Strength in concrete reinforced with recycled CFRP pieces

Re-use assessment of thermoset composite wastes as aggregate and filler replacement for concrete-polymer composite materials: A case study regarding GFRP pultrusion wastes

“…The higher specific surface area of GFRP waste particles when compared to sand particles, especially in the case of FW admixture, which requires higher contents of binder matrix for a proper wetting and cohesive bonding, is for certain the main reason for the observed inflexion points in the trend of the behaviour of the materials (around 8% in waste content for compression and 4% for flexure). Poor workability and deficient wetting of overall aggregates in cementitious concrete materials with increasing contents of FRP recyclates was also reported by Correia et al (2011) andOgi et al (2005). However, whereas in cementitious concrete mixtures the fine-tuning of the water/cement ratio may overcome this undesirable feature (but with an eventual decrease in final mechanical properties), in polymer concrete mixtures, higher binder contents are needed to improve wetting and workability, which leads to significant cost increases in the final product.…”

Sustainable waste recycling solution for the glass fibre reinforced polymer composite materials industry

“…Compared to related end-use applications of ground GFRP wastes in cementicious based concrete materials, the proposed solution overcomes some of the problems that have been found, namely: (a) incompatibilities arisen from alkalis-silica reaction [39]; (b) decrease in the mechanical properties due to higher water-cement ratio required to achieve the desirable workability [22,23,25]; and (c) weak adhesion at recyclates-binder interfaces.…”

“…Filler or reinforcement material for artificial wood [14], high density polyethylene (HDPE) plastic lumber [15], rubber pavement blocks [16], dense bitumen macadam [17], bulk (BMC) and sheet (SMC) moulding compounds [18], wood particleboard [9] and core material for textile sandwich structures [19], were some of the foreseen potential recycling applications. The most extensive research work has been carried out on Portland cement concrete, in which grinded GFRP and CFRP wastes have been incorporated either as reinforcement, aggregate or filler replacement [20][21][22][23][24][25][26]. Potential applications of concrete materials modified with GFRP waste include pre-cast paving slabs, roof tiles, wall panels, paving blocks and architectural cladding materials.…”

A Case Study on the Eco-Efficiency Performance of a Composite Processing Industry: Evaluation and Quantification of Potential Improvements

“…Over the last 20 years, several attempts have been made in order to solve this issue by putting considerable effort in the investigation of promising end-use applications for ground GFRP wastes. The most extensive research work has been carried out on Portland cement concrete in which mechanically recycled GFRP waste, and more rarely CFRP waste, have been incorporated either as reinforcement, aggregate or filler replacement [9][10][11][12][13][14]. In addition to environmental benefits, as function of specific mix design formulation, reported added values include slight to strong decreases of permeability with subsequent improved durability, less drying shrinkage, and a global cost reduction of raw materials.…”