Relationship of bacterial infection and stress wave travel time in red oak lumber

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dc.contributor.authorVerkasalo, Erkki I.en
dc.contributor.departmentForestry and Forest Productsen
dc.date.accessioned2014-03-14T21:48:23Zen
dc.date.adate2009-10-31en
dc.date.available2014-03-14T21:48:23Zen
dc.date.issued1991en
dc.date.rdate2009-10-31en
dc.date.sdate2009-10-31en
dc.description.abstractAnaerobic bacterial infection increases the proclivity of red oak lumber to develop surface, internal and end checks, and develop or aggravate ring failure during drying. It also extends the drying time. Bacterial infection is hard to identify before drying without the use of costly, time- consuming tests. Thus, there is a need for an inexpensive, rapid and accurate method for the identification that can be used at a mill. This research project investigated the possibility to use stress wave timing for the identification of bacterial infection, by studying the relationship of the level of bacterial infection and impact-induced stress wave travel time across the grain of green 4/4 red oak lumber from Southcentral Virginia. Bacterial infection increased stress wave travel time, but a considerable overiap existed between infected and uninfected boards. Tests on tensile strength perpendicular to grain, which is critical for lumber to check during drying showed a decrease in strength due to the bacterial infection. A parallel kiln- drying experiment, following a standard drying schedule (T4D2), showed more drying defects in the infected lumber than in the uninfected lumber. Defects were also more frequent in lumber with a long stress wave travel time than in lumber with a short stress wave travel time.en
dc.description.degreeMaster of Scienceen
dc.format.extent148 leavesen
dc.format.mediumBTDen
dc.format.mimetypeapplication/pdfen
dc.identifier.otheretd-10312009-020145en
dc.identifier.sourceurlhttp://scholar.lib.vt.edu/theses/available/etd-10312009-020145/en
dc.identifier.urihttp://hdl.handle.net/10919/45349en
dc.language.isoenen
dc.publisherVirginia Techen
dc.relation.haspartLD5655.V855_1991.V474.pdfen
dc.relation.isformatofOCLC# 25402954en
dc.rightsIn Copyrighten
dc.rights.urihttp://rightsstatements.org/vocab/InC/1.0/en
dc.subject.lccLD5655.V855 1991.V474en
dc.subject.lcshBacterial diseasesen
dc.subject.lcshLumberen
dc.subject.lcshQuercus rubraen
dc.titleRelationship of bacterial infection and stress wave travel time in red oak lumberen
dc.typeThesisen
dc.type.dcmitypeTexten
thesis.degree.disciplineForestry and Forest Productsen
thesis.degree.grantorVirginia Polytechnic Institute and State Universityen
thesis.degree.levelmastersen
thesis.degree.nameMaster of Scienceen

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