无机盐工业
主管:中海油天津化工研究设计院有限公司
主办:中海油天津化工研究设计院有限公司
   中海油炼油化工科学研究院(北京)有限公司
   中国化工学会无机酸碱盐专业委员会
ISSN 1006-4990 CN 12-1069/TQ

无机盐工业 ›› 2023, Vol. 55 ›› Issue (11): 115-120.doi: 10.19964/j.issn.1006-4990.2023-0045

• 环境·健康·安全 • 上一篇    下一篇

硅灰/氧化石墨烯在水泥硬化浆体中的分散性研究

杜长青1(), 王章轩1, 仝腾2, 刘骁繁1, 刘亮1   

  1. 1.国网江苏省电力有限公司建设分公司,江苏 南京 210011
    2.东南大学土木工程学院,江苏 南京 210096
  • 收稿日期:2023-01-31 出版日期:2023-11-10 发布日期:2023-11-16
  • 作者简介:杜长青(1984— ),男,硕士,高级工程师,主要研究方向为土木工程;E-mail:shs1233@163.com
  • 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

DU Changqing1(), WANG Zhangxuan1, TONG Teng2, LIU Xiaofan1, LIU Liang1   

  1. 1.Construction Branch of State Grid Jiangsu Electric Power Co.,Ltd.,Nanjing 210011,China
    2.School of Civil Engineering,Southeast University,Nanjing 210096,China
  • Received:2023-01-31 Published:2023-11-10 Online:2023-11-16

摘要:

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。

关键词: 氧化石墨烯, 硅灰, 水泥, 分散性, 水泥孔隙溶液

Abstract:

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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