Preparation and performance of high belite sulfoaluminate cement-based recycled wood fiber low-carbon material

Using waste wood to prepare recycled wood fiber (RWF) and using it to enhance low-carbon cement-based materials can achieve the recycling utilization of waste resources, which meets the needs of green and sustainable development strategy. In this study, the performance of high-belite sulfoaluminate cement (HBSC) composites reinforced with recycled wood fibers (RWFs) derived from construction waste wood was investigated. The effects of RWF content and water-to-cement ratio on mechanical properties, hydration characteristics, thermal conductivity, and micro-structure were systematically evaluated. Increasing RWF content resulted in an initial increase followed by a decrease in the mechanical properties of HBSC-based materials. A 20% RWF incorporation simultaneously optimized flexural and compressive strength while mitigating crack propagation. The addition of RWF decreased the dry density of HBSC. Thermal conductivity exhibited a linear correlation with dry density and decreased with higher water-cement ratios. At 20% RWF content and a water-cement ratio of 0.45, the microstructure of the HBSC composite became denser (or more refined in pore structure), resulting in the optimal comprehensive performance.