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






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






3. Early stength at faster rate - for cold temps






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






5. Trapped air - reduces strength - ups permeabiity






6. Ups capilary voids - lowers strength






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






8. Moderate Sulfate Resistance- large piers






9. Bending moment - no shear in middle third






10. Water beyond SSD condition






11. Distributes cement grains - cement becomes more mushy -






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






13. Stop and reactivate hydration process






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






15. Crush clinker into super fine powder






16. Nonpotable/potable >90% - the acceptable






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






18. Flowable - nonsegregating






19. For early strength gain






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






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






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






23. To improve workability for fresh concrete






24. By vibrating - otherwise rock pockets occure -






25. 94 lbs






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






27. Ups set time






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






31. B/c of trucks over time






32. makes it mushier because cement grains more distributed






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






34. Normal- for general work






35. Sometimes worse






36. Heat and pressure ex- marble - quaertzile






37. To increase stability of materials - reduce rutting






38. Good stability






39. Cement paste has bulk SG< cement particles






40. Low stability






41. Source of hotgases - biggest piece of moving equipment






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






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






44. Cement+sand






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






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






47. Cement+course aggregate






48. Heavy traffic






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






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