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. To increase stability of materials - reduce rutting






2. Crush clinker into super fine powder






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






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






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






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






7. Water beyond SSD condition






8. Near surface water is cause






9. By vibrating - otherwise rock pockets occure -






10. Distributes cement grains - cement becomes more mushy -






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






12. Source of hotgases - biggest piece of moving equipment






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






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






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






16. Cement+water






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






18. To improve workability for fresh concrete






19. For early strength gain






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






21. Early stength at faster rate - for cold temps






22. Sometimes worse






23. High sulfate resistence -






24. Ups capilary voids - lowers strength






25. B/c of trucks over time






26. Heat and pressure ex- marble - quaertzile






27. Cement paste has bulk SG< cement particles






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






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






30. Nonpotable/potable >90% - the acceptable






31. Bending moment - no shear in middle third






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






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






34. Moderate Sulfate Resistance- large piers






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






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






37. Normal- for general work






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






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






40. Good stability






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






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






43. Cement+sand






44. Ups set time






45. Heavy traffic






46. Flowable - nonsegregating






47. From chemicals or excessive drying






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






49. Low stability






50. 94 lbs