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. Stop and reactivate hydration process






2. Flowable - nonsegregating






3. For early strength gain






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






5. B/c of trucks over time






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






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






8. From chemicals or excessive drying






9. Early stength at faster rate - for cold temps






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






11. Ups set time






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






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






14. Moderate Sulfate Resistance- large piers






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






16. Near surface water is cause






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






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






19. By vibrating - otherwise rock pockets occure -






20. Good stability






21. To increase stability of materials - reduce rutting






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






23. Cement+water






24. 94 lbs






25. Normal- for general work






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






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






28. High sulfate resistence -






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






30. Crush clinker into super fine powder






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






32. Nonpotable/potable >90% - the acceptable






33. Source of hotgases - biggest piece of moving equipment






34. Low stability






35. makes it mushier because cement grains more distributed






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






37. Water beyond SSD condition






38. Distributes cement grains - cement becomes more mushy -






39. Cement+course aggregate






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






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






42. Heat and pressure ex- marble - quaertzile






43. Heavy traffic






44. Cement+sand






45. To improve workability for fresh concrete






46. Bending moment - no shear in middle third






47. Trapped air - reduces strength - ups permeabiity






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






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






50. Cement paste has bulk SG< cement particles