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. Cement+sand






2. For early strength gain






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






4. Stop and reactivate hydration process






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






6. Source of hotgases - biggest piece of moving equipment






7. Nonpotable/potable >90% - the acceptable






8. High sulfate resistence -






9. 94 lbs






10. Distributes cement grains - cement becomes more mushy -






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






12. Crush clinker into super fine powder






13. makes it mushier because cement grains more distributed






14. Cement+course aggregate






15. Flowable - nonsegregating






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






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






18. Near surface water is cause






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






20. Cement+water






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






22. To increase stability of materials - reduce rutting






23. Trapped air - reduces strength - ups permeabiity






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






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






26. Good stability






27. Bending moment - no shear in middle third






28. Normal- for general work






29. Early stength at faster rate - for cold temps






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






31. From chemicals or excessive drying






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






33. Cement paste has bulk SG< cement particles






34. By vibrating - otherwise rock pockets occure -






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






36. Water beyond SSD condition






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






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






39. Heat and pressure ex- marble - quaertzile






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






41. Ups set time






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






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






44. Ups capilary voids - lowers strength






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






46. Sometimes worse






47. Low stability






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






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






50. Moderate Sulfate Resistance- large piers