Mechanical performance of polyurethane and epoxy adhesives in connections with glued-in rods at elevated temperatures

Authors: Verdet, MathieuSalenikovich, Alexander; Cointe, Alain; Coureau, Jean-Luc; Galimard, PhilippeMuñoz Toro, Williams ManuelBlanchet, Pierre; Delisée, Christine
Abstract: Glued-in rods have succesfully been used for connections of reinforcement of timber structures due to their high strenght and stiffness. However, their performance is potentially sensitive to temperature. This paper deals with an experimental investigation of the connections and adhesives in elevated temperatures. First, dynamic mechanical analysis (DMA) tests were performedto characterize an epoxy (EPX) and a polyurethane (PUR) adhesive. The evolution of the stiffness and the glass transition temperature, Tg, were measured in the range of 30°C to 120°C. Then, a total of 66 specimens with glued-in rods and the same adhesives were tested under a static tensile load at 20°C, 40°C, 50°C, 60°C, and 70°C. In both types of tests, the EPX outperformed PUR due to its higer stiffness at temperatures of up tu 40°C; however, it showed a more rapid degradation of the stiffness and strenght than the PUR at higher temperatures. No direct correlation was established between the Tg and the performance of the connections. The test results suggest that timber structures with glued-in rods may be vulnerable in service at temperatures above 40°C.
Document Type: Article de recherche
Issue Date: 9 October 2016
Open Access Date: 28 November 2016
Document version: VoR
This document was published in: BioResources, 11 (4), 8200-8214 (2016)
Dept. of Wood and Paper Science, College of Natural Resources, North Carolina State University
Alternative version: 10.15376/biores.11.4.8200-8214
Collection:Articles publiés dans des revues avec comité de lecture

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