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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. Cement+course aggregate






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






3. For early strength gain






4. Bending moment - no shear in middle third






5. Cement+sand






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






7. Cement+water






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






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






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






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






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






13. By vibrating - otherwise rock pockets occure -






14. Cement paste has bulk SG< cement particles






15. Heat and pressure ex- marble - quaertzile






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






17. B/c of trucks over time






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






19. Ups capilary voids - lowers strength






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






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






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






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






24. 94 lbs






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






26. Source of hotgases - biggest piece of moving equipment






27. Sometimes worse






28. To improve workability for fresh concrete






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






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






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






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






33. makes it mushier because cement grains more distributed






34. Ups set time






35. Water beyond SSD condition






36. Heavy traffic






37. Early stength at faster rate - for cold temps






38. To increase stability of materials - reduce rutting






39. Distributes cement grains - cement becomes more mushy -






40. From chemicals or excessive drying






41. Low stability






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






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






44. Crush clinker into super fine powder






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






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






47. Stop and reactivate hydration process






48. Near surface water is cause






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






50. Trapped air - reduces strength - ups permeabiity







Sorry!:) No result found.

Can you answer 50 questions in 15 minutes?


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