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






2. Ups set time






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






4. Cement paste has bulk SG< cement particles






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






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






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






8. Sometimes worse






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






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






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






12. Trapped air - reduces strength - ups permeabiity






13. Heat and pressure ex- marble - quaertzile






14. Cement+water






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






16. Cement+course aggregate






17. makes it mushier because cement grains more distributed






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






19. Heavy traffic






20. Water beyond SSD condition






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






22. Bending moment - no shear in middle third






23. Nonpotable/potable >90% - the acceptable






24. To increase stability of materials - reduce rutting






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






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






27. From chemicals or excessive drying






28. High sulfate resistence -






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






30. Moderate Sulfate Resistance- large piers






31. 94 lbs






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






33. Cement+sand






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






35. Near surface water is cause






36. Crush clinker into super fine powder






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






38. Early stength at faster rate - for cold temps






39. To improve workability for fresh concrete






40. B/c of trucks over time






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






42. Good stability






43. Flowable - nonsegregating






44. By vibrating - otherwise rock pockets occure -






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






46. Stop and reactivate hydration process






47. Normal- for general work






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






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






50. Ups capilary voids - lowers strength