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






2. Early stength at faster rate - for cold temps






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






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






5. Ups set time






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






7. Heavy traffic






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






9. Flowable - nonsegregating






10. Low stability






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






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






13. Heat and pressure ex- marble - quaertzile






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






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






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






17. Bending moment - no shear in middle third






18. Nonpotable/potable >90% - the acceptable






19. Good stability






20. Sometimes worse






21. makes it mushier because cement grains more distributed






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






23. B/c of trucks over time






24. By vibrating - otherwise rock pockets occure -






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






26. For early strength gain






27. To increase stability of materials - reduce rutting






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






29. Moderate Sulfate Resistance- large piers






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






31. High sulfate resistence -






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






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






34. Cement paste has bulk SG< cement particles






35. Cement+course aggregate






36. Distributes cement grains - cement becomes more mushy -






37. From chemicals or excessive drying






38. Trapped air - reduces strength - ups permeabiity






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






40. Stop and reactivate hydration process






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






42. Source of hotgases - biggest piece of moving equipment






43. To improve workability for fresh concrete






44. Water beyond SSD condition






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






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






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






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






49. Ups capilary voids - lowers strength






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