Test your basic knowledge |

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






2. Trapped air - reduces strength - ups permeabiity






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






4. Cement+water






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






6. By vibrating - otherwise rock pockets occure -






7. Ups capilary voids - lowers strength






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






9. Ups set time






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






11. Water beyond SSD condition






12. Good stability






13. Bending moment - no shear in middle third






14. For early strength gain






15. 94 lbs






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






17. From chemicals or excessive drying






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






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






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






21. B/c of trucks over time






22. Moderate Sulfate Resistance- large piers






23. makes it mushier because cement grains more distributed






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






25. Cement+course aggregate






26. Heat and pressure ex- marble - quaertzile






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






28. To increase stability of materials - reduce rutting






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






30. Early stength at faster rate - for cold temps






31. Normal- for general work






32. Cement paste has bulk SG< cement particles






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






34. Flowable - nonsegregating






35. Crush clinker into super fine powder






36. Source of hotgases - biggest piece of moving equipment






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






38. Stop and reactivate hydration process






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






40. Sometimes worse






41. Cement+sand






42. Heavy traffic






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






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






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






46. Distributes cement grains - cement becomes more mushy -






47. To improve workability for fresh concrete






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






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






50. Low stability