Abstract
Recycled concrete that is produced with recycled coarse aggregate is proven to be practical, whereas recycled fine aggregates (RFA) and recycled powder (RP) still lack effective application. In this study, the feasibility of utilizing RFA and RP to develop recycled foamed concrete (RFC) was investigated for use in an engineered material arresting system (EMAS). The fluidity, compressive strength, energy absorption properties, and water softening performance of RFC were tested and evaluated. The compressive strength of RFC decreased by 5.0–49.4% with an increase in the RFA content from 25% to 100%, and the effects that RFA has on the strength of RFC were larger than those of conventional concrete. Moreover, the particle size of RFA influenced the fluidity and compressive strength of RFC. Also, except for the foamed concrete with 100% RFA, other mixtures all met the requirements of EMAS in terms of energy absorption properties and water softening performance. By comparison, the 75% replacement rate mixture with mid-sized RFA performed best in this study, and therefore, it is suggested for use in developing foamed concrete for EMAS. Although the source and the components of recycled fines are complicated and difficult to use, the feasibility of their application in RFC for EMAS is proven in this study, and it is believed that this work contributes to the sustainable development of the construction industry.
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