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. Heat and pressure ex- marble - quaertzile






2. Flowable - nonsegregating






3. Distributes cement grains - cement becomes more mushy -






4. Crush clinker into super fine powder






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






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






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






8. Ups set time






9. Nonpotable/potable >90% - the acceptable






10. Sometimes worse






11. Bending moment - no shear in middle third






12. Good stability






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






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






15. Cement+sand






16. By vibrating - otherwise rock pockets occure -






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






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






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






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






21. To improve workability for fresh concrete






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






23. Near surface water is cause






24. Cement+course aggregate






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






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






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






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






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






30. Source of hotgases - biggest piece of moving equipment






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






32. Stop and reactivate hydration process






33. Cement paste has bulk SG< cement particles






34. B/c of trucks over time






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






36. Early stength at faster rate - for cold temps






37. Ups capilary voids - lowers strength






38. Low stability






39. To increase stability of materials - reduce rutting






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






41. Normal- for general work






42. High sulfate resistence -






43. For early strength gain






44. 94 lbs






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






46. Heavy traffic






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






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






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






50. makes it mushier because cement grains more distributed