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