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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. Low stability






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






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






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. For early strength gain






6. Sometimes worse






7. Cement paste has bulk SG< cement particles






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






9. Cement+sand






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






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






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






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






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






15. Ups capilary voids - lowers strength






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






17. To improve workability for fresh concrete






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






19. To increase stability of materials - reduce rutting






20. Water beyond SSD condition






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






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






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






24. Bending moment - no shear in middle third






25. Heavy traffic






26. Source of hotgases - biggest piece of moving equipment






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






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






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






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






31. Nonpotable/potable >90% - the acceptable






32. From chemicals or excessive drying






33. 94 lbs






34. Cement+course aggregate






35. Moderate Sulfate Resistance- large piers






36. Crush clinker into super fine powder






37. By vibrating - otherwise rock pockets occure -






38. High sulfate resistence -






39. Ups set time






40. Flowable - nonsegregating






41. Cement+water






42. Distributes cement grains - cement becomes more mushy -






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






44. Trapped air - reduces strength - ups permeabiity






45. Near surface water is cause






46. Early stength at faster rate - for cold temps






47. Heat and pressure ex- marble - quaertzile






48. B/c of trucks over time






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






50. Good stability






?:?:)

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