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. Distributes cement grains - cement becomes more mushy -






2. By vibrating - otherwise rock pockets occure -






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






4. Ups set time






5. Cement paste has bulk SG< cement particles






6. To increase stability of materials - reduce rutting






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






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






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






10. Sometimes worse






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






12. From chemicals or excessive drying






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






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






15. Nonpotable/potable >90% - the acceptable






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






17. Near surface water is cause






18. B/c of trucks over time






19. Heat and pressure ex- marble - quaertzile






20. High sulfate resistence -






21. Crush clinker into super fine powder






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






23. Source of hotgases - biggest piece of moving equipment






24. Heavy traffic






25. Stop and reactivate hydration process






26. Cement+course aggregate






27. For early strength gain






28. Cement+water






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






30. Good stability






31. Early stength at faster rate - for cold temps






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






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






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






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






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






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






38. Bending moment - no shear in middle third






39. Water beyond SSD condition






40. Low stability






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






42. makes it mushier because cement grains more distributed






43. Cement+sand






44. Normal- for general work






45. Ups capilary voids - lowers strength






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






47. Trapped air - reduces strength - ups permeabiity






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






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






50. To improve workability for fresh concrete