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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. B/c of trucks over time






2. To increase stability of materials - reduce rutting






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






4. Moderate Sulfate Resistance- large piers






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






6. Ups set time






7. Trapped air - reduces strength - ups permeabiity






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






9. Heat and pressure ex- marble - quaertzile






10. To improve workability for fresh concrete






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






12. Flowable - nonsegregating






13. From chemicals or excessive drying






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






15. For early strength gain






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






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






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






19. Stop and reactivate hydration process






20. Cement+course aggregate






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






22. Heavy traffic






23. Cement+sand






24. Cement paste has bulk SG< cement particles






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






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






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






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






29. makes it mushier because cement grains more distributed






30. By vibrating - otherwise rock pockets occure -






31. Nonpotable/potable >90% - the acceptable






32. Early stength at faster rate - for cold temps






33. Ups capilary voids - lowers strength






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






35. Water beyond SSD condition






36. Near surface water is cause






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






38. Low stability






39. Good stability






40. 94 lbs






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






42. High sulfate resistence -






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






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






45. Source of hotgases - biggest piece of moving equipment






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






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






48. Normal- for general work






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






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







Sorry!:) No result found.

Can you answer 50 questions in 15 minutes?


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