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






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






3. Cement+water






4. Early stength at faster rate - for cold temps






5. Cement paste has bulk SG< cement particles






6. By vibrating - otherwise rock pockets occure -






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






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






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






10. Moderate Sulfate Resistance- large piers






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






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






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






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






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






16. Stop and reactivate hydration process






17. To improve workability for fresh concrete






18. 94 lbs






19. Ups capilary voids - lowers strength






20. Cement+course aggregate






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






22. Ups set time






23. From chemicals or excessive drying






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






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






26. Heat and pressure ex- marble - quaertzile






27. Near surface water is cause






28. Water beyond SSD condition






29. Crush clinker into super fine powder






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






31. Distributes cement grains - cement becomes more mushy -






32. Trapped air - reduces strength - ups permeabiity






33. Cement+sand






34. Heavy traffic






35. Low stability






36. Normal- for general work






37. makes it mushier because cement grains more distributed






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






39. To increase stability of materials - reduce rutting






40. Sometimes worse






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






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






43. Flowable - nonsegregating






44. Source of hotgases - biggest piece of moving equipment






45. Good stability






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






47. B/c of trucks over time






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






49. High sulfate resistence -






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







Sorry!:) No result found.

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