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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. Nonpotable/potable >90% - the acceptable






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






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






4. Good stability






5. Heat and pressure ex- marble - quaertzile






6. makes it mushier because cement grains more distributed






7. Low stability






8. Bending moment - no shear in middle third






9. Crush clinker into super fine powder






10. Near surface water is cause






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






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






13. Cement paste has bulk SG< cement particles






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






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






16. High sulfate resistence -






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






18. To increase stability of materials - reduce rutting






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






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






21. From chemicals or excessive drying






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






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






24. Cement+sand






25. To improve workability for fresh concrete






26. Ups set time






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






28. Flowable - nonsegregating






29. Sometimes worse






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






31. Distributes cement grains - cement becomes more mushy -






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






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






34. Water beyond SSD condition






35. By vibrating - otherwise rock pockets occure -






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






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






38. Stop and reactivate hydration process






39. For early strength gain






40. B/c of trucks over time






41. Normal- for general work






42. Cement+water






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






44. Trapped air - reduces strength - ups permeabiity






45. Cement+course aggregate






46. Early stength at faster rate - for cold temps






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






48. Ups capilary voids - lowers strength






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






50. Heavy traffic







Sorry!:) No result found.

Can you answer 50 questions in 15 minutes?


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