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






2. B/c of trucks over time






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






4. Cement paste has bulk SG< cement particles






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






6. Nonpotable/potable >90% - the acceptable






7. Heat and pressure ex- marble - quaertzile






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






9. Bending moment - no shear in middle third






10. Sometimes worse






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






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






13. Cement+water






14. From chemicals or excessive drying






15. Ups set time






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






17. Flowable - nonsegregating






18. To improve workability for fresh concrete






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






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






21. High sulfate resistence -






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






23. Trapped air - reduces strength - ups permeabiity






24. makes it mushier because cement grains more distributed






25. Moderate Sulfate Resistance- large piers






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






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






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






29. Cement+sand






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






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






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






33. Near surface water is cause






34. Water beyond SSD condition






35. Normal- for general work






36. Early stength at faster rate - for cold temps






37. Crush clinker into super fine powder






38. By vibrating - otherwise rock pockets occure -






39. Good stability






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






41. Source of hotgases - biggest piece of moving equipment






42. Stop and reactivate hydration process






43. To increase stability of materials - reduce rutting






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






45. Distributes cement grains - cement becomes more mushy -






46. Cement+course aggregate






47. Ups capilary voids - lowers strength






48. Heavy traffic






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






50. For early strength gain







Sorry!:) No result found.

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