Accelerated curing of glued-in threaded rods by means of inductive heating – Part I: experiments

Threaded rods grouted in beech laminated veneer lumber

“…In an earlier study, Ratsch et al 6 investigated GiR featuring the very same beech LVL, M16‐8.8 threaded rods, and 100 mm embedment length. Unlike the presented study, bonding was achieved with a series of two component epoxies and polyurethanes, considering an adhesive layer of 2 mm.…”

“…The latter were also formulated in terms of average shear strength, which was computed as F max divided by π × ℓ × d H , with ℓ the embedment length of 100 mm, and d H the nominal diameter of the hole (discarding the depth of threads). For the sake of comparison, both load bearing capacities, and average shear strengths, of the presented GriRs were compared to previously published results of conventional adhesively bonded GiR taken from Reference 6 featuring the very same beech LVL, M16‐8.8 threaded rods, and 100 mm embedment length, with, however, an adhesive layer of 2 mm. Lastly, results were also evaluated in terms of statistical significance to the different parameters.…”

“…The increased interest for timber-based construction in recent years 1 has raised the demand for high-performance joints, for which glued-in rods (GiRs) [2][3][4] have proven to be the perfect answer. In essence, GiR are-as they name imply-rods glued (or bonded) into softwood 5 and hardwood, 6 or engineered wood products, as for example in glued laminated timber, 4 cross laminated timber, 7 or laminated lumber veneer. 8 Usually, metallic bars, either threaded rods 9 or conventional reinforcement bars, 10 are bonded (mostly) with two-component epoxies or polyurethanes 4 ; other rod types, as carbon-or glass-fiber reinforced polymers, 11,12 are, however, being increasingly considered.…”

Research status of glued-in rods connections in wood structures

“…Furthermore, the GIR adhesive's sluggish rate of curing is likely to cause issues like alignment flaws, therefore the issue of how to speed up the adhesive's curing is one that needs to be resolved. Ratsch et al [88,89] conducted a series of studies to solve the problem above; the first step was through the controlled induction heating of the twocomponent adhesives (2K-EPX and 2K-PUR, respectively) to hasten the curing process; in the second step, methods including inductive and resistive heating were used to accelerate curing; and the results demonstrated that both of the above methods accelerated the negative effect of processing defects (wood moisture, oil contamination of the threaded rod, adhesive voids, and rod corrosion) on the mechanical properties of the joints; and the results demonstrated that both of the above, and the epoxy resin could be obtained with better durability to some extent.…”

Az alkalmazott művészet létmódjai és a kreatív ipar kihívásai napjainkban : Faipari Mérnöki és Kreatívipari Kar tudományos kiadványa

“…Jóllehet a létfeledés egyik legmarkánsabb ismérve a feminin archetípusának elhalványulása. (Ed: Darida) Budapest: ELTE Eötvös Kiadó (41)(42)(43)(44)(45)(46)(47)(48)(49)(50)(51).…”