Effect of Nano-Modified Recycled Wood Fibers on the Micro/Macro Properties of Rapid-Hardening Sulfoaluminate Cement-Based Composites
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View abstract on PubMed
Summary
This summary is machine-generated.Recycled wood fiber (RWF) in sulfoaluminate cement (SAC) composites shows promise for sustainable construction. KH560 modification significantly enhances RWF-SAC material strength and durability compared to nano-silica, offering a pathway for low-carbon building materials.
Area Of Science
- Materials Science
- Civil Engineering
- Sustainable Construction
Background
- Recycled wood fiber (RWF) is an eco-friendly construction material with potential as cementitious reinforcement.
- Waste wood valorization aligns with environmental protection and resource recycling goals.
- Sulfoaluminate cement (SAC) offers rapid setting and low shrinkage, making it suitable for composite development.
Purpose Of The Study
- To develop high-performance SAC-RWF composites using RWF modified with nano-silica (NS) and a silane coupling agent (KH560).
- To investigate the effects of these modifications on mechanical properties, shrinkage, hydration, and microstructure.
- To identify the optimal modification strategy for sustainable, low-carbon construction materials.
Main Methods
- Preparation of SAC-RWF composites with varying RWF content and modifications (NS, KH560).
- Systematic evaluation of mechanical properties (flexural and compressive strength), drying shrinkage, water absorption, and thermal conductivity.
- Micro-structural analysis using techniques to observe hydration characteristics and interfacial bonding.
Main Results
- Optimal performance achieved at 20% RWF content and a water-cement ratio of 0.5.
- KH560 modification yielded superior improvements in 28-day flexural (8.5%) and compressive strength (14.3%) compared to NS modification.
- Both modifiers reduced water absorption and drying shrinkage, with KH560 showing a significant 27.2% reduction in shrinkage.
- Microstructure analysis indicated accelerated hydration and enhanced interfacial bonding, particularly with KH560.
Conclusions
- KH560 modification provides superior enhancements to SAC-RWF composites compared to NS modification.
- The developed materials offer a sustainable and high-performance alternative for low-carbon construction.
- The study presents a technical pathway for balancing functional properties in recycled wood fiber cement-based materials.
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