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. For early strength gain






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






3. Cement paste has bulk SG< cement particles






4. Cement+course aggregate






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






6. Moderate Sulfate Resistance- large piers






7. Bending moment - no shear in middle third






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






9. Heavy traffic






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






11. Trapped air - reduces strength - ups permeabiity






12. By vibrating - otherwise rock pockets occure -






13. Good stability






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






15. Crush clinker into super fine powder






16. Stop and reactivate hydration process






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






18. To increase stability of materials - reduce rutting






19. Water beyond SSD condition






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






21. Source of hotgases - biggest piece of moving equipment






22. B/c of trucks over time






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






24. Normal- for general work






25. 94 lbs






26. Ups set time






27. makes it mushier because cement grains more distributed






28. Early stength at faster rate - for cold temps






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






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






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






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






33. Cement+water






34. Cement+sand






35. Ups capilary voids - lowers strength






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






37. From chemicals or excessive drying






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






39. High sulfate resistence -






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






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






42. Flowable - nonsegregating






43. Near surface water is cause






44. Low stability






45. Heat and pressure ex- marble - quaertzile






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






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






48. Distributes cement grains - cement becomes more mushy -






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






50. To improve workability for fresh concrete