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. Good stability






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






3. Normal- for general work






4. Source of hotgases - biggest piece of moving equipment






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






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






7. To improve workability for fresh concrete






8. Cement+course aggregate






9. Trapped air - reduces strength - ups permeabiity






10. Heavy traffic






11. Near surface water is cause






12. Nonpotable/potable >90% - the acceptable






13. B/c of trucks over time






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






15. To increase stability of materials - reduce rutting






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






17. Moderate Sulfate Resistance- large piers






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






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






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






21. Sometimes worse






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






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






24. Low stability






25. Bending moment - no shear in middle third






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






27. From chemicals or excessive drying






28. By vibrating - otherwise rock pockets occure -






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






30. Early stength at faster rate - for cold temps






31. Flowable - nonsegregating






32. makes it mushier because cement grains more distributed






33. Cement+sand






34. Heat and pressure ex- marble - quaertzile






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






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






37. For early strength gain






38. Cement paste has bulk SG< cement particles






39. Distributes cement grains - cement becomes more mushy -






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






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






42. Ups set time






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






44. Ups capilary voids - lowers strength






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






46. High sulfate resistence -






47. Stop and reactivate hydration process






48. Water beyond SSD condition






49. Cement+water






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