Use of natural resins in repairing damaged timber beams – An experimental investigation

Adelaja Israel Osofero, Marco Corradi, Giulia Benedetti, Anthony Ede

Research output: Chapter in Book/Report/Conference proceedingPublished conference contribution

1 Citation (Scopus)
4 Downloads (Pure)


Different techniques including the application of steel elements, composite materials and polymeric resins have been used in the past to repair damaged timber beams. However, there is a growing need to replace these materials with those with minimal environmental impact. In addition, stringent requirements of conservation authorities on the compatibility between repair and parent materials have also necessitated search for innovative repair materials for timber beams. Therefore, an increasing shift of focus towards the use of materials derived from natural sources in repairing and reinforcing timber structures is currently experienced. This paper presents the results of an exploratory study on the use of natural resins (rosin and bone glue) in repairing oak timber beams. 15 oak timber beams with cross section dimensions of 67 x 67 mm and 1100 mm in length were tested in four-point bending to failure. Undamaged, damaged (unrepaired) and damaged but repaired timber beams (with rosin and bone glue) were tested. The effectiveness of the repair material and technique was analysed based on the bending capacity and mid span deflection at failure. The initial results show negligible effectiveness of rosin in repairing timber beams. In fact, about 16% reduction (average) in load carrying capacity with a corresponding 5% decrease (average) in maximum displacement was recorded. Relatively higher level of effectiveness was recorded with the use of bone glue (about 10 % average increase in load carrying capacity). However, over 30% corresponding average increase in the maximum displacement was also recorded. Further work investigating different repair techniques and other natural resins is presently underway.
Original languageEnglish
Title of host publicationIOP Conference Series: Materials Science and Engineering
Publication statusAccepted/In press - 2019
EventInternational Conference on Sustainable Infrastructural Development : Sustainable Infrastructural Development - Covenant University, Ota, Nigeria
Duration: 24 Jun 201926 Jun 2019
Conference number: 1st


ConferenceInternational Conference on Sustainable Infrastructural Development
Abbreviated titleICSID 2019

Bibliographical note

1st International Conference on Sustainable Infrastructural Development 24–28 June 2019, Covenant University, Canaan Land, Ota, Nigeria


  • bending capacity
  • damaged timber beams
  • Environmental impact
  • natural resins
  • repair material

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