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. Heavy traffic






3. By vibrating - otherwise rock pockets occure -






4. Cement+water






5. makes it mushier because cement grains more distributed






6. Ups capilary voids - lowers strength






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






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






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






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






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






12. Stop and reactivate hydration process






13. For early strength gain






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






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






16. Source of hotgases - biggest piece of moving equipment






17. Low stability






18. Cement+sand






19. Distributes cement grains - cement becomes more mushy -






20. Water beyond SSD condition






21. Trapped air - reduces strength - ups permeabiity






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






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






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






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






26. High sulfate resistence -






27. To increase stability of materials - reduce rutting






28. Cement paste has bulk SG< cement particles






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






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






31. Early stength at faster rate - for cold temps






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






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






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






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






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






37. Good stability






38. Ups set time






39. To improve workability for fresh concrete






40. From chemicals or excessive drying






41. Heat and pressure ex- marble - quaertzile






42. Flowable - nonsegregating






43. Bending moment - no shear in middle third






44. Near surface water is cause






45. Moderate Sulfate Resistance- large piers






46. Normal- for general work






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






48. Sometimes worse






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






50. Cement+course aggregate