Browsing by Keyword "Resin"
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Item LOWFLIP - Tailored snap-cure prepregs for novel composite production processes(European Conference on Composite Materials, ECCM, 2016) Meinhardt, Thomas; Harismendy, Isabel; Heieck, Frieder; POLIMEROSThe goal of EU-funded project "LOWFLIP" (= low cost flexible integrated composite process) is the development of low cost manufacturing processes for composite parts using automated handling solutions, multifunctional low cost toolings and tailored fast-curing prepreg materials. These so called "snap-cure" prepregs are based on heavy-tow (50k) carbon fibers and a novel epoxy resin system developed by SGL that combines fast curing at elevated temperatures (e.g. 15 min at 120°C) with a long shelf-life at room temperature (4 weeks). The glass transition temperature of 125°C and its rapid buildup allow for a quick demoulding of manufactured composite parts. Tailored tack for automated processes such as pick & place or tape laying applications and the possibility to use out-of-autoclave curing methods are additional key features of the developed materials. The development of these new snap-cure prepreg materials and their properties are subject of this paper.Item Mechanical expectations of a high performance concrete based on a polymer binder and reinforced with non-metallic rebars(2008-10) San-José, José T.; Vegas, Iñigo J.; Moisés Frías, Frías; GENERALA high performance concrete, known as polymer concrete, made up of natural aggregates and an orthophthalic polyester binder, reinforced with non-metallic bars (glass reinforced polymer) has been studied. The material is described at micro and macro level, presenting the key physical and mechanical properties using different experimental techniques. Furthermore, a full description of non-metallic bars is presented to evaluate its structural expectancies, embedded in the polymer concrete matrix. Given the closed porosity obtained in polymer concrete, its microstructure continuity and organic nature of the binder, this material is highly protected against atmospheric conditions, corrosion and chemical attacks. The present research work concludes how the structural compatibility, between polymer concrete and non-metallic bars, is obtained in the monotonic bonding tests by providing higher adherence values than traditional reinforced concrete.Item Mechanical recycling of GFRP waste as short-fiber reinforcements in microconcrete(2014-08-14) García, D.; Vegas, I.; Cacho, I.; TRAZABILIDAD CIRCULAR; GENERALThe suitability of mechanically recycled glass fiber reinforced plastics (rGFRP) from different sources as short fibers is considered for precast microconcrete components. Shredding and screening processes were successively adjusted to obtain a high-fiber content product with fiber lengths optimized for flat microconcrete elements. The physical-mechanical properties of the concrete with rGFRP were characterized by compression and bending tests as well as shrinkage stability and alkali-aggregate reaction. Furthermore, the interaction between the rGFRP and the cementitious matrix was observed and characterized by scanning electron microscopy. It was found that when the rGFRP material obtained from an optimized milling process was used to prepare the microconcrete specimens (40 × 40 × 160 mm3), the flexural and compressive strength at 28 days increased by 16% and 22%, respectively, in comparison to the control specimens.