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. From chemicals or excessive drying






2. Good stability






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






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






5. Cement paste has bulk SG< cement particles






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






7. Stop and reactivate hydration process






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






9. Trapped air - reduces strength - ups permeabiity






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






11. Cement+water






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






13. Ups capilary voids - lowers strength






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






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






16. Cement+sand






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






18. Bending moment - no shear in middle third






19. makes it mushier because cement grains more distributed






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






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






22. Source of hotgases - biggest piece of moving equipment






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






24. Water beyond SSD condition






25. Ups set time






26. High sulfate resistence -






27. Near surface water is cause






28. Distributes cement grains - cement becomes more mushy -






29. To increase stability of materials - reduce rutting






30. Flowable - nonsegregating






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






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






33. Heat and pressure ex- marble - quaertzile






34. To improve workability for fresh concrete






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






36. For early strength gain






37. Heavy traffic






38. 94 lbs






39. Sometimes worse






40. B/c of trucks over time






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






42. Moderate Sulfate Resistance- large piers






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






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






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






46. Cement+course aggregate






47. Low stability






48. Normal- for general work






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






50. Nonpotable/potable >90% - the acceptable