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. From chemicals or excessive drying






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






3. Cement+water






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






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






6. To increase stability of materials - reduce rutting






7. Crush clinker into super fine powder






8. Sometimes worse






9. By vibrating - otherwise rock pockets occure -






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






11. Ups capilary voids - lowers strength






12. Good stability






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






14. B/c of trucks over time






15. Cement paste has bulk SG< cement particles






16. Source of hotgases - biggest piece of moving equipment






17. Heat and pressure ex- marble - quaertzile






18. 94 lbs






19. Normal- for general work






20. High sulfate resistence -






21. Cement+sand






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






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






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






25. Moderate Sulfate Resistance- large piers






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






27. Distributes cement grains - cement becomes more mushy -






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






29. Cement+course aggregate






30. To improve workability for fresh concrete






31. Water beyond SSD condition






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






33. For early strength gain






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






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






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






37. Trapped air - reduces strength - ups permeabiity






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






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






40. Early stength at faster rate - for cold temps






41. Heavy traffic






42. Nonpotable/potable >90% - the acceptable






43. Bending moment - no shear in middle third






44. Stop and reactivate hydration process






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






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






47. makes it mushier because cement grains more distributed






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






49. Near surface water is cause






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