Enhancing the pozzolanic effect and mechanical properties of fly ash cement using graphene oxide
Source abstract
Abstract
The incorporation of fly ash (FA) as an admixture to partially replace cement clinker can improve the strength of cement pastes. However, the addition of FA leads to weak early-age mechanical strength. Graphene oxide (GO) is an ideal two-dimensional material that can be functionalised on FA surfaces and accelerates cement hydration kinetics through oxygen-containing group-mediated Ca2+adsorption, which synergistically enhances the dissolution of FA and subsequent pozzolanic reactions. This study clarifies the mechanism of enhancing the pozzolanic activity of FA in the cementitious system by introducing 0.05% GO. The results confirmed that the incorporation of GO significantly enhanced FA’s pozzolanic activity. In addition, both the degree of hydration and the compressive strength of the cement paste were considerably improved. The compressive strength reached 67.78 MPa at 7 days, representing an 18.58% increase compared with the control group without GO. The reduced calcium hydroxide content in hydration products indicated that the incorporating of GO in FA-blended cement enhanced the pozzolanic reaction of FA, thereby promoting secondary hydration of the FA.
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Research context
OpenAlex topics: Concrete and Cement Materials Research · Innovative concrete reinforcement materials · Concrete Properties and Behavior
SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.
Affiliations
University of Jinan Shandong Provincial Key Laboratory of Green and Intelligent Building Materials, , Jinan,
Funding
National Key Research and Development Program of China · National Natural Science Foundation of China · Taishan Scholars Program · Science Foundation for Excellent Young Scholars of Shandong Province · Jinan's ‘One Matter, One Discussion’ Top Talent Program, 111 Project · Annual New Talent Research Program (Natural Sciences) – Young Talent Project, University of Jinan
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