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. Early stength at faster rate - for cold temps






2. High sulfate resistence -






3. 94 lbs






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






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






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






7. To improve workability for fresh concrete






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






9. Sometimes worse






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






11. B/c of trucks over time






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






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






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






15. Moderate Sulfate Resistance- large piers






16. Cement+course aggregate






17. Near surface water is cause






18. Bending moment - no shear in middle third






19. Cement paste has bulk SG< cement particles






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






21. Heat and pressure ex- marble - quaertzile






22. Water beyond SSD condition






23. Trapped air - reduces strength - ups permeabiity






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






25. Cement+sand






26. makes it mushier because cement grains more distributed






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






28. Stop and reactivate hydration process






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






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






31. Ups set time






32. From chemicals or excessive drying






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






34. Nonpotable/potable >90% - the acceptable






35. Ups capilary voids - lowers strength






36. Crush clinker into super fine powder






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






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






39. To increase stability of materials - reduce rutting






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






41. Low stability






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






43. By vibrating - otherwise rock pockets occure -






44. Normal- for general work






45. Distributes cement grains - cement becomes more mushy -






46. Good stability






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






48. For early strength gain






49. Heavy traffic






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