A review of recycled aggregate concrete modified by nanosilica and graphene oxide: Materials, performances and mechanism

To offset the shortcomings of recycled aggregate concrete (RAC) made from recycled aggregates, the application of nano-materials has been proved as an innovative and highly efficient strategy. This paper first discusses basic physiochemical properties and dispersibility of two typical nano-materials...

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Bibliographic Details
Published in:Journal of cleaner production 2022-11, Vol.375, p.134116, Article 134116
Main Authors: Zhan, Peimin, Xu, Jing, Wang, Juan, Zuo, Junqing, He, Zhihai
Format: Article
Language:English
Subjects:
Durability
Interface transition zone
Mechanical property
Nano-materials
Recycled aggregate concrete
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Summary:To offset the shortcomings of recycled aggregate concrete (RAC) made from recycled aggregates, the application of nano-materials has been proved as an innovative and highly efficient strategy. This paper first discusses basic physiochemical properties and dispersibility of two typical nano-materials including nanosilica and graphene oxide, and then comprehensively reviews how the presence and modification approaches of these nano-materials affect the performances of RAC, such as workability, mechanical properties, durability, and dimensional stability. In particular, the effects of nano-modification on the interfacial transition zone (ITZ) are highlighted in microstructural studies. The literature survey reveals that the incorporation of nano-materials generally reduces the workability of RAC, promotes the hydration process of cement, and improves the mechanical properties and durability of RAC. Nevertheless, some controversies remain as the modification effects of nano-materials are highly dependent on the types, dosages, and modification approaches of nano-materials. The mechanism of nano-modification in RAC is attributed mainly to the nucleation effect, filling effect, pozzolanic effect, bridging effect, as well as the enhancement of the ITZs by the above mentioned effects. Finally, the application of nano-materials in RAC is briefly assessed by the economic and environmental aspects. This review offers an insight into an in-depth understanding of the production, performances, and potential future utilization of nano-modified RAC. [Display omitted]
ISSN:0959-6526
1879-1786
DOI:10.1016/j.jclepro.2022.134116