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. Cement+sand






2. 94 lbs






3. Ups set time






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






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






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






7. Good stability






8. From chemicals or excessive drying






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






10. Distributes cement grains - cement becomes more mushy -






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






12. Early stength at faster rate - for cold temps






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






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






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






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






17. Heat and pressure ex- marble - quaertzile






18. Cement paste has bulk SG< cement particles






19. To increase stability of materials - reduce rutting






20. Heavy traffic






21. Trapped air - reduces strength - ups permeabiity






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






23. B/c of trucks over time






24. For early strength gain






25. Crush clinker into super fine powder






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






27. Water beyond SSD condition






28. Cement+water






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






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






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






32. High sulfate resistence -






33. makes it mushier because cement grains more distributed






34. Moderate Sulfate Resistance- large piers






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






36. Bending moment - no shear in middle third






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






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






39. Ups capilary voids - lowers strength






40. Sometimes worse






41. Stop and reactivate hydration process






42. To improve workability for fresh concrete






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






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






45. Cement+course aggregate






46. Source of hotgases - biggest piece of moving equipment






47. By vibrating - otherwise rock pockets occure -






48. Normal- for general work






49. Low stability






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