- 目录
- 建筑石膏与胶凝材料
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纳米纤维素晶体对水泥基复合材料性能的影响研究
作者：张姣1，刘巧玲1，2，彭玉娇1，聂苗苗1，刘帅1
（1.山东建筑大学 土木工程学院，山东 济南 250101；
2.山东建筑大学 建筑结构加固与地下空间工程教育部重点实验室，山东 济南 250101）
摘要：研究了纳米纤维素晶体（CNCs）对水泥净浆流变性和水化热的影响规律，并探讨了水胶比分别为0.3、0.4、0.5时，CNCs对水泥基复合材料强度的影响，进行了微观结构分析。结果表明：CNCs的加入会延缓水泥基复合材料的早期水化，促进后期水化；CNCs可以增大水泥浆体的剪切应力和塑性黏度，且随着CNCs掺量的增加而变大；掺加CNCs可显著提高水泥砂浆的力学性能，当水胶比为0.5、CNCs掺量为0.2%时，水泥砂浆的标养28 d抗折、抗压强度较未掺CNCs的分别提高了25.4%、18.8%；CNCs改善了水泥基材料内部的微观结构，减少了其内部孔洞、裂缝等缺陷。
关键词：纳米纤维素晶体；水泥基材料；力学性能；流变特性；微观结构
中图分类号：TU525 文献标识码：A 文章编号：1001-702X（2023）01-0119-05
Effect of cellulose nanocrystals on properties of cement matrix composite
ZHANG Jiao1，LIU Qiaoling1，2，PENG Yujiao1，NIE Miaomiao1，LIU Shuai1
（1.College of Civil Engineering，Shandong Jianzhu University，Jinan 250101，China；2.Key Laboratory of Building Structural Retrofitting and Underground Space Engineering，Ministry of Education，Shandong Jianzhu University 250101，China）
Abstract：The influence law of nano cellulose crystals（CNCs） on the rheological properties and hydration heat of cement paste was explored，and the influence law of CNCs on the strength of cement-based composites when the water binder ratio was 0.3，0.4 and 0.5 respectively was discussed，and microstructure was analyzed. The results show that the addition of CNCs will delay the early hydration and promote the later hydration. It is found that CNCs can increase the yield stress and plastic viscosity of cement paste，and increase with the increase of the content of CNCs; Adding CNCs can significantly improve the mechanical properties of cement mortar. When the water binder ratio is 0.5 and the content of CNCs is 0.2%，the 28 d flexural strength and compressive strength of cement mortar are increased by 25.4% and 18.8% respectively. CNCs improve the internal microstructure of cement-based materials and reduce their internal defects such as holes and cracks.
Key words：cellulose Nanocrystals，cement based materials，mechanical property，rheological property，microstructure