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