摘要
石墨烯增强水泥基材料是目前该领域的研究热点,但石墨烯的分散性是该类研究的关键。因此,本工作采用不带羧基的羟基化石墨烯(HO-G)来研究不同掺量(0.01%、0.03%、0.05%、0.07%、0.09%,质量分数)对粉煤灰-水泥体系的工作性能、力学性能和耐久性的影响。与粉煤灰-水泥体系相比,流动度测试表明HO-G对粉煤灰-水泥砂浆新拌浆体流动度影响不大;力学性能测试表明,HO-G能增强粉煤灰-水泥砂浆的力学性能,尤其是当HO-G的掺量为0.03%时,其28 d抗折、抗压强度分别提高了12.40%和18.48%;耐硫酸盐腐蚀和抗氯离子渗透的测试结果表明,HO-G的加入还能改善粉煤灰-水泥砂浆的耐久性。微观测试表明,粉煤灰和HO-G之间存在协同效应,HO-G能加速粉煤灰的二次水化反应以促进粉煤灰-水泥体系中更多的水化晶体生成,且凭借其模板效应可进一步规整水化晶体的生长模式和调控晶体排列结构,从而改善粉煤灰-水泥基体的微观形貌。
At present, graphene reinforced cement-based materials are the research focus in this field, but the dispersion of graphene is the key of this kind of research. Therefore, in this work, the influence of different amounts (0.01wt%, 0.03wt%, 0.05wt%, 0.07wt%, 0.09wt%) of hydroxy fossil graphene (HO-G) without carboxyl group on the workability, mechanical properties and durability of fly ash-cement system was stu- died . Compared with the fly ash-cement system, the fluidity test showed that HO-G has little effect on the fluidity of the fresh fly ash-cement mortar paste. The mechanical property test showed that HO-G can enhance the mechanical properties of the fly ash-cement mortar, especially when the content of HO-G is 0.03wt%, its 28 d flexural and compressive strength increases by 12.40% and 18.48%, respectively. The test results of sulfate corrosion resistance and chloride ion penetration resistance showed that the addition of HO-G can also improve the durability of the fly ash-cement mortar. The microscopic test showed that there is a synergistic effect between fly ash and HO-G. HO-G can accelerate the secondary hydration reaction of fly ash to promote the formation of more hydrated crystals in the fly ash-cement system. With its template effect, it can further regulate the growth mode of hydrated crystals and control the crystal arrangement structure, thus improving the microscopic morphology of fly ash-cement matrix.
作者
袁小亚
蒲云东
桂尊曜
张惠一
杨森
金湛
曹蔚琦
YUAN Xiaoya;PU Yundong;GUI Zunyao;ZHANG Huiyi;YANG Sen;JIN Zhan;CAO Weiqi(School of Materials Science and Engineering,Chongqing Jiaotong University,Chongqing 400074,China;Institute of Advanced Functional Materials,Chongqing Jiaotong University,Chongqing 400074,China;Chongqing 2D Materials Institute of China,Chongqing 400714,China;School of Civil Engineering,Chongqing Jiaotong University,Chongqing 400074,China;Key Laboratory of Optoelectronic Technology&Systems Ministry of Education,Department of Optoelectronic Engineering,Chongqing University,Chongqing 401331,China)
出处
《材料导报》
EI
CAS
CSCD
北大核心
2024年第11期144-151,共8页
Materials Reports
基金
国家自然科学基金项目(51402030)
重庆市技术创新与应用发展专项重点项目(CSTB2022TIAD-KPX0031)
重庆市级引导区县科技发展专项资金(JSYY2023010)
重庆市研究生导师团队建设项目(JDDSTD2022006)
重庆交通大学校企合作项目(cqjt-2022-036)
重庆诺奖二维材料研究院科技项目(C2DMI-RD-230616-01)。
关键词
羟基化石墨烯
水泥
粉煤灰
力学性能
耐久性
hydroxylated graphene
cement
fly ash
mechanical property
durability
