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






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






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






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






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






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






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






8. Cement+sand






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






10. Heavy traffic






11. Source of hotgases - biggest piece of moving equipment






12. Moderate Sulfate Resistance- large piers






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






14. Stop and reactivate hydration process






15. makes it mushier because cement grains more distributed






16. Sometimes worse






17. Normal- for general work






18. To increase stability of materials - reduce rutting






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






20. Ups capilary voids - lowers strength






21. To improve workability for fresh concrete






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






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






24. Distributes cement grains - cement becomes more mushy -






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






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






27. Low stability






28. Bending moment - no shear in middle third






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






30. Near surface water is cause






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






32. B/c of trucks over time






33. Cement+water






34. Crush clinker into super fine powder






35. 94 lbs






36. Cement paste has bulk SG< cement particles






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






38. High sulfate resistence -






39. Flowable - nonsegregating






40. Trapped air - reduces strength - ups permeabiity






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






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






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






44. Nonpotable/potable >90% - the acceptable






45. Ups set time






46. Heat and pressure ex- marble - quaertzile






47. Good stability






48. Water beyond SSD condition






49. By vibrating - otherwise rock pockets occure -






50. Early stength at faster rate - for cold temps