- Title
- Mechanical properties and mechanisms of alkali-activated slag paste reinforced by graphene oxide-SiO2 composite
- Creator
- Yang, Haibin; Hou, Dongshuai; Zheng, Dapeng; Tang, Luping; Tang, Waiching; Cui, Hongzhi
- Relation
- Journal of Cleaner Production Vol. 378, Issue 10 December 2022, no. 134502
- Publisher Link
- http://dx.doi.org/10.1016/j.jclepro.2022.134502
- Publisher
- Elsevier
- Resource Type
- journal article
- Date
- 2022
- Description
- 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.
- Subject
- alkali-activated slag paste; graphene oxide-SiO2; mechanical properties; strengthening mechanism; molecular dynamics
- Identifier
- http://hdl.handle.net/1959.13/1489229
- Identifier
- uon:52649
- Identifier
- ISSN:0959-6526
- Language
- eng
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