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






2. High sulfate resistence -






3. Low stability






4. Trapped air - reduces strength - ups permeabiity






5. Normal- for general work






6. From chemicals or excessive drying






7. Cement+course aggregate






8. Flowable - nonsegregating






9. Distributes cement grains - cement becomes more mushy -






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






11. Crush clinker into super fine powder






12. B/c of trucks over time






13. For early strength gain






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






15. Cement paste has bulk SG< cement particles






16. Near surface water is cause






17. Early stength at faster rate - for cold temps






18. Heat and pressure ex- marble - quaertzile






19. To increase stability of materials - reduce rutting






20. Cement+water






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






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






23. Sometimes worse






24. Bending moment - no shear in middle third






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






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






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






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






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






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






31. By vibrating - otherwise rock pockets occure -






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






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






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






35. To improve workability for fresh concrete






36. 94 lbs






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






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






39. Nonpotable/potable >90% - the acceptable






40. Heavy traffic






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






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






43. Good stability






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






45. Source of hotgases - biggest piece of moving equipment






46. Cement+sand






47. Ups capilary voids - lowers strength






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






49. makes it mushier because cement grains more distributed






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