收稿日期: 2023-01-31
网络出版日期: 2023-11-16
基金资助
国网江苏省电力有限公司科技项目(J2022080)
Study on dispersion of silica fume/graphene oxide in hardened cement paste
Received date: 2023-01-31
Online published: 2023-11-16
氧化石墨烯用作水泥增强材料的研究已取得一定进展，而硅灰通常用作水泥掺合料。已有研究报道了利用硅灰/氧化石墨烯复合材料制备水泥基材料，但硅灰辅助分散氧化石墨烯的理论研究尚不完善。基于此，采用超声法制备不同掺量的硅灰/氧化石墨烯混合悬浮液，分析了该悬浮液在水泥孔隙液中的分散性，并制备了硅灰/氧化石墨烯水泥硬化浆体。结果表明：硅灰在水泥孔隙溶液中剥离了氧化石墨烯片层，改善了氧化石墨烯的分散稳定性；当m（氧化石墨烯）/m（水泥）为0.25%、m（硅灰）/m（水泥）为10%时，水泥水化28 d抗折、抗压强度分别可达12.3 MPa和73.2 MPa，相较于不掺硅灰的样品分别提高了48.19%和18.06%。硅灰在水泥复合材料中发挥了双重作用，一方面与Ca（OH）2反应，避免了水化解离出来的Ca2+争夺氧化石墨烯；另一方面作为填料填充C—S—H凝胶空隙，提高了水泥内部致密性。
杜长青 , 王章轩 , 仝腾 , 刘骁繁 , 刘亮 . 硅灰/氧化石墨烯在水泥硬化浆体中的分散性研究[J]. 无机盐工业, 2023 , 55(11) : 115 -120 . DOI: 10.19964/j.issn.1006-4990.2023-0045
The research of graphene oxide（GO） as cement reinforcing material has made some progress，and silica fume（SF） is commonly used as cement admixture.It has been reported that SF/GO is compounded to prepare cement-based materials，but the theoretical study of SF-assisted dispersion of GO remains incomplete.Consequently，different dosage of SF/GO suspension was prepared by ultrasonic method，the dispersibility of the suspension in cement pore solution was analyzed.SF/GO hardened cement paste was also prepared.The results of microscopic analysis indicated that SF stripped the GO sheets in cement pore solution，the dispersion and stability of GO were improved.When m（GO）/m（cement） was 0.25% and m（SF）/m（cement） was 10%，the 28 d flexural and compressive strength of the composites were 12.3 MPa and 73.2 MPa，respectively，which were increased by 48.19% and 18.06% compared to the sample without SF.SF served a dual purpose in the cement composites by reacting with Ca（OH）2 to avoid competition for GO from Ca2+ dissociated by hydration，and by filling gaps in the C—S—H structure to improve the composites′ internal density.
Key words： graphene oxide; silica fume; cement; dispersity; cement pore solution
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