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Session 1 ic2011 patterson

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  • 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. 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. 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. Condition Chamber
  • 5. Condition Chamber
  • 6. Outside Air
  • 7. Outside Air
  • 8. Enclosed Over Water
  • 9. Enclosed Over Water
  • 10. Condition Chamber Moisture ContentsSpecies C/50 100 150 200Pine 13 12 11 8Red Oak 12 12 8 6Sweetgum 13 12 11 8
  • 11. Outside Air Moisture ContentsSpecies C/50 100 150 200Pine 14 13 12 10Red Oak 13 11 8 6Sweetgum 14 13 12 9
  • 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. 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. 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. Do Not Adjust for MC if theSamples Were Conditioned Under the Same Environment and forSufficient Time to Equalize.
  • 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. Questions?