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Civil Engineering Materials

Subject : engineering
Instructions:
  • Answer 50 questions in 15 minutes.
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  • 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. Calcareous (calcium) - argillaceous (aluminum) - iron oxide (iron) - gypsum (silicon)






2. 94 lbs






3. Ups set time






4. Flowable - nonsegregating






5. Normal- for general work






6. Cement+sand






7. Ups capilary voids - lowers strength






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






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






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






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






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






13. Early stength at faster rate - for cold temps






14. Heavy traffic






15. Good stability






16. Low stability






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






18. Source of hotgases - biggest piece of moving equipment






19. Stop and reactivate hydration process






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






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






22. Trapped air - reduces strength - ups permeabiity






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






24. Sometimes worse






25. Near surface water is cause






26. For early strength gain






27. Bending moment - no shear in middle third






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






29. Moderate Sulfate Resistance- large piers






30. Cement+water






31. B/c of trucks over time






32. Water beyond SSD condition






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






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






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






36. makes it mushier because cement grains more distributed






37. High sulfate resistence -






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






39. Cement+course aggregate






40. From chemicals or excessive drying






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






42. Heat and pressure ex- marble - quaertzile






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






44. To improve workability for fresh concrete






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






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






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






48. Nonpotable/potable >90% - the acceptable






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






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







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