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