开发与应用

氧化石墨烯对高掺量粉煤灰水泥基材料性能的影响及机理

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  • 1.河南城建学院材料与化工学院,平顶山467036;
    2.河南理工大学,河南省深地材料科学与技术重点实验室,焦作454000
张建武(1988-),男,博士,讲师,主要从事特种水泥及水泥基材料改性研究,E-mail:20181023@hncj.edu.cn。

收稿日期: 2020-03-28

  修回日期: 2021-03-18

  网络出版日期: 2021-06-29

基金资助

河南省深地材料科学与技术重点实验室开放基金资助项目(Grant No.MDE2019-03,Henan Polytechnic University);河南省城市固废综合处置与生态利用协同创新中心开放基金(XT201904)

Influence and mechanism of GO on the property of high content fly ash cement-based material

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  • 1. School of Materials and Chemical Engineering,Henan University of Urban Construction,Pingdingshan 467036;
    2. Henan Key Laboratory of Materials on Deep-Earth Engineering,Henan Polytechnic University,Jiaozuo 454000

Received date: 2020-03-28

  Revised date: 2021-03-18

  Online published: 2021-06-29

摘要

研究了氧化石墨烯(GO)对高掺量粉煤灰水泥基材料(粉煤灰掺量50%)性能的影响。结果表明,随着GO掺量的增加,水泥基材料的凝结时间逐渐缩短。掺入1%的GO,其初凝和终凝分别缩短了50min和55min;水泥基材料的抗折强度随着GO掺量增大先增加后减小,当GO掺量为0.6%时,水泥基材料7d和28d抗折强度和抗压强度最佳,相对于空白组分别提高了34%和8.7%,但GO对水泥基材料抗压强度没有显著影响。采用XRD和SEM分析了GO作用机理,发现GO能够促进水泥矿物的早期水化反应,进而加快粉煤灰的早期火山灰反应。此外,GO还可以充当模板调控作用,生成具有花瓣状结构的水化产物。

本文引用格式

张建武, 汪潇, 李志新, 徐卓越, 金彪, 苏嘉俊, 管学茂 . 氧化石墨烯对高掺量粉煤灰水泥基材料性能的影响及机理[J]. 化工新型材料, 2021 , 49(6) : 240 -243 . DOI: 10.19817/j.cnki.issn 1006-3536.2021.06.052

Abstract

The effect of graphene oxide (GO) on the properties of high content fly ash cement-based materials (fly ash content 50%) was studied.The results shown that with the increase of GO content,the setting time of the materials was gradually shortened.When adding 1% GO,the initial setting and final setting were shortened by 50min and 30min,respectively When the GO content was 0.6%,the 7d and 28d flexural strength and compressive strength of the materials were the best,which were increased by 34% and 8.7% respectively compared with the blank group,but GO had no significant effect on the compressive strength of the materials.The mechanism of GO was analyzed by XRD and SEM.It was found that GO could promote the early hydration reaction of cement clinker minerals,and then accelerated the early pozzolanic reaction of fly ash.In addition,GO can also act as a template to generate petal like hydration products.

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