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






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






3. From chemicals or excessive drying






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






5. Normal- for general work






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






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






8. Cement paste has bulk SG< cement particles






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






10. Cement+sand






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






12. Crush clinker into super fine powder






13. Trapped air - reduces strength - ups permeabiity






14. Nonpotable/potable >90% - the acceptable






15. Cement+water






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






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






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






19. makes it mushier because cement grains more distributed






20. Flowable - nonsegregating






21. Moderate Sulfate Resistance- large piers






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






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






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






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






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






27. Stop and reactivate hydration process






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






29. B/c of trucks over time






30. High sulfate resistence -






31. Ups capilary voids - lowers strength






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






33. Source of hotgases - biggest piece of moving equipment






34. 94 lbs






35. Water beyond SSD condition






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






37. To improve workability for fresh concrete






38. Distributes cement grains - cement becomes more mushy -






39. Ups set time






40. Sometimes worse






41. Heavy traffic






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






43. Near surface water is cause






44. To increase stability of materials - reduce rutting






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






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






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






48. For early strength gain






49. Low stability






50. Heat and pressure ex- marble - quaertzile