氧化石墨烯水泥浆体流变性能的定量化研究

王琴; 王健; 吕春祥; 崔鑫有; 李时雨; 王皙

doi:10.1016/S1872-5805(16)60033-1

氧化石墨烯水泥浆体流变性能的定量化研究

doi: 10.1016/S1872-5805(16)60033-1

1.
北京建筑大学土木与交通工程学院工程结构与新材料北京市高校工程研究中心绿色建筑与节能技术北京市重点实验室, 北京 100044;
2.
中国科学院山西煤炭化学研究所碳纤维制备技术国家工程实验室, 山西太原 030001

基金项目: 国家自然科学基金（51508020）；北京市教育委员会基金资助项目（KM201510016003）；北京高校创新团队建设与教师职业发展计划项目（IDHT2013）.

详细信息

通讯作者:
王琴,讲师.E-mail:wangqin@bucea.edu.cn

中图分类号: TB321
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- 被引次数: 0
出版历程
- 收稿日期: 2016-08-15
- 录用日期: 2016-12-26
- 修回日期: 2016-12-10
- 刊出日期: 2016-12-28

Rheological behavior of fresh cement pastes with a graphene oxide additive

1.
Beijing Key Laboratory of Green Building and Energy Efficiency Technology, Beijing College Engineering Research Centre of Engineering Structure and New Material, Beijing University of Civil Engineering and Architecture, Beijing 100044, China;
2.
National Engineering Laboratory for Carbon Fiber Technology, Institute of Coal Chemistry, Chinese Academy of Sciences, Taiyuan 030001, China

Funds: National Natural Sciences Foundation of China (51508020); Beijing Educational Commission (KM201510016003); Beijing College Innovation Team-building and Teacher Career Development Project (IDHT2013).

摘要

摘要: 采用流变仪和激光共聚焦显微镜对不同氧化石墨烯（GO）掺量的新拌水泥浆体的流变参数以及浆体微观形态进行了定量化研究，并采用Modified-Bingham（M-B）模型和Herschel-Bulkley（H-B）模型对所测数据进行了拟合处理，提出了GO影响新拌水泥浆体的作用机理。结果表明，GO的掺入可以使新拌浆体中在减水剂作用下分散的水泥颗粒发生再次凝聚，形成重组絮凝结构，且随着GO掺量的增加，重组絮凝结构的数量越多，从而使得浆体流变性发生显著变化。一方面，新拌浆体的塑性粘度、屈服应力以及触变性随GO掺量的提高而显著增加。另一方面，GO的掺入提高了新拌浆体的临界剪切速率，使其在较大剪切速率下的流变行为仍然表现为剪切变稀；降低了浆体的剪切增稠程度，提高了浆体的稳定性。
- 氧化石墨烯 /
- 水泥浆体 /
- 流变性能 /
- 絮凝结构
Abstract: The rheological properties and morphology of fresh cement pastes with different contents of graphene oxide (GO) were investigated by a rheometer and a laser confocal scanning microscope, respectively. The rheological data were fitted by the Modified-Bingham (M-B) model and Herschel-Bulkley (H-B) model. A mechanism for the effect of GO on the rheological properties is proposed. Results show that the cement particles are re-agglomerated and new flocculation structures are generated by the addition of GO. The new flocculation structures significantly alter the rheological properties of the pastes. The degree of re-agglomeration and the number of new flocculation structures increase with increasing GO content, leading to a sharp increase in the yield stress, plastic viscosity and the area of the hysteresis loop. GO can effectively reduce the degree of shear-thickening, and increase the critical shear rate and the stability of the pastes.
- Graphene oxide /
- Cement paste /
- Rheological property /
- Flocculation structure

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