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. makes it mushier because cement grains more distributed






2. Water beyond SSD condition






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






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






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






6. Nonpotable/potable >90% - the acceptable






7. Ups set time






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






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






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






11. High sulfate resistence -






12. Stop and reactivate hydration process






13. Bending moment - no shear in middle third






14. Cement+course aggregate






15. 94 lbs






16. Source of hotgases - biggest piece of moving equipment






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






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






19. Ups capilary voids - lowers strength






20. Sometimes worse






21. Distributes cement grains - cement becomes more mushy -






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






23. By vibrating - otherwise rock pockets occure -






24. Good stability






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






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






27. Moderate Sulfate Resistance- large piers






28. Cement+water






29. Early stength at faster rate - for cold temps






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






31. Crush clinker into super fine powder






32. Heavy traffic






33. Near surface water is cause






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






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






36. From chemicals or excessive drying






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






38. Flowable - nonsegregating






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






40. To increase stability of materials - reduce rutting






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






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






43. Trapped air - reduces strength - ups permeabiity






44. Heat and pressure ex- marble - quaertzile






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






46. Low stability






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






48. B/c of trucks over time






49. To improve workability for fresh concrete






50. Normal- for general work