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Civil Engineering Materials
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Avg score: 73% • Most missed: “Trim subgrade - moisten subgrade - compact (use vibratory roller) - do NOT depos…”
Civil Engineering Materials
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25 Questions

1. Flowable - nonsegregating

2. makes it mushier because cement grains more distributed

3. Ups set time

4. Distributes cement grains - cement becomes more mushy -

5. From chemicals or excessive drying

6. Sometimes worse

7. Near surface water is cause

8. Nonpotable/potable >90% - the acceptable

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

10. Trapped air - reduces strength - ups permeabiity

11. Cement+water

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

13. Crush clinker into super fine powder

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

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

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

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

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

19. For early strength gain

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

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

22. High sulfate resistence -

23. To improve workability for fresh concrete

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

25. Heat and pressure ex- marble - quaertzile

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