Abstract
Using eco-friendly recycled brick powder (RBP) derived from waste brick to prepare strain hardening cementitious composites (SHCC) provides a new way of recycling the construction and demolition waste (CDW), and the dosage of cement in SHCC can be decreased. This paper investigated the micro-properties and mechanical properties of SHCC containing RBP by a series of experiments. The results showed that RBP had typical characteristics of supplementary cementitious material (SCM). The addition of RBP increased the SiO2 content and decreased the hydration products in cementitious materials; in this case, the mechanical properties of mortar decreased with increasing RBP replacements, and a linear relationship was observed between them. It was noticed that the adverse effect of RBP on the mechanical properties decreased with increasing PVA fiber content in mortar. For SHCC containing various RBP replacements, the ultimate load increased, and the ultimate displacement decreased with increasing curing days. When using RBP to replace cement by weight, the ultimate displacement increased with the addition of RBP. Meanwhile, there was no significant reduction in the ultimate load of SHCC. When using RBP to replace fly ash (FA) by weight, the incorporation of RBP decreased the ultimate displacement of SHCC, whereas the ultimate load was improved. For example, the ultimate load and displacement of SHCC with 54%RBP were 17.6% higher and 16.4% lower, respectively, than those of SHCC with 54% FA.
Highlights
The rapid onset of global urbanization has resulted in a massive number of construction and demolition wastes (CDW) [1]
Considering that the recycled brick powder (RBP) is derived from the waste brick and no hydrated substance contained in it, the fineness of RBP should be higher than that of the cement and fly ash (FA), which is beneficial to improve the activity of RBP when using RBP as supplementary cementitious material (SCM) to replace the cement or FA in strain hardening cementitious composites (SHCC)
The results indicate that the ultimate load increases with increasing curing days; for example, when the curing duration is after 3 d, 14 d, and 28 d, the ultimate load of the SHCC-0%RBP is respectively 5.18 kN, 6.22 kN, and 7.70 kN, and the results are 4.9 kN, 6.28 kN, and 6.94 kN for the SHCC-54%RBP
Summary
The rapid onset of global urbanization has resulted in a massive number of construction and demolition wastes (CDW) [1]. In recent years, recycling technologies for CDW are developed, and the waste concrete and brick are recycled into recycled aggregate and used to prepare recycled aggregate concrete [6,7]. Being different from the recycled concrete aggregate, the utilization of recycled brick aggregate in construction engineering is very scarce because of recycled brick aggregate containing high porosity and water absorption; in this case, the recycling rate of waste brick was much lower than that of waste concrete in CDW [14]. Using RBP as SCM to prepare concrete is appropriate, and the RBP is sustainably recycled material. The utilization of RBP in SHCC decreases the dosage of cement and FA in SHCC, and promotes the recycling rate of the waste brick in CDW, which is eco-friendlier and more sustainable. The authors hope the findings in this paper are helpful to further research on the SHCC and CDW recycling
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