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Abstract To investigate the effect of different steel slag content on properties of slag-steel slag alkali-activated composites, geopolymer-based materials with different steel slag content were synthesized using steel slag and slag as raw materials, and a water glass solution with a modulus of 1.4 as the alkali activator. The geopolymer samples doped with different steel slag ratios were analyzed using a range of techniques, including compressive strength testing, X-ray diffraction (XRD), thermal gravimetric analysis (TGA), pore structure analysis (MIP), Fourier transform infrared spectroscopy (FTIR) and scanning electron microscopy with energy-dispersive X-ray spectroscopy (SEM-EDS). The results indicated that the compressive strength of the slag-steel slag geopolymer initially increased with increasing steel slag content and then decreased, with the optimal steel slag content being 15%. The analysis results showed that at low steel slag content, the addition of steel slag facilitated the formation of amorphous gel products, which filled the pores and transformed them into smaller gel pores, thereby reducing the total porosity and enhancing the compressive strength of the samples. However, for samples with a steel slag content exceeding the optimal amount, the presence of MgO and CaO in the steel slag caused volume expansion and cracks in the sample, resulting in an increase in pore size and a decrease in compressive strength.
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Published: 01 March 2024
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2024, Vol. 0 
