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聚羧酸改性氧化石墨烯对水泥基材料性能的影响

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将氧化石墨烯(GO)表面活化后接枝共聚丙烯酸和异戊烯醇聚氧乙烯醚,制备聚羧酸改性氧化石墨烯(GO-PCE).通过红外光谱和热重分析确定了GO-PCE的分子结构,并测试了掺GO-PCE水泥净浆和砂浆的性能.结果表明:掺入适量的GO-PCE能明显改善水泥净浆的工作性,当GO-PCE掺量为0.03%时,比掺GO的水泥净浆流动度增大102.86%;当GO-PCE掺量为0.03%、0.05%时,砂浆的28 d抗压强度比掺GO的分别提高17.95%、19.44%;GO-PCE在水泥浆体中的分散性优于GO,能充分发挥GO片层的增强性能,且GO-PCE可以加速水泥的水化进程,促进水化产物成核生长,细化氢氧化钙晶体尺寸,使水泥基体结构更致密.
Effect of polycarboxylic acid modified graphene oxide on properties of cement-based materials
Polycarboxylic acid modified graphene oxide composite(GO-PCE)was prepared by surface activation of graphene oxide(GO)and grafting copolyacrylic acid and isoprenol polyoxyethylene ether.The molecular structure of GO-PCE was determined by infrared spectrum and thermogravimetric analysis,and the properties of GO-PCE doped cement paste and mortar were tested.The results show that proper amount of GO-PCE can obviously improve the workability of cement paste.When the content is 0.03%,the fluidity of cement paste increases by 102.86%compared with that of GO.When the GO-PCE content is 0.03%and 0.05%,the 28 d compressive strength of mortar is increased by 17.95%and 19.44%,respectively.The dispersion of GO-PCE was better than that of GO in the cement paste,resulting in the enhancement performance of GO lamellae could be effectively exerted,the hydration process was accelerated to promote the growth of nucleation of hydration products,and the size of the calcium hy-droxide crystals was further refined to make the structure of the cement matrix denser.

graphene oxidepolycarboxylic acidmodifiedfluiditystrength

赵文静、周冰洁、刘晓、李雨洋、韩康、刘爽、杨仁和

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北京建筑材料科学研究总院有限公司,固废资源化利用与节能建材国家重点实验室,北京 100041

北京工业大学材料科学与工程学院,北京 100124

氧化石墨烯 聚羧酸 改性 流动度 强度

北京金隅集团2022年揭榜挂帅项目

B20224006

2024

新型建筑材料
中国新型建筑材料工业杭州设计研究院

新型建筑材料

CSTPCD
影响因子:0.569
ISSN:1001-702X
年,卷(期):2024.51(9)