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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. Intentional well distributed air - up durability - adds strength






2. Ups capilary voids - lowers strength






3. From chemicals or excessive drying






4. Ups set time






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






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






7. Stop and reactivate hydration process






8. Trapped air - reduces strength - ups permeabiity






9. Early stength at faster rate - for cold temps






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






11. Cement+sand






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






13. To improve workability for fresh concrete






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






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






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






17. 94 lbs






18. Source of hotgases - biggest piece of moving equipment






19. Flowable - nonsegregating






20. By vibrating - otherwise rock pockets occure -






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






22. Normal- for general work






23. Low stability






24. makes it mushier because cement grains more distributed






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






26. Cement+course aggregate






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






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






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






30. Heat and pressure ex- marble - quaertzile






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






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






33. For early strength gain






34. Nonpotable/potable >90% - the acceptable






35. Good stability






36. Moderate Sulfate Resistance- large piers






37. Cement paste has bulk SG< cement particles






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






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






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






41. Distributes cement grains - cement becomes more mushy -






42. Bending moment - no shear in middle third






43. Sometimes worse






44. To increase stability of materials - reduce rutting






45. Near surface water is cause






46. Cement+water






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






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






49. B/c of trucks over time






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







Sorry!:) No result found.

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