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. High sulfate resistence -






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






3. Nonpotable/potable >90% - the acceptable






4. B/c of trucks over time






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






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






7. To increase stability of materials - reduce rutting






8. Normal- for general work






9. Low stability






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






11. From chemicals or excessive drying






12. Moderate Sulfate Resistance- large piers






13. Near surface water is cause






14. Distributes cement grains - cement becomes more mushy -






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






16. Flowable - nonsegregating






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






18. Cement paste has bulk SG< cement particles






19. Source of hotgases - biggest piece of moving equipment






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






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






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






23. Water beyond SSD condition






24. Early stength at faster rate - for cold temps






25. Heavy traffic






26. Crush clinker into super fine powder






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






28. Ups set time






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






30. Heat and pressure ex- marble - quaertzile






31. Stop and reactivate hydration process






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






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






34. makes it mushier because cement grains more distributed






35. Cement+course aggregate






36. By vibrating - otherwise rock pockets occure -






37. For early strength gain






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






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






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






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






42. Cement+water






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






44. Trapped air - reduces strength - ups permeabiity






45. Good stability






46. To improve workability for fresh concrete






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






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






49. 94 lbs






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