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In order to cope with climate change and achieve the goal of carbon neutrality, the use of carbonization technology to enhance the performance of cement-based materials and achieve the purpose of carb...on sequestration has become a very promising research direction. This paper considers the use of CO_2NBW as mixing water for cement-based materials, aiming to improve the carbonization efficiency of materials to achieve the goal of carbon neutrality. This time, the effect of CO_2NBW on cementitious filling materials under different aggregate fractal dimensions was studied through uniaxial compression tests and acoustic emission technology. The effect of CO_2NBW on the mechanical properties and crack evolution of the material was discussed. The results showed that CO_2 nanobubbles significantly improved the strength of cemented filling materials under different fractal dimensions, and the uniaxial compressive strength was most significantly improved by 23.04% when the fractal dimension was 2.7824. In addition, the characteristics of acoustic emission ring counts and energy parameters indicate that CO_2 nanobubbles help improve the overall pore structure of the sample, affecting the macroscopic strength. However, the addition of CO_2 nanobubbles reduces the limit energy storage ratio of elastic strain energy, which indicates that excessive CO_2 concentration may affect the hydration reaction of the cementing material.続きを見る
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