Test your basic knowledge |

Civil Engineering Materials

Subject : engineering
Instructions:
  • Answer 50 questions in 20 minutes. 2 minutes extra for reading the instructions.
  • 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. Calcareous (calcium) - argillaceous (aluminum) - iron oxide (iron) - gypsum (silicon)






2. Moderate Sulfate Resistance- large piers






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






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






5. High sulfate resistence -






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






7. Flowable - nonsegregating






8. Cement+course aggregate






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






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






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






12. Nonpotable/potable >90% - the acceptable






13. Source of hotgases - biggest piece of moving equipment






14. Low stability






15. Near surface water is cause






16. Good stability






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






18. By vibrating - otherwise rock pockets occure -






19. makes it mushier because cement grains more distributed






20. To improve workability for fresh concrete






21. Stop and reactivate hydration process






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






23. Sometimes worse






24. Bending moment - no shear in middle third






25. Trapped air - reduces strength - ups permeabiity






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






27. From chemicals or excessive drying






28. Ups capilary voids - lowers strength






29. Cement paste has bulk SG< cement particles






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






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






32. 94 lbs






33. Heavy traffic






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






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






36. B/c of trucks over time






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 -






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






39. Normal- for general work






40. Water beyond SSD condition






41. Crush clinker into super fine powder






42. To increase stability of materials - reduce rutting






43. Distributes cement grains - cement becomes more mushy -






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






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






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






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






48. Ups set time






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






50. Cement+water