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