氧化石墨烯改性水泥砂浆力学性能及微观机理研究

发布时间：2018-05-08 04:31

本文选题：道路工程 + 水泥砂浆　；参考：《重庆交通大学学报(自然科学版)》2017年12期

【摘要】：采用Hummers法和超声波分散法制备氧化石墨烯(GO),并通过透射电镜、红外光谱、X射线光电子能谱等微观手段对其结构进行了表征。研究了单掺GO、同时掺加GO和聚羧酸减水剂(PC)对水泥砂浆抗折抗压强度的影响规律。结果表明:在PC存在下,GO在水泥-水体系中有较好的分散能力;复掺GO与PC后,水泥砂浆3 d和28 d抗折抗压强度比单掺GO或者单掺PC的试件的强度提高了20%以上,且早期强度提升显著。经扫面电镜(SEM)及水泥净浆孔径分析研究表明,GO能参与水泥水化过程以及对水泥水化晶体生长有模板调节作用,GO改性的水泥砂浆的C-S-H晶体可以致密整齐规整生长在GO片层上,试件内部结构更加密实,从而使GO改性水泥砂浆呈现出优异的力学性能。
[Abstract]:Graphene oxide was prepared by Hummers method and ultrasonic dispersion method. Its structure was characterized by transmission electron microscopy (TEM), X-ray photoelectron spectroscopy (XPS) and X-ray photoelectron spectroscopy (XPS). The effect of single addition of GOand go and polycarboxylic acid superplasticizer (PCP) on the flexural strength of cement mortar was studied. The results show that in the presence of PC, go has better dispersion ability in cement-water system, and the compressive strength of cement mortar at 3 d and 28 d after blending with go and PC is more than 20% higher than that of the specimen with single go or single PC. And the early strength increased significantly. SEM) and pore size analysis of cement paste show that go can participate in the hydration process of cement and the C-S-H crystal of cement mortar modified by go can grow on go layer. The internal structure of the specimens is more dense, which makes the go modified cement mortar exhibit excellent mechanical properties.
【作者单位】：重庆交通大学材料科学与工程学院;重庆欣材混凝土集团股份有限公司;
【基金】：国家自然科学基金项目(51402030) 重庆市教委科技计划项目(KJ110421;KJ130406;yjg133018) 重庆市科委基金项目(cstc2017jcyj BX0028)
【分类号】：U414

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