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. Heat and pressure ex- marble - quaertzile






3. From chemicals or excessive drying






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






5. Cement paste has bulk SG< cement particles






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






7. 94 lbs






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






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






10. Moderate Sulfate Resistance- large piers






11. Low stability






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






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






14. Normal- for general work






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






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






17. Trapped air - reduces strength - ups permeabiity






18. Cement+course aggregate






19. By vibrating - otherwise rock pockets occure -






20. To increase stability of materials - reduce rutting






21. Cement+water






22. Distributes cement grains - cement becomes more mushy -






23. Good stability






24. For early strength gain






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






26. Water beyond SSD condition






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






28. B/c of trucks over time






29. Early stength at faster rate - for cold temps






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






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






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






33. Ups capilary voids - lowers strength






34. Crush clinker into super fine powder






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






36. Bending moment - no shear in middle third






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






38. Stop and reactivate hydration process






39. Cement+sand






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






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






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






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






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






45. makes it mushier because cement grains more distributed






46. To improve workability for fresh concrete






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






48. Source of hotgases - biggest piece of moving equipment






49. Nonpotable/potable >90% - the acceptable






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