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






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






4. To improve workability for fresh concrete






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






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






7. Cement paste has bulk SG< cement particles






8. Near surface water is cause






9. Ups capilary voids - lowers strength






10. Normal- for general work






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






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






13. B/c of trucks over time






14. Low stability






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






16. Cement+sand






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






18. Nonpotable/potable >90% - the acceptable






19. makes it mushier because cement grains more distributed






20. To increase stability of materials - reduce rutting






21. By vibrating - otherwise rock pockets occure -






22. Trapped air - reduces strength - ups permeabiity






23. For early strength gain






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






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






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






27. Ups set time






28. Source of hotgases - biggest piece of moving equipment






29. Sometimes worse






30. Heat and pressure ex- marble - quaertzile






31. Flowable - nonsegregating






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






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






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






35. From chemicals or excessive drying






36. Stop and reactivate hydration process






37. Moderate Sulfate Resistance- large piers






38. Distributes cement grains - cement becomes more mushy -






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






40. Crush clinker into super fine powder






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






42. Early stength at faster rate - for cold temps






43. 94 lbs






44. Water beyond SSD condition






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






46. Good stability






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






48. High sulfate resistence -






49. Bending moment - no shear in middle third






50. Cement+course aggregate