Abstract
Carbon fiber mesh reinforced cement-based composites (CMCCs) have received extensive attention in the field of engineering repair and structural reinforcement due to their outstanding properties such as two-way force, rust prevention, high specific strength, and low base surface requirements. However, the development of this material has been slowed down to some extent due to the poor interfacial bonding between the carbon fiber mesh and the cement matrix. In this paper, a novel fabrication strategy was proposed in which the carbon fiber mesh was modified with epoxy resin and silane coupling agent (SCA) to increase its surface chemical activity. Meanwhile, the hydroxymethyl cellulose (HMC) was also filled into the concrete matrix to improve the mechanical strength of the matrix as well as the load transfer behaviors between the mortar and carbon fiber (CF) mesh. The potential to employ SCA and HMC was evaluated for the making of CMCCs via the above methods. The results showed that the longitudinal shear strength of composites with SCA and SCA&HMC increased by 26.6% and 56.1% compared to those of CF with epoxy resin (EP) reinforced composites, respectively. The flexural strength of composite with SCA&HMC increases by 147.6% compared to I-(F) without CF. The novel II-HCM&CF/EP-SCA composites with excellent performance are promised to be applied in practical uses.
Highlights
With the rapid development of the construction industry around the world, the number of different buildings based on masonry structure has increased dramatically
Carbon fiber mesh reinforced cement-based composites (CMCCs), thanks to their outstanding advantages of two-way force, rust prevention, high specific strength, and low base surface requirements have attracted the attention of researchers and industry at home and abroad
For the composites made by double carbon fiber meshes, the curves of I-CF/epoxy resin (EP), I-CF/EP-silane coupling agent (SCA), and II-hydroxymethyl cellulose (HMC)&CF/EP-SCA had as sawtooth condition as the load value continued to increase
Summary
With the rapid development of the construction industry around the world, the number of different buildings based on masonry structure has increased dramatically. Jacopo et al showed that interfacial mechanical riveting strength can be achieved by adding different sizes of quartz sand at the interface [12] From another aspect, the incorporation of polymer coating between fibers and the resin matrix will increase the viscous character of the material through the stick–slip action and the shear deformation occurring on the viscoelastic interlayer–matrix interface [13,14]. Li et al proved that the interfacial shear strength of composites improved by 43% using the surface coating treatment for aramid fiber by epoxy resin and silane coupling agent [21]. A combined strategy was proposed in which the chemical activity of a carbon fiber mesh surface was increased mainly by introducing the polar group, and the interface between mortar and carbon fiber fabric was modified by SCA and hydroxymethyl cellulose (HMC). The failure modes of the composites were discussed to reveal the role of interface on the fracture behaviors
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