氧化石墨烯-沙漠砂水泥基材料力学性能研究

为了弥补沙漠砂水泥基材料的力学缺陷,提高沙漠砂水泥基材料的工程适应性,进而合理利用中西部地区丰富的沙漠资源。本研究提出了氧化石墨烯(GO)改善沙漠砂水泥基材料力学性能的方案。试验发现,沙漠砂的过量掺入严重影响水泥基材料的力学性能,GO的掺入可以改善此不足,当GO掺入量为0.03%时,配制出了28 d抗压强度达到空白标准砂试件的125.41%,抗折强度达标准砂试块94.9%的全沙漠砂水泥基材料。通过扫描电镜的表面形貌观察可知,GO的掺入使水化产物形成致密规则且相互交联的团装晶体,并可以阻止纳米裂缝的持续发展。

Study on Mechanical Properties of Graphene Oxide-Desert Sand Cement Matrix Composites

A suggestion using graphene oxide (GO) to improve the mechanical properties of desert-sand based cement matrix composites was presented in order to compensate its mechanical imperfection, improve its engineering adaptability, and rationally utilize the rich desert resources in the central and western regions of China. The mechanical test shows that the incorporation of desert sand severely degrades the mechanical properties of cement-based materials. When the amount of GO incorporated was 0.03%, the full desert sand-based cement matrix composites was prepared, which the 28 d compressive strength was 125.41% of the blank standard sand test piece, and the flexural strength reached 94.9% of the standard sand test piece. Notably, it can be indicated from the surface morphology of the scanning electron microscope that the incorporation of GO can make the hydrated product into dense and regular cross-linked clustered crystals, and can prevent the continuous development of nano-cracks.