摘要
采用超声分散法将氧化石墨烯(GO)按不同复配比例分散在2种不同聚羧酸减水剂(PC)中,制得改性减水剂(GO/PCs),研究GO/PCs复合物对水泥净浆流变性能及水化热的影响。结果表明,减水型GO/PCs复合物掺量在0.5‰~1.0‰范围时,增加掺量会加剧水泥浆体剪切增稠现象,增大屈服应力和塑性黏度,掺量在1.0‰~1.5‰范围时,增加掺量的作用效果相反;保坍型GO/PCs复合物的临界掺量为2.0‰。GO可延长诱导期,对水泥水化具有缓凝作用,但对72 h水化总放热量影响不大。
In this paper,graphene oxide(GO)was dispersed in two different polycarboxylate superplasticizers(PC)by the ultrasonic dispersion method,called GO/PCs.The effects of GO/PCs composites on rheological properties and hydration heat of cement paste were studied.The results show that when the dosage of water reducing GO/PCs composites is 0.5‰-1.0‰,increasing the dosage will aggravate the shear thickening phenomenon of cement paste,increase the yield stress and plastic viscosity;when the dosage is 1.0‰-1.5‰,increasing the dosage has the opposite effect;the critical dosage of slump retaining GO/PCs composites is 2.0‰.GO can retard the hydration of cement and prolong the hydration induction period,but it has little effect on the total heat release of 72 h.
作者
童斌
宋旭艳
李东旭
张霄涵
郜志海
Tong Bin;Song Xuyan;Li Dongxu;Zhang Xiaohan;Gao Zhihai(College of Civil Engineering,Suzhou University of Science and Technology,Suzhou,Jiangsu 215011;College of Materials Science and Engineering,Nanjing University of Technology,Nanjing,Jiangsu 211816)
出处
《非金属矿》
CSCD
北大核心
2021年第5期31-35,共5页
Non-Metallic Mines
基金
国家自然科学基金(51872137)
广东省滨海土木工程耐久性重点实验室开放基金(GDDCE18-15)
2020年苏州市建设科研项目(苏住建科[2020]3号)。
关键词
氧化石墨烯
流变模型
黏度
屈服应力
水化热
graphene oxide
rheological model
viscosity
yield stress
heat of hydration
