Size effects of graphene oxide nanosheets on the mechanical property of cement pastes: Packing of C-S-H nanoparticles and mechanism

IF 13.1 1区工程技术 Q1 CONSTRUCTION & BUILDING TECHNOLOGY

Cement and Concrete Research Pub Date : 2025-09-17 DOI:10.1016/j.cemconres.2025.108044

Yu Zhang , Cheng Li , Shuangshuang Wang , Jing Zhong

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引用次数: 0

Abstract

The size effects of nanomaterials play a critical role in their reinforcement efficiency for polymer and metal nanocomposites, yet it has not been thoroughly demonstrated in cementitious matrices. This study systematically investigates the size effects of graphene oxide (GO) on cement hydration, microstructure, strength, and creep resistance. Compared to small-sized GO, large-sized GO (LGO) significantly enhances C-S-H packing density, hydration degree, and mechanical performance while reducing creep. These improvements stem from LGO's stronger templating effect and larger lateral size, which promote C-S-H nucleation and interparticle bonding, thus limiting C-S-H redistribution under load. Importantly, we reveal that GO enhances creep resistance not only by densifying C-S-H but also by modulating interfacial bonding in a size-dependent manner—a mechanism previously overlooked. These findings underscore the critical role of nanomaterial size effects in regulating stress transfer and microstructural evolution in cementitious systems, offering a new pathway for designing high-performance cement-based materials.

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氧化石墨烯纳米片尺寸对水泥浆力学性能的影响：C-S-H纳米颗粒的填充及其机理

纳米材料的尺寸效应对聚合物和金属纳米复合材料的增强效率起着至关重要的作用，但在胶凝基质中尚未得到充分的证明。本研究系统地研究了氧化石墨烯（GO）的尺寸对水泥水化、微观结构、强度和抗蠕变性能的影响。与小粒径氧化石墨烯相比，大粒径氧化石墨烯（LGO）显著提高了C-S-H堆积密度、水化程度和力学性能，同时降低了蠕变。这些改善源于LGO的模板效应更强，横向尺寸更大，促进了C-S-H成核和颗粒间键合，从而限制了C-S-H在载荷下的再分布。重要的是，我们发现氧化石墨烯不仅通过致密化C-S-H，还通过以尺寸依赖的方式调节界面键合来增强抗蠕变能力，这是一种以前被忽视的机制。这些发现强调了纳米材料尺寸效应在调节胶凝体系应力传递和微观结构演化中的关键作用，为设计高性能水泥基材料提供了新的途径。

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来源期刊

Cement and Concrete Research 工程技术-材料科学：综合

CiteScore

20.90

自引率

12.30%

发文量

318

审稿时长

53 days

期刊介绍： Cement and Concrete Research is dedicated to publishing top-notch research on the materials science and engineering of cement, cement composites, mortars, concrete, and related materials incorporating cement or other mineral binders. The journal prioritizes reporting significant findings in research on the properties and performance of cementitious materials. It also covers novel experimental techniques, the latest analytical and modeling methods, examination and diagnosis of actual cement and concrete structures, and the exploration of potential improvements in materials.