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. Cement+course aggregate






2. By vibrating - otherwise rock pockets occure -






3. B/c of trucks over time






4. Bending moment - no shear in middle third






5. Trapped air - reduces strength - ups permeabiity






6. Cement+sand






7. Ups capilary voids - lowers strength






8. Crush clinker into super fine powder






9. From chemicals or excessive drying






10. To increase stability of materials - reduce rutting






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






12. Distributes cement grains - cement becomes more mushy -






13. Sometimes worse






14. makes it mushier because cement grains more distributed






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






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






17. Heavy traffic






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






19. Flowable - nonsegregating






20. Stop and reactivate hydration process






21. Moderate Sulfate Resistance- large piers






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






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






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






25. High sulfate resistence -






26. Water beyond SSD condition






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






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






29. 94 lbs






30. Normal- for general work






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






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






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






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






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






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






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






38. Cement+water






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






40. Cement paste has bulk SG< cement particles






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






42. To improve workability for fresh concrete






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






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






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






46. Early stength at faster rate - for cold temps






47. Ups set time






48. Nonpotable/potable >90% - the acceptable






49. For early strength gain






50. Near surface water is cause