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. Heat and pressure ex- marble - quaertzile






2. Good stability






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






4. Low stability






5. Near surface water is cause






6. makes it mushier because cement grains more distributed






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






8. Flowable - nonsegregating






9. Cement+course aggregate






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






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






12. Normal- for general work






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






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






15. Nonpotable/potable >90% - the acceptable






16. Cement+water






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






18. Ups capilary voids - lowers strength






19. To improve workability for fresh concrete






20. High sulfate resistence -






21. B/c of trucks over time






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






23. Cement+sand






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






25. Moderate Sulfate Resistance- large piers






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






27. From chemicals or excessive drying






28. To increase stability of materials - reduce rutting






29. Stop and reactivate hydration process






30. Crush clinker into super fine powder






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






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






33. Source of hotgases - biggest piece of moving equipment






34. Cement paste has bulk SG< cement particles






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






36. Heavy traffic






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






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






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






40. 94 lbs






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






42. Ups set time






43. Sometimes worse






44. By vibrating - otherwise rock pockets occure -






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






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






47. Bending moment - no shear in middle third






48. Trapped air - reduces strength - ups permeabiity






49. Early stength at faster rate - for cold temps






50. For early strength gain