Abstract
The suitability of three new lightweight aggregates containing carbon fiber residues (CAs) as components in structural lightweight concrete has been studied. Prismatic concrete specimens were prepared using these CAs as a coarse fraction. Additional specimens of normal-weight aggregate, commercial lightweight aggregate and mortar were prepared for comparison. The CA-concrete samples (CACs) have yielded compressive strength values between 35 and 55 MPa as well as low density and thermal conductivity results. Furthermore, the CACs have displayed the highest ratios of mechanical strength over density and the thermal conductivity, which means that there is a better balance between their mechanical and physical properties than in the other samples studied. These results indicate that the new CAs could have great potential for use in structural lightweight concrete, also complying with the principles of the Circular Economy.
Highlights
The suitability of three new lightweight aggregates containing carbon fiber residues (CAs) as components in structural lightweight concrete has been studied
Likewise, according to the Spanish guidelines included in EHE-08 [4], a lightweight aggregate concrete (LWAC) would be suitable for use in structural purposes as long as its minimum characteristic compressive strength at 28 days is 15 MPa in mass or 25 MPa in reinforced or prestressed layout
The carbon fiber residue was supplied by ICSA-Aernnova (Toledo, Spain) in the form of stiff sheets from the cutting of AS4 and IM7 carbon fiber fabric, which were embedded in a hardened HexPly®8552 epoxy matrix
Summary
The suitability of three new lightweight aggregates containing carbon fiber residues (CAs) as components in structural lightweight concrete has been studied. The CA-concrete samples (CACs) have yielded compressive strength values between 35 and 55 MPa as well as low density and thermal conductivity results. The CACs have displayed the highest ratios of mechanical strength over density and the thermal conductivity, which means that there is a better balance between their mechanical and physical properties than in the other samples studied. These results indicate that the new CAs could have great potential for use in structural lightweight concrete, complying with the principles of the Circular Economy. The use of LWA in construction goes back far in antiquity (e.g. Pantheon in Rome [5]), the most conventional industrial process to produce
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