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






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






3. Heavy traffic






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






5. Good stability






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






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






8. Ups set time






9. Near surface water is cause






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






11. Stop and reactivate hydration process






12. To increase stability of materials - reduce rutting






13. Cement+water






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






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






16. Trapped air - reduces strength - ups permeabiity






17. Flowable - nonsegregating






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






19. Source of hotgases - biggest piece of moving equipment






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






21. Cement+course aggregate






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






23. 94 lbs






24. makes it mushier because cement grains more distributed






25. Bending moment - no shear in middle third






26. By vibrating - otherwise rock pockets occure -






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






28. For early strength gain






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






30. Sometimes worse






31. Low stability






32. Heat and pressure ex- marble - quaertzile






33. To improve workability for fresh concrete






34. Early stength at faster rate - for cold temps






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






36. High sulfate resistence -






37. Cement paste has bulk SG< cement particles






38. Ups capilary voids - lowers strength






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






40. From chemicals or excessive drying






41. B/c of trucks over time






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






43. Nonpotable/potable >90% - the acceptable






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






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






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






47. Water beyond SSD condition






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






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






50. Crush clinker into super fine powder