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. Cement+course aggregate






3. High sulfate resistence -






4. Water beyond SSD condition






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






6. From chemicals or excessive drying






7. Distributes cement grains - cement becomes more mushy -






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






9. B/c of trucks over time






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






11. Moderate Sulfate Resistance- large piers






12. By vibrating - otherwise rock pockets occure -






13. Good stability






14. Near surface water is cause






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






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






17. Nonpotable/potable >90% - the acceptable






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






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






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






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






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






23. Source of hotgases - biggest piece of moving equipment






24. Low stability






25. Heavy traffic






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






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






28. Ups capilary voids - lowers strength






29. 94 lbs






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






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






32. Crush clinker into super fine powder






33. Stop and reactivate hydration process






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






35. To improve workability for fresh concrete






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






37. Flowable - nonsegregating






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






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






40. Bending moment - no shear in middle third






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






42. Cement+water






43. To increase stability of materials - reduce rutting






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






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






46. Cement paste has bulk SG< cement particles






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






48. Cement+sand






49. Early stength at faster rate - for cold temps






50. Ups set time