. For continued hydration and strength gains - otherwise only 50% strength gained - ups durability and abrasion resistance - prevent shrinkage cracking -
Curing
patches
well graded mix (med fineness)
Accelerators Admixture 5
6. Air bubbles for sapce for water to expand when freezes
concrete
round and smooth agg
Air Entrainer Admixture 1
Type II Cement
7. Early stength at faster rate - for cold temps
round and smooth agg
scaling
C3S
Accelerators Admixture 5
8. To improve workability for fresh concrete
slump
free water
round and smooth agg
metamorphic
9. For early strength gain
concrete
Type III Cement
fineness modulus
C3S
10. Normal- for general work
Type I Cement
map cracking
Potable Water
Deposit concrete
11. Trapped air - reduces strength - ups permeabiity
Igneous
paste
entrapped air
Concrete Construction
12. Crush clinker into super fine powder
Type I Cement
ball mill
Kiln
scaling
13. Calcareous (calcium) - argillaceous (aluminum) - iron oxide (iron) - gypsum (silicon)
ball mill
Cement (Portland) ingredients
Deposit concrete
joint faulting
14. Cement+water
fineness modulus
3 point loading flexure test
Cement compounds
paste
15. Slow down rate of aluminate hydration -produces sulfate ions - flash set - false set in excess - higher rate of C-S-H (strength)
water-reducer
gypsum
Water Cement Ratio
Retarder Admixutre 3
16. To increase stability of materials - reduce rutting
Type I Cement
angular and rough agg
Water Cement Ratio
Type V Cement
17. Near surface water is cause
capillary voids
entrained air
map cracking
water bleeding or pumping
18. Stop and reactivate hydration process
Consolidate
concrete
Hydration Contoller Admixture 4
Bag of Cement
19. Cement+sand
capillary voids
pozzolan
mortar
self consolidating concrete SCC
20. B/c of trucks over time
longitudinal cracking
3 point loading flexure test
well graded mix (med fineness)
Type II Cement
21. Heavy traffic
3 point loading flexure test
Water Cement Ratio
joint faulting
Sedimentary
22. Tricalcium silicate (C3S) - dicdalcium silicate (C2S) - tricalcium aluminate (C3A) - tetracalcium aluminoferrite (C4AF)
Type V Cement
mortar
Water Cement Ratio
Cement compounds
23. Low Heat of Hydration- for careful control of heat - dams
Type IV Cement
Cement compounds
concrete
Retarder Admixutre 3
24. High sulfate resistence -
free water
Concrete Construction
Type V Cement
well graded mix (med fineness)
25. High Early Strength- fast track projects - we want low set time
3 point loading flexure test
high fineness
Type III Cement
Bag of Cement
26. Water used for hydration - water beyond SSD - min- .22-.25 - typical- .4-.5 (.44) - lower WC ratio = more strength -
Kiln
Water Cement Ratio
patches
pozzolan
27. Intentional well distributed air - up durability - adds strength
entrained air
Water Cement Ratio
gypsum
C3S
28. Freeze-thaw cycles - bad curing or too much water
scaling
C3S
concrete
Type IV Cement
29. Loss of water from paste (evap) - 1% vol lowers - cracking - prevent by water loss control -
concrete
Cement (Portland) ingredients
plastic shrinkage
Potable Water
30. Low stability
high fineness
Type III Cement
Concrete Construction
slump
31. Consolidation - strike off - depress agg - darby or bull float - (TIME) - edging - jointing - floating - (TIME) - texturing - curing
Concrete Construction
Hydration Contoller Admixture 4
Air Entrainer Admixture 1
Consolidate
32. Do NOT dump in separate piles - deposit in large piles -
entrapped air
Deposit concrete
Type V Cement
Potable Water
33. Flowable - nonsegregating
gypsum
Accelerators Admixture 5
self consolidating concrete SCC
joint faulting
34. Corner was hotter on top than bottom - it warped and lifted - pressure makes corner crack -
Accelerators Admixture 5
joint faulting
Concrete Construction
Corner break
35. Sum of cumul % retained / 100 - higher= bigger particle sizes= smaller amount of agg needed
fineness modulus
Steps to place concrete
entrained air
longitudinal cracking
36. Cement+course aggregate
C3S
interlayer hyrdration space
Cement (Portland) ingredients
concrete
37. Moderate Sulfate Resistance- large piers
Type II Cement
scaling
Consolidate
ball mill
38. max is 12 in - more free water= more slump
Water Cement Ratio
free water
slump
entrapped air
39. Heat and pressure ex- marble - quaertzile
metamorphic
self consolidating concrete SCC
mortar
Type V Cement
40. By vibrating - otherwise rock pockets occure -
Type V Cement
pozzolan
Consolidate
gypsum
41. Space between layers in CSH - water in interparticle space held by hydrogen bonds
joint faulting
water bleeding or pumping
round and smooth agg
interlayer hyrdration space
42. Delay initial set - for long hauls or unusual placement
Retarder Admixutre 3
Potable Water
pozzolan
free water
43. Cement paste has bulk SG< cement particles
plastic shrinkage
Excess water
Type IV Cement
capillary voids
44. Ups capilary voids - lowers strength
Type I Cement
Excess water
longitudinal cracking
Retarder Admixutre 3
45. Greater =less free water needed to get a given slump
water bleeding or pumping
fineness modulus
Retarder Admixutre 3
nominal max aggregate size
46. Ponding/immersion - spraying/fogging - wet coverings -impervious papers/plastic sheets - membrane forming - steam - insulating blankets/covers - electric/hot oil/ infrared -
Water Reducer Admixture 2
map cracking
Type I Cement
Curing Types
47. misplaced joints - more specific- spalling- breaking away of edges
transverse cracking
Hydration Contoller Admixture 4
Concrete Construction
Cement compounds
48. Nonpotable/potable >90% - the acceptable
Potable Water
Type III Cement
ball mill
mortar
49. 94 lbs
concrete
Bag of Cement
Retarder Admixutre 3
paste
50. Source of hotgases - biggest piece of moving equipment
Kiln
Cement compounds
Consolidate
Type III Cement