Session 1 ic2011 patterson

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Session 1 ic2011 patterson

  1. 1. Do You Always Adjust Test Results To 12 % MC? NO! David W. Patterson Professor Emeritus Jonathan Hartley Program Technician Arkansas Forest Resources Center University of Arkansas - Monticello
  2. 2. Introduction• I have reviewed many manuscripts submitted for publication• Many Authors feel obligated to mathematically adjust everything to 12% MC before analyzing the data• This can be Good!• This can be Bad!
  3. 3. Tests Methods• Species – pine, red oak, sweetgum• Size – 4 cm by 4 cm by 25 cm• Replications: 10• All Dried at 50°C• Treatments: Control, 100, 150, 200°C• Duration: 6 hours• Conditioning Time: 2 months• Conditioning Environment – Condition Chamber – Outside Air – Enclosed Over Water
  4. 4. Condition Chamber
  5. 5. Condition Chamber
  6. 6. Outside Air
  7. 7. Outside Air
  8. 8. Enclosed Over Water
  9. 9. Enclosed Over Water
  10. 10. Condition Chamber Moisture ContentsSpecies C/50 100 150 200Pine 13 12 11 8Red Oak 12 12 8 6Sweetgum 13 12 11 8
  11. 11. Outside Air Moisture ContentsSpecies C/50 100 150 200Pine 14 13 12 10Red Oak 13 11 8 6Sweetgum 14 13 12 9
  12. 12. Enclosed Over Water Moisture ContentsSpecies C/50 100 150 200Pine 18 15 13 11Red Oak 15 12 10 7Sweetgum 17 14 12 10
  13. 13. Some Mechanical Properties• All 3 Species• 5 Replications• Controls and 200°C• Condition Chamber and Enclosed Over Water• Tested in Compression Parallel to the Grain
  14. 14. Test Results PSISpecies CC EOW C/50 200 C/50 200Pine 5269 6475 4271 5501Red Oak 5424 7109 5551 6782Sweetgum 5546 7009 5010 6169
  15. 15. Do Not Adjust for MC if theSamples Were Conditioned Under the Same Environment and forSufficient Time to Equalize.
  16. 16. In 1986 there was an editorial in the W&FS journal about not adjusting specific gravity if the difference was caused by the treatment.
  17. 17. Questions?

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