首页|氧化石墨烯对再生砂超高性能混凝土力学及抗氯离子渗透性能的影响

氧化石墨烯对再生砂超高性能混凝土力学及抗氯离子渗透性能的影响

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鉴于再生砂(RS)部分取代石英砂(QS)制备再生砂超高性能混凝土(RS-UHPC)的力学性能和耐久性降低的问题,以不同氧化石墨烯(GO)掺量为试验参数,探究GO对UHPC工作性能、力学性能及抗氯离子渗透性能的影响规律,并通过差热-热重分析和扫描电子显微镜等手段揭示其增强机理.结果表明:掺入RS会降低UHPC的流动度、力学性能及UHPC抗氯离子渗透性能;随着GO掺量的增加,RS-UHPC流动度逐渐下降,但其力学性能、抗氯离子渗透性能均显著提升,当GO质量分数为0.06%时,RS-UHPC的28 d抗压强度和抗折强度分别提升11.8%和49.6%,氯离子扩散系数降低31.8%,抗裂韧性显著提升.RS的内养护效应和GO的晶核效应均促进水泥水化、降低基体孔隙率、改善再生砂与基体的界面过渡区,从而提升RS-UHPC的力学性能、抗裂性能和抗氯离子渗透性能.
Effects of graphene oxide on mechanical properties and chloride penetration resistance of ultra-high performance concrete incorporating recycled sand
In view of the problems of mechanical properties and durability of recycled sand(RS)partially replacing quartz sand(QS)in the preparation of recycled sand ultra-high performance concrete(RS-UHPC),different dosages of graphene oxide(GO)were used as experimental parameters to explore the influence of GO on the working performance,mechanical properties,and chloride ion penetration resistance of UHPC,and to reveal its reinforcement mechanism through TG-DSC and SEM methods.The results showed that the addition of RS could reduce the flowability and mechanical properties of UHPC,as well as its resistance to chloride ion penetration.As the GO content increased,the flowability of RS-UHPC was further decreased,but its mechanical properties and resistance to chloride ion penetration were significantly improved.When the GO content was 0.06%,the 28 d compressive strength and flexural strength of RS-UHPC were increased by 11.8%and 49.6%,respectively.The chloride ion diffusion coefficient was decreased by 31.8%,and the crack toughness was significantly improved.The internal curing effect of RS and the nucleation effect of GO both promoted cement hydration,re-duced matrix porosity,improved the interface transition zone between recycled sand and matrix,thereby enhancing the me-chanical properties,crack resistance,and chloride ion penetration resistance of RS-UHPC.

ultra-high performance concretegraphene oxiderecycled sandmechanical propertiesinterface transition zone

张瑞君、陈国良、宋春草、朱亚飞

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郑州工商学院工学院,河南郑州 450045

河南豫之筑建设工程有限公司,河南郑州 450045

合肥工业大学土木与水利工程学院,安徽合肥 230009

超高性能混凝土 氧化石墨烯 再生砂 力学性能 界面过渡区

河南省重点研发与推广专项

212102110191

2024

无机盐工业
中海油天津化工研究设计院 中国化工学会无机酸碱盐专业委员会

无机盐工业

CSTPCD北大核心
影响因子:0.489
ISSN:1006-4990
年,卷(期):2024.56(8)
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