Badawy Amr H, El-Feky M S, El-Tair A Maher, Kohail Mohamed
Department of Civil Engineering, National Research Centre, Giza, Egypt.
Structural Engineering Department, German University in Cairo, Cairo, Egypt.
Sci Rep. 2023 Aug 7;13(1):12811. doi: 10.1038/s41598-023-39788-x.
The development of sustainable construction materials is a pressing concern for researchers worldwide, as the cement industry is a major contributor to environmental degradation. The incorporation of nano-materials with cement composites has emerged as a promising solution to sustainable materials production. In this study, the effect of the addition of nano cellulose produced from wood sawdust waste on the performance of cement-based nano-silica composite was investigated. The nano-materials were incorporated at low concentrations and in gel form to eliminate the need for any advanced dispersion techniques. The results indicated that the addition of even low concentrations of nano cellulose significantly enhanced the compactness and mechanical properties of the cement matrix. The crack propagation was observed to be arrested with better adherence to the cement hydration product, which resulted from the presence of nano-silica. The nano cellulose fibers were found to bridge the calcium silicate hydrate products, arresting the propagation of cracks at their initial condition. The high pozzolanic reactivity of nano-silica ensured a minimal amount of calcium hydroxide, which is a significant contributor to the carbon footprint of cement production. Overall, the findings of this study suggest that the incorporation of nano cellulose from wood sawdust waste with cement-based nano-silica composite can lead to the development of sustainable and high-performance building materials with improved mechanical properties and reduced environmental impact.
可持续建筑材料的开发是全球研究人员迫切关注的问题，因为水泥行业是环境退化的主要促成因素。将纳米材料与水泥基复合材料相结合已成为可持续材料生产的一种有前景的解决方案。在本研究中，研究了添加由木屑废料生产的纳米纤维素对水泥基纳米二氧化硅复合材料性能的影响。纳米材料以低浓度和凝胶形式加入，以消除对任何先进分散技术的需求。结果表明，即使添加低浓度的纳米纤维素也能显著提高水泥基体的密实度和力学性能。观察到裂纹扩展因与水泥水化产物的更好粘附而受阻，这是由于纳米二氧化硅的存在。发现纳米纤维素纤维桥接了硅酸钙水合物产物，在裂纹初始状态时阻止了裂纹扩展。纳米二氧化硅的高火山灰反应活性确保了氢氧化钙的含量最少，而氢氧化钙是水泥生产碳足迹的重要贡献者。总体而言，本研究结果表明，将木屑废料中的纳米纤维素与水泥基纳米二氧化硅复合材料相结合，可以开发出具有改善力学性能和降低环境影响的可持续高性能建筑材料。
