Test your basic knowledge |

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. Air bubbles for sapce for water to expand when freezes






2. Trapped air - reduces strength - ups permeabiity






3. Cement+course aggregate






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






5. Cement paste has bulk SG< cement particles






6. Heavy traffic






7. Moderate Sulfate Resistance- large piers






8. For early strength gain






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






10. Nonpotable/potable >90% - the acceptable






11. Heat and pressure ex- marble - quaertzile






12. Bending moment - no shear in middle third






13. Sometimes worse






14. To improve workability for fresh concrete






15. Cement+water






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






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






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






19. From chemicals or excessive drying






20. By vibrating - otherwise rock pockets occure -






21. Good stability






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






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






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






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






26. Low stability






27. 94 lbs






28. Near surface water is cause






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






30. Water beyond SSD condition






31. Crush clinker into super fine powder






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






33. Distributes cement grains - cement becomes more mushy -






34. Flowable - nonsegregating






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






36. Ups capilary voids - lowers strength






37. makes it mushier because cement grains more distributed






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






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






40. B/c of trucks over time






41. Cement+sand






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






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






44. To increase stability of materials - reduce rutting






45. High sulfate resistence -






46. Source of hotgases - biggest piece of moving equipment






47. Stop and reactivate hydration process






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






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






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