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. Nonpotable/potable >90% - the acceptable






2. 94 lbs






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






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






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






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






7. By vibrating - otherwise rock pockets occure -






8. Ups capilary voids - lowers strength






9. Distributes cement grains - cement becomes more mushy -






10. Source of hotgases - biggest piece of moving equipment






11. Cement+course aggregate






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






13. Good stability






14. Cement+water






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






16. B/c of trucks over time






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






18. Stop and reactivate hydration process






19. Heavy traffic






20. Normal- for general work






21. makes it mushier because cement grains more distributed






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






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






24. High sulfate resistence -






25. To improve workability for fresh concrete






26. Trapped air - reduces strength - ups permeabiity






27. Ups set time






28. From chemicals or excessive drying






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






30. Crush clinker into super fine powder






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






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






33. Near surface water is cause






34. Heat and pressure ex- marble - quaertzile






35. Sometimes worse






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






37. Low stability






38. For early strength gain






39. Bending moment - no shear in middle third






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






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






42. Early stength at faster rate - for cold temps






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






44. Cement paste has bulk SG< cement particles






45. Water beyond SSD condition






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






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






48. To increase stability of materials - reduce rutting






49. Flowable - nonsegregating






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