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. Normal- for general work






2. 94 lbs






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






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






5. makes it mushier because cement grains more distributed






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






7. Ups capilary voids - lowers strength






8. Source of hotgases - biggest piece of moving equipment






9. From chemicals or excessive drying






10. Crush clinker into super fine powder






11. Water beyond SSD condition






12. To increase stability of materials - reduce rutting






13. Trapped air - reduces strength - ups permeabiity






14. Low stability






15. By vibrating - otherwise rock pockets occure -






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






17. Cement+sand






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






19. Heavy traffic






20. For early strength gain






21. Bending moment - no shear in middle third






22. To improve workability for fresh concrete






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






24. Moderate Sulfate Resistance- large piers






25. Ups set time






26. Nonpotable/potable >90% - the acceptable






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






28. Stop and reactivate hydration process






29. Near surface water is cause






30. Good stability






31. Early stength at faster rate - for cold temps






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






33. High sulfate resistence -






34. Sometimes worse






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






36. Flowable - nonsegregating






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






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






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






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






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






42. Cement+course aggregate






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






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






45. Cement paste has bulk SG< cement particles






46. Heat and pressure ex- marble - quaertzile






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






48. B/c of trucks over time






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






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