氧化石墨烯对水泥基复合材料微观结构和力学性能的影响

王琴; 王健; 吕春祥; 刘伯伟; 张昆; 李崇智

doi:10.1016/S1872-5805(15)60194-9

氧化石墨烯对水泥基复合材料微观结构和力学性能的影响

doi: 10.1016/S1872-5805(15)60194-9

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: 北京市教委基金(KM201510016003); 北京高校创新团队建设与教师职业发展计划项目(IDHT2013);国家自然科学基金(51408622);北京市自然科学基金(8144043).

详细信息

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

中图分类号: TB332
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出版历程
- 收稿日期: 2015-04-20
- 录用日期: 2015-09-07
- 修回日期: 2015-08-01
- 刊出日期: 2015-08-28

Influence of graphene oxide additions on the microstructure and mechanical strength of cement

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 of Preparation Technology of Carbon Fiber, Institute of Coal Chemistry, Chinese Academy of Sciences, Taiyuan 030001, China

Funds: Beijing Municipal Commission of Education(KM201510016003); Beijing College Innovation Team-building and Teacher Career Development Project (IDHT2013); State Natural Sciences Foundation (51408622); Beijing Natural Sciences Foundation (8144043).

摘要

摘要: 研究了不同掺量下氧化石墨烯(GO)对水泥石以及胶砂微观结构和力学性能的影响。含16.5%水的水泥浆、0.05%GO及3倍于水泥的沙子共混物作为添加剂制备成砂浆。通过SEM、液氮吸附仪和一系列标准实验分别对水泥石的微观形态、孔隙结构、抗压抗折强度以及水泥净浆的流动度、黏度、凝结时间进行表征;考察不同GO掺量下水泥水化放热的变化情况。结果表明:GO对水泥浆有显著增稠和促凝作用;GO的掺入可以有效降低水泥的水化放热量;GO对水泥石有显著的增强增韧效果,28天龄期时,GO质量分数为0.05%的水泥石,3、7和28 d抗压强度和抗折强度同比对照组分别增加52.4%、46.5%、40.4%和86.1%、68.5%、90.5%,胶砂的抗压强度和抗折强度同比对照组分别增加43.2%、33%、24.4%和69.4%、106.4%、70.5%;GO在水泥硬化过程中对水泥石中晶体产物的产生有促进作用并能规整晶体的排布而形成针状晶体簇,改善水泥石中的孔结构,降低水泥石中微孔的体积,增加水泥石的密实度,对水泥石有显著地增强增韧效果。
- 氧化石墨烯 /
- 水泥基复合材料 /
- 增强增韧 /
- 微观结构 /
- 水泥水化热
Abstract: The effect of adding graphene oxide (GO) to cement on its microstructure and mechanical strength was investigated. A paste of cement (16.5% of water)and GO (0.05%) was prepared together with an identical mixture to which sand (3x the weight of the cement) had been added to form a mortar. The fluidity, viscosity and setting time of the mortar and the morphology, pore structure and compressive and flexural strengths of both the hardened cement paste and mortar, were investigated using SEM, nitrogen adsorption, and fluidity, viscosity, mechanical and hydration tests. The influence of the GO addition on the hydration heat of the cement was also tested. Results show that the addition of GO increases the viscosity, decreases the fluidity and shortens the setting time of the mortar. It also reduces the heat of hydration of the cement. The compressive and flexural strengths of the hardened cement paste at different times are increased by the addition of GO. The flexural strength was greater by 86.1%, 68.5% and 90.5% after 3, 7 and 28 days, respectively, and the corresponding compressive strength increases were 52.4%, 46.5% and 40.4% For the hardened mortar, the corresponding increases are 69.4%, 106.4% and 70.5% for flexural strength and 43.2%, 33% and 24.4% for compressive strength. The addition of GO promotes hydration, decreases pore volume, accelerates crystallite formation and causes the crystallites to align, which increases the tightness of both the hardened cement paste and mortar.
- Graphene oxide /
- Cement composites /
- Reinforcing and toughening /
- Microstructure /
- Hydration heat

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