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. Volcanic - hardening and crystal molten material ex- granite






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






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






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






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






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






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






8. From chemicals or excessive drying






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






10. Trapped air - reduces strength - ups permeabiity






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






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






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






14. Heavy traffic






15. Ups capilary voids - lowers strength






16. To improve workability for fresh concrete






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






18. B/c of trucks over time






19. Stop and reactivate hydration process






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






21. Sometimes worse






22. Cement+water






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






24. makes it mushier because cement grains more distributed






25. Moderate Sulfate Resistance- large piers






26. Cement paste has bulk SG< cement particles






27. Heat and pressure ex- marble - quaertzile






28. Ups set time






29. High sulfate resistence -






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






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






32. Early stength at faster rate - for cold temps






33. Good stability






34. Cement+course aggregate






35. Low stability






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






37. Near surface water is cause






38. Nonpotable/potable >90% - the acceptable






39. Crush clinker into super fine powder






40. 94 lbs






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






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






43. To increase stability of materials - reduce rutting






44. Cement+sand






45. Distributes cement grains - cement becomes more mushy -






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






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






48. For early strength gain






49. Bending moment - no shear in middle third






50. Water beyond SSD condition