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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. Bending moment - no shear in middle third






3. Low stability






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






5. Source of hotgases - biggest piece of moving equipment






6. Ups capilary voids - lowers strength






7. B/c of trucks over time






8. Cement paste has bulk SG< cement particles






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






10. Water beyond SSD condition






11. Nonpotable/potable >90% - the acceptable






12. Stop and reactivate hydration process






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






14. Normal- for general work






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






16. Heat and pressure ex- marble - quaertzile






17. makes it mushier because cement grains more distributed






18. High sulfate resistence -






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






20. Flowable - nonsegregating






21. Near surface water is cause






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






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






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






25. Ups set time






26. From chemicals or excessive drying






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






28. Sometimes worse






29. Cement+course aggregate






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






31. Distributes cement grains - cement becomes more mushy -






32. Early stength at faster rate - for cold temps






33. By vibrating - otherwise rock pockets occure -






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






35. To improve workability for fresh concrete






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






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






38. Good stability






39. To increase stability of materials - reduce rutting






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






41. Trapped air - reduces strength - ups permeabiity






42. 94 lbs






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






44. Moderate Sulfate Resistance- large piers






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






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






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






48. Heavy traffic






49. Cement+water






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







Sorry!:) No result found.

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