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






2. Distributes cement grains - cement becomes more mushy -






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






4. Crush clinker into super fine powder






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






6. Trapped air - reduces strength - ups permeabiity






7. Stop and reactivate hydration process






8. Bending moment - no shear in middle third






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






10. Near surface water is cause






11. Nonpotable/potable >90% - the acceptable






12. Normal- for general work






13. makes it mushier because cement grains more distributed






14. For early strength gain






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






16. B/c of trucks over time






17. Early stength at faster rate - for cold temps






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






19. By vibrating - otherwise rock pockets occure -






20. 94 lbs






21. Cement paste has bulk SG< cement particles






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






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






24. From chemicals or excessive drying






25. Cement+course aggregate






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






27. Heat and pressure ex- marble - quaertzile






28. To improve workability for fresh concrete






29. Flowable - nonsegregating






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






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






32. Cement+water






33. High sulfate resistence -






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






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






36. Heavy traffic






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






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






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






40. Source of hotgases - biggest piece of moving equipment






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






42. Low stability






43. Good stability






44. Cement+sand






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






46. To increase stability of materials - reduce rutting






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






48. Water beyond SSD condition






49. Moderate Sulfate Resistance- large piers






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