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






2. Sometimes worse






3. Stop and reactivate hydration process






4. Flowable - nonsegregating






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






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






7. Nonpotable/potable >90% - the acceptable






8. For early strength gain






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






10. To increase stability of materials - reduce rutting






11. Cement+water






12. Moderate Sulfate Resistance- large piers






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






14. Cement+sand






15. High sulfate resistence -






16. Near surface water is cause






17. Cement paste has bulk SG< cement particles






18. 94 lbs






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






20. Good stability






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






22. Normal- for general work






23. Ups set time






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






25. Source of hotgases - biggest piece of moving equipment






26. Early stength at faster rate - for cold temps






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






28. B/c of trucks over time






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






30. Heavy traffic






31. From chemicals or excessive drying






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






33. To improve workability for fresh concrete






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






35. By vibrating - otherwise rock pockets occure -






36. Heat and pressure ex- marble - quaertzile






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






38. Bending moment - no shear in middle third






39. Cement+course aggregate






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






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






42. Ups capilary voids - lowers strength






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






44. makes it mushier because cement grains more distributed






45. Trapped air - reduces strength - ups permeabiity






46. Water beyond SSD condition






47. Crush clinker into super fine powder






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






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






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