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