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. 94 lbs






2. To improve workability for fresh concrete






3. Cement+water






4. To increase stability of materials - reduce rutting






5. Normal- for general work






6. Near surface water is cause






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






8. Nonpotable/potable >90% - the acceptable






9. Ups set time






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






11. Trapped air - reduces strength - ups permeabiity






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






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






14. Water beyond SSD condition






15. Early stength at faster rate - for cold temps






16. From chemicals or excessive drying






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






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






19. Stop and reactivate hydration process






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






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






22. Source of hotgases - biggest piece of moving equipment






23. Cement+sand






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






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






26. For early strength gain






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






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






29. Good stability






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






31. High sulfate resistence -






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






33. Flowable - nonsegregating






34. Cement+course aggregate






35. Moderate Sulfate Resistance- large piers






36. makes it mushier because cement grains more distributed






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






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






39. Low stability






40. By vibrating - otherwise rock pockets occure -






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






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






43. Bending moment - no shear in middle third






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






45. Cement paste has bulk SG< cement particles






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






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






48. Heavy traffic






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






50. Heat and pressure ex- marble - quaertzile