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






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






3. Cement+sand






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






5. Heavy traffic






6. Heat and pressure ex- marble - quaertzile






7. Distributes cement grains - cement becomes more mushy -






8. Low stability






9. Cement paste has bulk SG< cement particles






10. Trapped air - reduces strength - ups permeabiity






11. Moderate Sulfate Resistance- large piers






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






13. For early strength gain






14. Water beyond SSD condition






15. Good stability






16. Sometimes worse






17. To increase stability of materials - reduce rutting






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






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






20. Early stength at faster rate - for cold temps






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






22. Nonpotable/potable >90% - the acceptable






23. 94 lbs






24. Cement+water






25. Near surface water is cause






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






27. Ups capilary voids - lowers strength






28. makes it mushier because cement grains more distributed






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






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






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






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






33. Bending moment - no shear in middle third






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






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






36. B/c of trucks over time






37. Stop and reactivate hydration process






38. High sulfate resistence -






39. Crush clinker into super fine powder






40. To improve workability for fresh concrete






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






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






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






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






45. By vibrating - otherwise rock pockets occure -






46. Cement+course aggregate






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






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






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






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