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. Trapped air - reduces strength - ups permeabiity






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






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






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






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






6. Normal- for general work






7. High sulfate resistence -






8. To increase stability of materials - reduce rutting






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






10. Cement+course aggregate






11. Ups capilary voids - lowers strength






12. To improve workability for fresh concrete






13. Nonpotable/potable >90% - the acceptable






14. From chemicals or excessive drying






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






16. Crush clinker into super fine powder






17. Sometimes worse






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






19. Near surface water is cause






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






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






22. Cement+water






23. Ups set time






24. For early strength gain






25. Moderate Sulfate Resistance- large piers






26. By vibrating - otherwise rock pockets occure -






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






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






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






30. Cement+sand






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






32. Flowable - nonsegregating






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






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






35. Stop and reactivate hydration process






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






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






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






39. Heavy traffic






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






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






42. 94 lbs






43. Cement paste has bulk SG< cement particles






44. Distributes cement grains - cement becomes more mushy -






45. Good stability






46. B/c of trucks over time






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






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






49. Water beyond SSD condition






50. makes it mushier because cement grains more distributed