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






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






3. To increase stability of materials - reduce rutting






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






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






6. Distributes cement grains - cement becomes more mushy -






7. Near surface water is cause






8. Cement+course aggregate






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






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






11. Crush clinker into super fine powder






12. Source of hotgases - biggest piece of moving equipment






13. Good stability






14. Ups set time






15. Cement paste has bulk SG< cement particles






16. Low stability






17. Cement+water






18. Ups capilary voids - lowers strength






19. makes it mushier because cement grains more distributed






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






21. Heat and pressure ex- marble - quaertzile






22. Sometimes worse






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






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






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






26. Normal- for general work






27. Cement+sand






28. Bending moment - no shear in middle third






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






30. 94 lbs






31. Trapped air - reduces strength - ups permeabiity






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






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






34. Heavy traffic






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






36. Stop and reactivate hydration process






37. Water beyond SSD condition






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






39. From chemicals or excessive drying






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






41. Nonpotable/potable >90% - the acceptable






42. B/c of trucks over time






43. Flowable - nonsegregating






44. For early strength gain






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






46. High sulfate resistence -






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






48. Early stength at faster rate - for cold temps






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






50. To improve workability for fresh concrete