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. Low stability






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






3. Cement paste has bulk SG< cement particles






4. Flowable - nonsegregating






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






6. Ups capilary voids - lowers strength






7. Water beyond SSD condition






8. Crush clinker into super fine powder






9. To improve workability for fresh concrete






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






11. Source of hotgases - biggest piece of moving equipment






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






13. Cement+sand






14. Bending moment - no shear in middle third






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






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






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






18. Moderate Sulfate Resistance- large piers






19. By vibrating - otherwise rock pockets occure -






20. From chemicals or excessive drying






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






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






23. High sulfate resistence -






24. B/c of trucks over time






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






26. 94 lbs






27. makes it mushier because cement grains more distributed






28. Normal- for general work






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






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






31. For early strength gain






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






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






34. Distributes cement grains - cement becomes more mushy -






35. Stop and reactivate hydration process






36. Ups set time






37. Heat and pressure ex- marble - quaertzile






38. Cement+course aggregate






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






40. Nonpotable/potable >90% - the acceptable






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






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






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






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






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






46. Heavy traffic






47. Cement+water






48. Near surface water is cause






49. To increase stability of materials - reduce rutting






50. Trapped air - reduces strength - ups permeabiity