- 目录
- 建筑石膏与胶凝材料
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掺氧化石墨烯水泥复合净浆的自收缩机理研究
作者：项雪萍1，李明厚2，张玉2，柴磊磊2，李贝贝2，朱朦1
（1.嘉兴南湖学院 建筑工程学院，浙江 嘉兴 314001；2.太原理工大学 土木工程学院，山西 太原 030024）
摘要：氧化石墨烯（GO）基面含有丰富的含氧官能团，同时具有较大的比表面积，可以改变水泥产物的形状及聚集形态、密实水泥基材料的微观结构、进而改善其力学性能。研究了水灰比和GO掺量对氧化石墨烯/水泥复合净浆（GO/C）自收缩特性的影响。结果表明：GO/C的自收缩受水化龄期、水灰比和GO掺量的影响较大，当水灰比为0.42、GO掺量为0.03%时，对水泥净浆自收缩的抑制作用可以达到最优，此时GO/C的28 d自收缩为1.53 mL/100 g，较对照组减小了25%。
关键词：氧化石墨烯；水泥复合净浆；自收缩；微观结构；调控机理
中图分类号：TU528.04 文献标识码：A 文章编号：1001-702X（2022）02-0023-07
Autogenous shrinkage mechanism analysis of cement-based composite paste with addition of graphene oxide
XIANG Xueping1，LI Minghou2，ZHANG Yu2，CHAI Leilei2，LI Beibei2，ZHU Meng1
（1.College of Architectural Engineering，Jiaxing Nanhu University，Jiaxing 314001，China；2.College of Civil Engineering，Taiyuan University of Technology，Taiyuan 030024，China）
Abstract：Graphene oxide（GO） has rich oxygen-containing functional groups and large specific surface area，which can change the shape and aggregation morphology of cement products，densify the microstructure of cement-based composite materials，and improve their mechanical properties. The effect of water-cement ratio and GO dosing on autogenous shrinkage properties of graphene oxide/cement composite paste（GO/C） was studied. The experimental results show that the autogenous shrinkage of GO/C is greatly
influenced by the hydration age，water-cement ratio and GO dosing. The inhibition of the autogenous-shrinkage of cement paste can reach the optimal effect when the water-cement ratio is 0.42 and the GO dosing is 0.03%. At this time，the 28 d self-shrinkage of GO/C is 1.53 mL/100 g，which is 25% smaller compared to the reference group.
Key words：graphene oxide，cement composite paste，autogenous shrinkage，microstructure，regulatory mechanism