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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. Heavy traffic






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






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






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






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






6. Nonpotable/potable >90% - the acceptable






7. Source of hotgases - biggest piece of moving equipment






8. Water beyond SSD condition






9. Ups capilary voids - lowers strength






10. Good stability






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






12. Cement paste has bulk SG< cement particles






13. Ups set time






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






15. Cement+water






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






17. Trapped air - reduces strength - ups permeabiity






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






19. makes it mushier because cement grains more distributed






20. B/c of trucks over time






21. From chemicals or excessive drying






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






23. Cement+course aggregate






24. Near surface water is cause






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






26. For early strength gain






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






28. Moderate Sulfate Resistance- large piers






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






30. Sometimes worse






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






32. Cement+sand






33. Low stability






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






35. To increase stability of materials - reduce rutting






36. Distributes cement grains - cement becomes more mushy -






37. Flowable - nonsegregating






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






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






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






41. To improve workability for fresh concrete






42. By vibrating - otherwise rock pockets occure -






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






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






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






46. Stop and reactivate hydration process






47. Bending moment - no shear in middle third






48. Crush clinker into super fine powder






49. 94 lbs






50. Early stength at faster rate - for cold temps







Sorry!:) No result found.

Can you answer 50 questions in 15 minutes?


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