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