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






3. By vibrating - otherwise rock pockets occure -






4. Sometimes worse






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






6. High sulfate resistence -






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






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






9. makes it mushier because cement grains more distributed






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






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






12. 94 lbs






13. Cement+water






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






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






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






17. To increase stability of materials - reduce rutting






18. Water beyond SSD condition






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






20. Source of hotgases - biggest piece of moving equipment






21. Early stength at faster rate - for cold temps






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






23. Heat and pressure ex- marble - quaertzile






24. To improve workability for fresh concrete






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






26. Flowable - nonsegregating






27. From chemicals or excessive drying






28. Cement+sand






29. B/c of trucks over time






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






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






32. Good stability






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






34. Cement paste has bulk SG< cement particles






35. Near surface water is cause






36. Crush clinker into super fine powder






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






38. Moderate Sulfate Resistance- large piers






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






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






41. Ups set time






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






43. Low stability






44. Ups capilary voids - lowers strength






45. Heavy traffic






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






47. Cement+course aggregate






48. Nonpotable/potable >90% - the acceptable






49. For early strength gain






50. Stop and reactivate hydration process