Use of recycled FRP reinforcing bar in concrete as coarse aggregate and its impact on the mechanical properties of concrete

Yazdanbakhsh, Ardavan; Bank, Lawrence C.; Chen, Chen

doi:10.1016/j.conbuildmat.2016.05.165

Cited by 48 publications

(25 citation statements)

References 10 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Two options to dispose of FRP composites at the EOL are used at the present -disposal in landfills and incineration (with or without energy recovery and subsequent disposal of the residual ash or reuse as a precursor for cement production in a cement kiln). Recycling options consist of reclamation of the constituent fibers or the resins by thermo-chemical methods (Oliveux et al, 2015) or recycling of small pieces of granular FRP material as filler material in concrete or other composites by cutting, shredding or grinding (Yazdanbakhsh and Bank, 2016a;Ribeiro et al, 2016)). Efforts to commercialize shredding and grinding of GFRPs for the filler market or for use in cement-kilns have not been commercially successful (Job et al, 2016;LZ Online, 2014).…”

Section: Motivation For the Proposed Researchmentioning

confidence: 99%

See 1 more Smart Citation

An integrated geospatial approach for repurposing wind turbine blades

Delaney

McKinley

Megarry

et al. 2021

Resources, Conservation and Recycling

View full text Add to dashboard Cite

Section: Motivation For the Proposed Researchmentioning

confidence: 99%

“…Recent research has also addressed recycled FRP materials as aggregates for concrete (Shahria Alam et al, 2013;Yazdanbakhsh and Bank, 2014;Yazdanbakhsh et al, 2016a). The reuse of parts of full-size FRP turbine blades is mentioned in Welstead et al, (2013) and has recently been discussed in the composite's trade news (MaterialsToday, 2016).…”

Section: Parametricmentioning

confidence: 99%

An integrated geospatial approach for repurposing wind turbine blades

Delaney

McKinley

Megarry

et al. 2021

Resources, Conservation and Recycling

View full text Add to dashboard Cite

“…Yazdanbakhsh et al. investigated the mechanical properties of concrete with recycled FRP rebars 66 or needles 67,68 as discrete reinforcement. The results showed that the lower compressive and tensile strength of FRP rebars concrete appears to be due to the weak bond between cut rebars and mortar, the FRP needles have significant positive effects on tensile strength and toughness of concrete without affecting its workability and stability.…”

Section: Reuse and Applicationmentioning

confidence: 99%

Recycling and reuse of composite materials for wind turbine blades: An overview

Chen

Wang

2019

Journal of Reinforced Plastics and Composites

115

View full text Add to dashboard Cite

Based on the increasing number of end of life wind turbine blades and the emphasis on resource conservation and environmental protection, more and more attention has been paid to the recycling and reuse of thermoset composite materials for wind turbine blades. This paper gives an overview of the main recycling technologies and reuse of recycled products. Current recycling technology still needs more work to move from laboratory stage to commercial production. Cheaper, less polluting, and more efficient recycling technologies are needed, along with remanufacturing technologies for high performance products can be obtained to expand the market for recycled materials. In addition, new environmentally friendly blade materials should be designed from the source, using natural fiber, modified thermosetting resin and recyclable thermoplastic resin, which make wind energy a truly clean energy.

show abstract

“…In a study by Yazdanbakhsh et al scrap from production of GFRP reinforcing bars (rebars) with different diameters (6, 10, 13, 16, 19 and 25 mm) were cut into short cylindrical pieces with aspect ratio of one. These pieces, referred to as GFRP Recycled Aggregate (GRA), were used as full and partial (40% by volume) replacement of coarse natural aggregate (NA) in two types of concrete with water to cement ratios of 0.57 and 0.44 [14]. Both the GRA and NA had the same particle size distribution according to ASTM C33 standard [15].…”

Section: Use Of Processed Gfrp Waste In Concrete As Coarse Aggregatementioning

confidence: 99%

Mechanical Processing of GFRP Waste into Large-Sized Pieces for Use in Concrete

2018

Self Cite

View full text Add to dashboard Cite

Recycling glass fiber reinforced polymer (GFRP) composite materials has been proven to be challenging due to their high mechanical performance and high resistance to harsh chemical and thermal conditions. This work discusses the efforts made in the past to mechanically process GFRP waste materials by cutting them into large-sized (cm scale) pieces, as opposed to pulverization, for use in concrete mixtures. These pieces can be classified into two main categories-coarse aggregate and discrete reinforcement, here referred to as "needles." The results from all the studies show that using GFRP coarse aggregate leads to significant reductions in the compressive strength and tensile strength of concrete. However, GFRP needles lead to sizable increases in the energy absorption capacity of concrete. In addition, if the glass fibers are longitudinally aligned within the needles, these elements can substantially increase the tensile strength of concrete. Processing GFRP waste into needles requires less energy and time than that for producing GFRP coarse aggregate. Also, compared to pulverized GFRP waste, which consists of broken and separate particles of glass and resin that at best can be used as low-quality fillers, GFRP needles are high strength composite elements.Recycling 2018, 3, 8 2 of 11 fibers [8]. These techniques are very costly and are justifiable only for carbon fiber reinforced polymer composite materials because of the high price of carbon fibers.Low-impact processing of GFRP into products which can be used in built infrastructure can have a significant beneficial impact on the environment, as it reduces the demand for natural resources and the need for landfilling. Mechanical recycling of GFRP is an attractive option in terms of lower energy demand and the avoidance of chemical processes. The energy required for mechanical recycling is between 0.5% and 5% of that required for chemical recycling and between 0.4% and 16% of the energy used for thermal recycling (pyrolysis) [9]. One issue with traditional mechanical processing (pulverizing or shredding) is that the processed GFRP is no longer a composite material. It consists of separate pieces of broken damaged fibers and resin particles and therefore has a negative impact on the mechanical properties of the new material in which it is incorporated [8,[10][11][12]. Cutting GFRP waste into relatively large pieces for use in new products, as opposed to grinding and shredding, is an attractive potential recycling option for two reasons: (1) the energy demand for cutting GFRP to large pieces is less than that required for grinding and shredding (since less surface is generated) and (2) cut pieces of GFRP are composite materials, rather than separate damaged fibers and resin particles, with mechanical properties the same as those of the GFRP before being processed.This work presents the main investigations performed in the past on the incorporation of coarse processed GFRP waste in concrete. In those studies, different types of GFRP products were processed into ele...

show abstract

Use of recycled FRP reinforcing bar in concrete as coarse aggregate and its impact on the mechanical properties of concrete

Cited by 48 publications

References 10 publications

An integrated geospatial approach for repurposing wind turbine blades

An integrated geospatial approach for repurposing wind turbine blades

Recycling and reuse of composite materials for wind turbine blades: An overview

Mechanical Processing of GFRP Waste into Large-Sized Pieces for Use in Concrete

Contact Info

Product

Resources

About