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. Good stability






3. Low stability






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






5. To improve workability for fresh concrete






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






7. Cement+course aggregate






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






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






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






11. Sometimes worse






12. makes it mushier because cement grains more distributed






13. Cement+sand






14. By vibrating - otherwise rock pockets occure -






15. To increase stability of materials - reduce rutting






16. Source of hotgases - biggest piece of moving equipment






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






18. 94 lbs






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






20. Bending moment - no shear in middle third






21. Flowable - nonsegregating






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






23. Cement paste has bulk SG< cement particles






24. Heavy traffic






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






26. B/c of trucks over time






27. Ups capilary voids - lowers strength






28. Nonpotable/potable >90% - the acceptable






29. Crush clinker into super fine powder






30. Moderate Sulfate Resistance- large piers






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






32. Distributes cement grains - cement becomes more mushy -






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






34. Cement+water






35. Early stength at faster rate - for cold temps






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






37. Heat and pressure ex- marble - quaertzile






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






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






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






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






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






43. Water beyond SSD condition






44. Trapped air - reduces strength - ups permeabiity






45. High sulfate resistence -






46. Near surface water is cause






47. Normal- for general work






48. For early strength gain






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






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