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<p>The CO<sub>2</sub> foam cement slurry suffers from limitations such as poor flowability, unclear optimal mix ratios, and unstable foam properties. This study investigates the effects of surfactant, water-to-cement ratio, foam-to-slurry ratio, and NS-Q content on CO<sub>2</sub> foamed cement slurry through orthogonal experiments and range analysis. The results showed that the best foam liquid combination was 2.19&#xa0;g/L A1214, 1.81&#xa0;g/L S, and 3&#xa0;g/L nanomaterial NS-S. The initial optimal water/cement ratio for CO<sub>2</sub> foam cement slurry was determined to be 1:2.4, with the optimal foam/slurry ratio of 4:1. The best addition of NS-Q in the foam cement slurry was found to be 1%. The 28-day compressive strength of CO<sub>2</sub>-NSQ foam cement slurry was 2.6 times higher than that of ordinary air foam cement slurry, with a more significant early strength increase of 25% compared to CO<sub>2</sub> foam cement slurry without NSQ. However, the density showed only a slight increase. Moreover, the cost of 3-day compressive strength for CO<sub>2</sub>-NSQ foam cement slurry was 206.76 RMB lower than that of ordinary cement slurry. In conclusion, CO2-NSQ foam cement slurry is of great significance in achieving carbon neutrality goals and enhancing foam concrete performance.</p>

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Research on Modification of Foamed Cement Slurry by CO2 and NS-Q

  • 期刊论文

  • 发表日期：

    2025年12月20日

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  • Tugen Feng,
  • Jun Pan,
  • Jian Zhang,
  • Zhiping Li,
  • Cheng Zhu

摘要

The CO2 foam cement slurry suffers from limitations such as poor flowability, unclear optimal mix ratios, and unstable foam properties. This study investigates the effects of surfactant, water-to-cement ratio, foam-to-slurry ratio, and NS-Q content on CO2 foamed cement slurry through orthogonal experiments and range analysis. The results showed that the best foam liquid combination was 2.19 g/L A1214, 1.81 g/L S, and 3 g/L nanomaterial NS-S. The initial optimal water/cement ratio for CO2 foam cement slurry was determined to be 1:2.4, with the optimal foam/slurry ratio of 4:1. The best addition of NS-Q in the foam cement slurry was found to be 1%. The 28-day compressive strength of CO2-NSQ foam cement slurry was 2.6 times higher than that of ordinary air foam cement slurry, with a more significant early strength increase of 25% compared to CO2 foam cement slurry without NSQ. However, the density showed only a slight increase. Moreover, the cost of 3-day compressive strength for CO2-NSQ foam cement slurry was 206.76 RMB lower than that of ordinary cement slurry. In conclusion, CO2-NSQ foam cement slurry is of great significance in achieving carbon neutrality goals and enhancing foam concrete performance.