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






3. Trapped air - reduces strength - ups permeabiity






4. To improve workability for fresh concrete






5. Normal- for general work






6. 94 lbs






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






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






9. Sometimes worse






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






11. From chemicals or excessive drying






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






13. Distributes cement grains - cement becomes more mushy -






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






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






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






17. Heat and pressure ex- marble - quaertzile






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






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






20. Early stength at faster rate - for cold temps






21. makes it mushier because cement grains more distributed






22. B/c of trucks over time






23. By vibrating - otherwise rock pockets occure -






24. Crush clinker into super fine powder






25. To increase stability of materials - reduce rutting






26. Ups set time






27. Source of hotgases - biggest piece of moving equipment






28. Cement+course aggregate






29. High sulfate resistence -






30. For early strength gain






31. Cement+water






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






33. Near surface water is cause






34. Heavy traffic






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






36. Low stability






37. Bending moment - no shear in middle third






38. Cement+sand






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






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






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






42. Water beyond SSD condition






43. Good stability






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






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






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






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






48. Stop and reactivate hydration process






49. Cement paste has bulk SG< cement particles






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







Sorry!:) No result found.

Can you answer 50 questions in 15 minutes?


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