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






2. Flowable - nonsegregating






3. By vibrating - otherwise rock pockets occure -






4. Cement paste has bulk SG< cement particles






5. Nonpotable/potable >90% - the acceptable






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






7. Early stength at faster rate - for cold temps






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






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






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






11. Heavy traffic






12. Heat and pressure ex- marble - quaertzile






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






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






15. Cement+course aggregate






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






17. B/c of trucks over time






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






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






20. Trapped air - reduces strength - ups permeabiity






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






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






23. Bending moment - no shear in middle third






24. Normal- for general work






25. 94 lbs






26. To improve workability for fresh concrete






27. Water beyond SSD condition






28. Distributes cement grains - cement becomes more mushy -






29. Low stability






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






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






32. Moderate Sulfate Resistance- large piers






33. For early strength gain






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






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






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






37. Cement+sand






38. Source of hotgases - biggest piece of moving equipment






39. Ups capilary voids - lowers strength






40. Near surface water is cause






41. From chemicals or excessive drying






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






43. To increase stability of materials - reduce rutting






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






45. Ups set time






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






47. makes it mushier because cement grains more distributed






48. Sometimes worse






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






50. Crush clinker into super fine powder