纳米纤维素对普通硅酸盐水泥力学性能及耐久性能的影响探究

Study on the effect of nanocellulose on mechanical and durability properties of ordinary Portland cement

旨在探讨纳米纤维素(NC)掺入对普通硅酸盐水泥性能的影响。通过力学性能、抗冻融性能、抗氯离子扩散性能及碳化试验,分析不同纳米纤维素掺量对水泥基材料性能的作用机制。结果表明,适量的纳米纤维素(0.1%~0.15%)能显著提高水泥的抗压强度和抗折强度,掺量为0.15%时,水泥28d抗压强度提高了28.9%。纳米纤维素还显著增强了水泥的抗冻融性能,添加0.15%时,试件的质量损失率在200次冻融循环后降至0.994%。掺入0.1%~0.15%纳米纤维素后,水泥基体的氯离子扩散系数明显降低,表现出更好的抗氯离子侵蚀能力。0.15%纳米纤维素掺量对普通硅酸盐水泥的抗碳化性能也有较好的改善。研究显示,纳米纤维素是一种有效的水泥基复合材料改性剂,可显著改善其力学性能和耐久性。

This study aims to investigate the effects of nanocellulose(NC)addition on the performance of ordinary Portland cement.Through mechanical properties,freeze-thaw resistance,chloride ion diffusion resistance,and carbonation tests,the mechanism of the effect of different contents of nanocellulose on the performance of cement-based materials is analyzed.The results show that appropriate contents of nanocellulose(0.1%~0.15%)can significantly improve the compressive strength and flexural strength of cement.The compressive strength of cement increases by 28.9%when the nanocellulose content is 0.15%.In addition,nanocellulose significantly enhances the freeze-thaw resistance of cement.When the nanocellulose content is 0.15%,the mass loss rate of the specimens is reduced to 0.994%after 200 cycles of freeze-thaw.The chloride ion diffusion coefficient of the cement matrix is significantly reduced after adding 0.1%~0.15%nanocellulose,showing better resistance to chloride ion corrosion.The addition of 0.15%nanocellulose also has a good improvement in the resistance to carbonation of ordinary Portland cement.This study shows that as an effective modifier for cement-based composite materials,nanocellulose can significantly improving their mechanical properties and durability.