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






2. Ups set time






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






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






5. To increase stability of materials - reduce rutting






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






7. Crush clinker into super fine powder






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






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






10. Sometimes worse






11. Normal- for general work






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






13. Ups capilary voids - lowers strength






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






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






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






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






18. From chemicals or excessive drying






19. makes it mushier because cement grains more distributed






20. For early strength gain






21. Distributes cement grains - cement becomes more mushy -






22. 94 lbs






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






24. Cement+sand






25. Low stability






26. Cement+course aggregate






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






28. High sulfate resistence -






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






30. Heat and pressure ex- marble - quaertzile






31. Cement paste has bulk SG< cement particles






32. Source of hotgases - biggest piece of moving equipment






33. Early stength at faster rate - for cold temps






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






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






36. Flowable - nonsegregating






37. By vibrating - otherwise rock pockets occure -






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






39. Trapped air - reduces strength - ups permeabiity






40. Nonpotable/potable >90% - the acceptable






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






42. B/c of trucks over time






43. Near surface water is cause






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






45. Moderate Sulfate Resistance- large piers






46. Stop and reactivate hydration process






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






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






49. Good stability






50. Heavy traffic