Experimental Study on Optimization of Mechanical Properties of Fiber-Reinforced Lightweight Concrete

DOI: https://doi.org/10.62517/jcte.202506405

Author(s)

Ansheng Wu*, Andong Wang

Affiliation(s)

Shaanxi Railway Institute, Weinan, Shaanxi, China *Corresponding Author

Abstract

In response to the energy-saving, emission-reduction, and low-carbon targets in the construction industry, this study investigates fiber-reinforced lightweight concrete. Lightweight concrete utilizing volcanic cinder as aggregate is proposed, with polypropylene fibers employed as an admixture. The interfacial bond strength between concrete and steel reinforcement in C30 fiber-reinforced lightweight concrete was studied through pull-out tests. A total of 90 specimens were divided into 9 groups for the pull-out tests. By examining the mechanical properties and microstructure of the concrete samples, the mechanism by which fibers influence the interfacial bond failure of lightweight concrete was understood. The effects of reinforcement bar diameter and bond length on the bond strength of the fiber-reinforced lightweight concrete were investigated. The results indicate that bond strength decreases with an increase in rebar size and embedment length. Based on the experimental data, a constitutive curve for the bond strength of C30 fiber-reinforced lightweight concrete with this specific mix proportion was fitted, providing a reference for the application of lightweight concrete materials.

Keywords

Light Concrete; Volcanic Slag Aggregate; Bonding Strength; Polypropylene Fiber

References

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