The utilization of active recycled powder from various construction wastes in preparing ductile fiber-reinforced cementitious composites: A case study. (December 2021)

• Record Type: Journal Article
• Authors: Liang, Chaofeng; Zhang, Yuming; Wu, Ruixue; Yang, Dingyi; Ma, Zhiming
• Is Part Of: Case studies in construction materials. Volume 15(2021)
• Publication Date: 2021-12
• Subjects: RP Recycled powder -- FRCC Fiber-reinforced cementitious composites -- RPP Recycled paste powder -- RMP Recycled mortar powder -- RCP Recycled concrete powder -- SCM Supplementary cementitious material -- F-0RP FRCC without RP incorporation -- F-18RMP Replacing 18% cement with RMP by mass in FRCC -- F-36RMP Replacing 36% cement with RMP by mass in FRCC -- F-54RMP Replacing 54% cement with RMP by mass in FRCC -- F-54RPP Replacing 54% cement with RPP by mass in FRCC -- F-54RCP Replacing 54% cement with RCP by mass in FRCC -- F-54RBP Replacing 54% cement with RBP by mass in FRCC -- F-54FA Replacing 54% cement with FA by mass in FRCC -- F-0% fiber RMP-prepared FRCC without PVA fiber incorporation -- F-0.5% fiber RMP-prepared FRCC with 0.5% PVA fiber -- F-1.0% fiber RMP-prepared FRCC with 1.0% PVA fiber -- F-2.0% fiber RMP-prepared FRCC with 2.0% PVA fiber -- F-10 μm FRCC including 54% RMP with a median diameter of 10 μm -- F-30 μm FRCC including 54% RMP with a median diameter of 30 μm -- F-90 μm FRCC including 54% RMP with a median diameter of 90 μm; Recycled powder -- Construction wastes -- Fiber-reinforced cementitious composites (FRCC) -- Mechanical properties -- Toughness; Building materials -- Case studies -- Periodicals; 691.05
• DOI: 10.1016/j.cscm.2021.e00650
• Languages: English
• ISSNs: 2214-5095

Abstract

Abstract: This work studies the feasibility of using recycled powder (RP) from construction waste to prepare fiber-reinforced cementitious composites (FRCC). The activity index of recycled powder from various construction wastes is 73.5-82.6% when RP particle size is lower relative to cement, and RP can be used as alternative binder in cementitious composites. The micro structure of RP is irregular, and the added RP decreases the hydration products and matrix strength of its prepared cementitious composites. The flexural load and displacement of RP-prepared FRCC increase with increasing dosage of PVA fiber. The utilized RP decreases the ultimate flexural load of FRCC, while increasing the ultimate flexural displacement. A good strain-hardening behavior occurs when high-volume RP incorporates, and multiple cracks form and distribute on the surface of RP-prepared FRCC; moreover, the decreased RP particle size improves the strain-hardening characteristic of its newmade FRCC. Keeping the substitution rates of fly ash and RP are the same, the ultimate flexural displacement and load of FRCC including RP are lower and higher than those of FRCC including fly ash, respectively. The utilized RP reduces the compressive strength of prepared FRCC, but the flexural strength to compressive strength ratio increases with increasing RP replacement ratios in FRCC. The addition of RP increases the toughness index of FRCC by 4.2-14.1% relative to FRCC without RP.