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. By vibrating - otherwise rock pockets occure -






2. From chemicals or excessive drying






3. Ups set time






4. Heat and pressure ex- marble - quaertzile






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






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






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






8. Water beyond SSD condition






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






10. Cement+course aggregate






11. Cement+sand






12. 94 lbs






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






14. Moderate Sulfate Resistance- large piers






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






16. Cement paste has bulk SG< cement particles






17. To improve workability for fresh concrete






18. Trapped air - reduces strength - ups permeabiity






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






20. Heavy traffic






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






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






23. To increase stability of materials - reduce rutting






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






25. B/c of trucks over time






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






27. Bending moment - no shear in middle third






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






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






30. Crush clinker into super fine powder






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






32. Cement+water






33. Flowable - nonsegregating






34. Good stability






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






36. Low stability






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






38. Early stength at faster rate - for cold temps






39. Source of hotgases - biggest piece of moving equipment






40. Distributes cement grains - cement becomes more mushy -






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






42. Near surface water is cause






43. High sulfate resistence -






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






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






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






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






48. Normal- for general work






49. Stop and reactivate hydration process






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