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






2. Cement paste has bulk SG< cement particles






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






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






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






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






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






8. Normal- for general work






9. Crush clinker into super fine powder






10. Heavy traffic






11. To improve workability for fresh concrete






12. Near surface water is cause






13. Ups capilary voids - lowers strength






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






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






16. Water beyond SSD condition






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






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






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






20. Trapped air - reduces strength - ups permeabiity






21. Cement+sand






22. By vibrating - otherwise rock pockets occure -






23. Bending moment - no shear in middle third






24. Early stength at faster rate - for cold temps






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






26. 94 lbs






27. Ups set time






28. Stop and reactivate hydration process






29. Cement+course aggregate






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






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






32. Source of hotgases - biggest piece of moving equipment






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






34. Sometimes worse






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






36. To increase stability of materials - reduce rutting






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






38. Good stability






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






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






41. B/c of trucks over time






42. For early strength gain






43. makes it mushier because cement grains more distributed






44. Moderate Sulfate Resistance- large piers






45. Cement+water






46. Flowable - nonsegregating






47. High sulfate resistence -






48. Low stability






49. Nonpotable/potable >90% - the acceptable






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