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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. Volcanic - hardening and crystal molten material ex- granite






2. To improve workability for fresh concrete






3. Water beyond SSD condition






4. Flowable - nonsegregating






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






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






7. Cement+course aggregate






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






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






10. Heavy traffic






11. Cement+water






12. Source of hotgases - biggest piece of moving equipment






13. misplaced joints - more specific- spalling- breaking away of edges






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






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






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






17. By vibrating - otherwise rock pockets occure -






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






19. From chemicals or excessive drying






20. Trapped air - reduces strength - ups permeabiity






21. Distributes cement grains - cement becomes more mushy -






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






23. 94 lbs






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






25. Early stength at faster rate - for cold temps






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






27. Near surface water is cause






28. Low stability






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






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






31. For early strength gain






32. makes it mushier because cement grains more distributed






33. Ups set time






34. Stop and reactivate hydration process






35. To increase stability of materials - reduce rutting






36. B/c of trucks over time






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






38. Air bubbles for sapce for water to expand when freezes






39. High sulfate resistence -






40. Cement paste has bulk SG< cement particles






41. Moderate Sulfate Resistance- large piers






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






43. Normal- for general work






44. Bending moment - no shear in middle third






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






46. Good stability






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






48. Nonpotable/potable >90% - the acceptable






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






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







Sorry!:) No result found.

Can you answer 50 questions in 15 minutes?


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