Abstract
The tests included the determination of the reinforcement effectiveness of old larch timber originating from a building built in 1860 with the use of carbon-fibre and aramid-fibre mats and strips, BFRPs and GFRPs. The test results showed that in old solid timber pieces from European larch (Larix decidua Mill.), the highest mean flexural bending capacity occurred in samples reinforced with carbon-fibre mats (increase in flexural bending capacity was 60.66% in relation to non-reinforced elements), while the lowest flexural bending capacity of the tested components occurred with reinforcement with GFRP (10 mm in diameter) (increase by only 19.04% in relation to non-reinforced elements). Additionally, bending tests of repaired 130-year-old pine (Pinus sylvestris L.) beams were shown (real-size scale) using CFRP strips and mats. The problems associated with the delamination of the CFRP strip due to uneven deformation of the damaged timber surface and the effectiveness of these repairs are also shown.
Highlights
In addition to stone and earth, wood is the oldest building material
GFRP—SWZLPsz), were visually strength sorted according to PN-D-94021:2013-10 [18] and divided
The BD5 beam was repaired with a S512 strip by gluing it to the lower surface of the beam over its entire length (Figure 7)
Summary
In addition to stone and earth, wood is the oldest building material. It is still used today for building structures. Wood has advantageous physical and chemical properties, high strength, and low specific weight. This material is resistant to the action of many chemical substances. Structural components made of timber have a long lifespan at moderate maintenance costs during the structure’s service life. Constant care and periodic checks are required for timber structures to remain in service. Inspections, carried out on a regular basis, make it possible to reveal harmful destructive processes that can result in the deterioration of the structure serviceability properties, or failures
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