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. B/c of trucks over time






2. Moderate Sulfate Resistance- large piers






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






4. To improve workability for fresh concrete






5. Ups set time






6. Cement+sand






7. For early strength gain






8. Source of hotgases - biggest piece of moving equipment






9. By vibrating - otherwise rock pockets occure -






10. From chemicals or excessive drying






11. Ups capilary voids - lowers strength






12. To increase stability of materials - reduce rutting






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






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






15. Early stength at faster rate - for cold temps






16. 94 lbs






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






18. Cement+water






19. Sometimes worse






20. Water beyond SSD condition






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






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






23. Distributes cement grains - cement becomes more mushy -






24. Near surface water is cause






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






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






27. Nonpotable/potable >90% - the acceptable






28. Cement paste has bulk SG< cement particles






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






30. Heat and pressure ex- marble - quaertzile






31. Stop and reactivate hydration process






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






33. Crush clinker into super fine powder






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






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






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






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






38. Normal- for general work






39. Heavy traffic






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






41. makes it mushier because cement grains more distributed






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






43. Trapped air - reduces strength - ups permeabiity






44. Bending moment - no shear in middle third






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






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






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






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






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






50. Flowable - nonsegregating