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Civil Engineering Materials

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. Ponding/immersion - spraying/fogging - wet coverings -impervious papers/plastic sheets - membrane forming - steam - insulating blankets/covers - electric/hot oil/ infrared -






2. Cement+water






3. Delay initial set - for long hauls or unusual placement






4. Source of hotgases - biggest piece of moving equipment






5. Freeze-thaw cycles - bad curing or too much water






6. For early strength gain






7. Volcanic - hardening and crystal molten material ex- granite






8. Trapped air - reduces strength - ups permeabiity






9. Early stength at faster rate - for cold temps






10. Stratified structure - disintegrated exitisting rocks - inorganice remains of marine animals - ex- limestone






11. Water used for hydration - water beyond SSD - min- .22-.25 - typical- .4-.5 (.44) - lower WC ratio = more strength -






12. From chemicals or excessive drying






13. Cement paste has bulk SG< cement particles






14. Flowable - nonsegregating






15. Tricalcium silicate (C3S) - dicdalcium silicate (C2S) - tricalcium aluminate (C3A) - tetracalcium aluminoferrite (C4AF)






16. Calcareous (calcium) - argillaceous (aluminum) - iron oxide (iron) - gypsum (silicon)






17. To improve workability for fresh concrete






18. Near surface water is cause






19. Consolidation - strike off - depress agg - darby or bull float - (TIME) - edging - jointing - floating - (TIME) - texturing - curing






20. Moderate Sulfate Resistance- large piers






21. Low Heat of Hydration- for careful control of heat - dams






22. Slow down rate of aluminate hydration -produces sulfate ions - flash set - false set in excess - higher rate of C-S-H (strength)






23. Heat and pressure ex- marble - quaertzile






24. Space between layers in CSH - water in interparticle space held by hydrogen bonds






25. Bending moment - no shear in middle third






26. Do NOT dump in separate piles - deposit in large piles -






27. High Early Strength- fast track projects - we want low set time






28. Distributes cement grains - cement becomes more mushy -






29. Cement+sand






30. B/c of trucks over time






31. Loss of water from paste (evap) - 1% vol lowers - cracking - prevent by water loss control -






32. Ups capilary voids - lowers strength






33. High sulfate resistence -






34. Sometimes worse






35. max is 12 in - more free water= more slump






36. Cement+course aggregate






37. Heavy traffic






38. Sum of cumul % retained / 100 - higher= bigger particle sizes= smaller amount of agg needed






39. Greater =less free water needed to get a given slump






40. To increase stability of materials - reduce rutting






41. Intentional well distributed air - up durability - adds strength






42. makes it mushier because cement grains more distributed






43. Normal- for general work






44. For continued hydration and strength gains - otherwise only 50% strength gained - ups durability and abrasion resistance - prevent shrinkage cracking -






45. Trim subgrade - moisten subgrade - compact (use vibratory roller) - do NOT deposit frozen subgrade or disturb it - uniform - NO water added in front of paver -






46. Stop and reactivate hydration process






47. 94 lbs






48. Good stability






49. Corner was hotter on top than bottom - it warped and lifted - pressure makes corner crack -






50. Crush clinker into super fine powder







Sorry!:) No result found.

Can you answer 50 questions in 15 minutes?


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