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. Stop and reactivate hydration process






2. makes it mushier because cement grains more distributed






3. To improve workability for fresh concrete






4. Water beyond SSD condition






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






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






7. Near surface water is cause






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






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






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






12. Good stability






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






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






15. Cement+water






16. Cement+sand






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






18. Early stength at faster rate - for cold temps






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






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






21. From chemicals or excessive drying






22. High sulfate resistence -






23. Moderate Sulfate Resistance- large piers






24. Crush clinker into super fine powder






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






26. Flowable - nonsegregating






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






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






29. Source of hotgases - biggest piece of moving equipment






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






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






32. For early strength gain






33. Low stability






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






35. Ups set time






36. Normal- for general work






37. Heavy traffic






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






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






40. B/c of trucks over time






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






42. Cement+course aggregate






43. Cement paste has bulk SG< cement particles






44. Bending moment - no shear in middle third






45. 94 lbs






46. To increase stability of materials - reduce rutting






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






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






49. Trapped air - reduces strength - ups permeabiity






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