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. Ups set time






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






3. Near surface water is cause






4. makes it mushier because cement grains more distributed






5. To improve workability for fresh concrete






6. Heavy traffic






7. Low stability






8. Cement paste has bulk SG< cement particles






9. Cement+course aggregate






10. High sulfate resistence -






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






12. Trapped air - reduces strength - ups permeabiity






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






14. 94 lbs






15. Bending moment - no shear in middle third






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






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






18. Water beyond SSD condition






19. Stop and reactivate hydration process






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






21. By vibrating - otherwise rock pockets occure -






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






23. From chemicals or excessive drying






24. Cement+water






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






26. Good stability






27. Flowable - nonsegregating






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






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






30. Cement+sand






31. Moderate Sulfate Resistance- large piers






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






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






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






35. B/c of trucks over time






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






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






38. Heat and pressure ex- marble - quaertzile






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






40. Ups capilary voids - lowers strength






41. Source of hotgases - biggest piece of moving equipment






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






43. Nonpotable/potable >90% - the acceptable






44. For early strength gain






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






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






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






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






49. Crush clinker into super fine powder






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