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