Mechanical properties and mechanisms of alkali-activated slag paste reinforced by graphene oxide-SiO2 composite
Journal article, 2022

Alkali-activated slag (AAS) binders-based composites are considered potential alternatives to conventional cement-based composites. However, the quasi-brittle mechanical behavior of AAS binders-based composites limits their widespread application. In this study, a graphene oxide-SiO2 (GO-SiO2) composite was produced to address this issue. The experimental results showed that the flexural strength of an AAS paste increased by 133.2% with 1.5 wt% GO-SiO2 composite, and its corresponding flexural-to-compressive strength ratio increased 95% i.e. from 0.063 to 0.123. To explore the strengthening mechanism, the stability of the GO-SiO2 composite in alkaline solutions and the dispersion effect of GO-SiO2 composite on the mechanical properties of AAS paste were investigated. The experimental results showed that the prepared GO-SiO2 composite had stable C–O–Si chemical bonds connected GO with hydration products, thereby improving the strength of the AAS paste. The molecular dynamics study revealed the mechanism that the high-dispersed GO-SiO2 composite could improve the mechanical properties of the AAS paste dramatically.

Mechanical properties

Alkali-activated slag paste

Strengthening mechanism

Graphene oxide-SiO 2

Molecular dynamics


Haibin Yang

Shenzhen University

Dongshuai Hou

Qingdao University of Science and Technology

Dapeng Zheng

Shenzhen University

Luping Tang

Chalmers, Architecture and Civil Engineering, Building Technology

Waiching Tang

University of Newcastle

Hongzhi Cui

Shenzhen University

Journal of Cleaner Production

0959-6526 (ISSN)

Vol. 378 134502

Subject Categories

Polymer Technologies

Other Chemistry Topics

Composite Science and Engineering



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