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






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






3. makes it mushier because cement grains more distributed






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






5. Good stability






6. 94 lbs






7. Stop and reactivate hydration process






8. Heavy traffic






9. Source of hotgases - biggest piece of moving equipment






10. To improve workability for fresh concrete






11. Distributes cement grains - cement becomes more mushy -






12. Water beyond SSD condition






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






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






15. B/c of trucks over time






16. Cement+water






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






18. Flowable - nonsegregating






19. Cement paste has bulk SG< cement particles






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






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






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






23. By vibrating - otherwise rock pockets occure -






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






25. From chemicals or excessive drying






26. Bending moment - no shear in middle third






27. Near surface water is cause






28. Moderate Sulfate Resistance- large piers






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






30. Trapped air - reduces strength - ups permeabiity






31. For early strength gain






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






33. Crush clinker into super fine powder






34. Heat and pressure ex- marble - quaertzile






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






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






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






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






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






40. Ups set time






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






42. Early stength at faster rate - for cold temps






43. Low stability






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






45. To increase stability of materials - reduce rutting






46. Sometimes worse






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






48. Nonpotable/potable >90% - the acceptable






49. Normal- for general work






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







Sorry!:) No result found.

Can you answer 50 questions in 15 minutes?


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