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. Air bubbles for sapce for water to expand when freezes






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






3. Good stability






4. Heavy traffic






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






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






7. Crush clinker into super fine powder






8. Distributes cement grains - cement becomes more mushy -






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






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






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






12. Early stength at faster rate - for cold temps






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






14. By vibrating - otherwise rock pockets occure -






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






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






17. To improve workability for fresh concrete






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






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






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






21. Normal- for general work






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






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






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






25. B/c of trucks over time






26. Cement+water






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






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






29. Near surface water is cause






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






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






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






33. Stop and reactivate hydration process






34. Trapped air - reduces strength - ups permeabiity






35. Cement+sand






36. Bending moment - no shear in middle third






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






38. Nonpotable/potable >90% - the acceptable






39. Low stability






40. Sometimes worse






41. Ups capilary voids - lowers strength






42. From chemicals or excessive drying






43. To increase stability of materials - reduce rutting






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






45. Water beyond SSD condition






46. Flowable - nonsegregating






47. Moderate Sulfate Resistance- large piers






48. High sulfate resistence -






49. Cement+course aggregate






50. Ups set time