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. Delay initial set - for long hauls or unusual placement






2. Low stability






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






4. From chemicals or excessive drying






5. Normal- for general work






6. Heat and pressure ex- marble - quaertzile






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






8. Cement+water






9. Flowable - nonsegregating






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






11. Trapped air - reduces strength - ups permeabiity






12. Ups set time






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






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






15. Near surface water is cause






16. Nonpotable/potable >90% - the acceptable






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






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






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






20. Crush clinker into super fine powder






21. Cement+course aggregate






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






23. Good stability






24. Bending moment - no shear in middle third






25. By vibrating - otherwise rock pockets occure -






26. Cement paste has bulk SG< cement particles






27. B/c of trucks over time






28. To increase stability of materials - reduce rutting






29. Early stength at faster rate - for cold temps






30. Sometimes worse






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






32. Heavy traffic






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






34. To improve workability for fresh concrete






35. Stop and reactivate hydration process






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






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






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






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






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






41. Cement+sand






42. makes it mushier because cement grains more distributed






43. Moderate Sulfate Resistance- large piers






44. Water beyond SSD condition






45. Distributes cement grains - cement becomes more mushy -






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






47. Source of hotgases - biggest piece of moving equipment






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






49. High sulfate resistence -






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