Abstract
In order to solve the problem of the recycling utilization about an industry waste solid-red mud, a kind of geopolymer material system based on red mud-fly ash-carbide slag has been developed. The microstructure and composition of the geopolymer material system at the age of 28 days was tested by the scanning electron microscope (SEM), energy dispersive X-ray spectroscopy (EDS) and X-ray diffraction (XRD). It was showed that the compressive strength of the geopolymer sample was 15.1 MPa when the liquid solid ratio (L/S) was 0.7, sand-binder ratio was 3:1, alkaline activator used carbide slag, and the fly ash, red mud and carbide slag were prepared as the proportion of 4:3:3. Through SEM-EDS and XRD results, the spherical beads in fly ash were dissolved in the alkaline environment to form silicon and aluminum monomers. Carbide slag played the roles of calcium component support in C-A-S-H, C-S-H gels and alkaline activator.
Highlights
Portland cement consumes a lot of mineral resources and energy during the production process and brings dust and noise pollution (Song et al, 2019)
The compressive strength of geopolymers samples cured for 28 days under the ratio of D2 group can reach 15.1 MPa, and the flexural strength of geopolymer samples can reach 1.79 MPa
The purpose of this study was to verify the feasibility of preparing fly ash based geopolymers activated by red mud and carbide slag, and to test its crucial performance, including micro-feature and mechanical characteristics
Summary
Portland cement consumes a lot of mineral resources and energy during the production process and brings dust and noise pollution (Song et al, 2019). Geopolymer is a kind of amorphous aluminium-oxygen-silicate network material formed by mineral condensation of silica-alumina inorganic materials, which is primarily composed of ionic bond and covalent bond, supplemented by Van der Waals bond. Due to their high mechanical properties and environmental benefit, geopolymer appears as a future prospective construction material and have applications in different areas (Singh and Middendorf, 2020). Class F fly ash is one of the main raw materials for the preparation of geopolymer, mainly contains spherical beads, which can form silicon and aluminum monomers under alkaline activators, and forms a gel network through geopolymerization by sharing oxygen atoms (Vu et al, 2020)
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