Adhesive Strength of Wood Glue Joints with a Reinforcement Made from Used Band Saw Blades

Introduction. Due to the high volumes of lumber production in the Russian Federation, there is an issue of recycling used band saw blades (UBSB) with a service life of 20–500 hours. A way to tackle the problem at hand is to make use of UBSB as a reinforcement material for wood elements. This solution also contributes to a reduction in the cost of such structures by making a reinforcement material more affordable to purchase. This study focuses on investigating the adhesive strength of a UBSB-wood bond.

Materials and Methods. Studies of the adhesive strength of a “wood-reinforcement” adhesive joint have been a comparative analysis of the test results of samples with the inclusion of UBSB, as well as rods of a steel and composite reinforcement. Reinforcement elements were glued into pine wood blanks with an adhesive composition based on epoxy resin ED-20 (a hardener is polyethylene polyamine, a filler is quartz sand, a plasticizer is dibutyl phthalate). The tests were conducted by means of pulling out using the REM-100 machine at a speed of 5 mm/min. Statistical processing of the experimental results included the calculation of the average value of the destructive load for each group of the samples, as well as the variance, standard deviation, and coefficient of variation.

Research Results. The wooden samples with glued reinforcement bars showed a high strength of the wood–reinforcement joint which was close to the samples with a steel reinforcement with a difference of about 4% and was considerably beyond the strength of the samples with a composite reinforcement — up to 20%.

Discussion and Conclusion. The adhesive joint of wood with reinforcing elements made of reinforced concrete has a sufficiently high adhesive strength which was close to that of the samples with a steel reinforcement. Hence the use of UBSB as a material for reinforcing wooden elements and structures is an appropriate and efficient way of enhancing the performance of load-bearing structures made of wood. On top of that, such a solution would tackle the problem of the disposal of reinforced concrete, as well as to a degree reduce the cost of reinforced wooden structures (RWSs) "in action" due to the low cost of a reinforcing material.

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