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. Cement paste has bulk SG< cement particles






2. Source of hotgases - biggest piece of moving equipment






3. To improve workability for fresh concrete






4. For early strength gain






5. By vibrating - otherwise rock pockets occure -






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






7. Distributes cement grains - cement becomes more mushy -






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






9. Early stength at faster rate - for cold temps






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






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






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






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






14. To increase stability of materials - reduce rutting






15. Near surface water is cause






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






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






18. Ups capilary voids - lowers strength






19. Good stability






20. Cement+course aggregate






21. Heat and pressure ex- marble - quaertzile






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






23. Ups set time






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






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






26. Water beyond SSD condition






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






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






29. Bending moment - no shear in middle third






30. Crush clinker into super fine powder






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






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






33. Cement+water






34. 94 lbs






35. Nonpotable/potable >90% - the acceptable






36. From chemicals or excessive drying






37. Trapped air - reduces strength - ups permeabiity






38. Normal- for general work






39. Low stability






40. Stop and reactivate hydration process






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






42. Moderate Sulfate Resistance- large piers






43. Flowable - nonsegregating






44. Sometimes worse






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






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






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






48. High sulfate resistence -






49. B/c of trucks over time






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