1.长安大学;2.北京首钢矿山建设工程有限责任公司;3.中铁一局集团物资工贸有限公司
国家自然科学基金项目(52479115)；陕西省重点研发计划项目(2024SF-YBXM-615)；中央高校基本科研业务费专项资金—长安大学优秀博士学位论文培育资助项目(300102283721)；陕西高校青年创新团队([2022]943)
1.Chang'2.'3.an University;4.Beijing Shougang Mining Construction Co., LTD;5.Materials Supply and Industry Trade Co. Ltd. of China Railway First Group
National Natural Science Foundationof China (Grant No. 52479115); Key Research and Development Program of Shaanxi (Grant No. 2024SF-YBXM-615); Fundamental Research Funds for the Central Universities, CHD (Grant No. 300102283721); Youth Innovation Team of Shaanxi Universities (Grant No. 2022943)
采用单纯形质心设计方法研究了CO2拌合对钢渣-粉煤灰混凝土性能的影响规律.研究发现，CO2拌合降低了混凝土坍落度，但通过优化钢渣和粉煤灰掺量可改善其流动性.早期水化阶段，CO2拌合加剧了粉煤灰对抗压强度的不利影响；后期阶段，增加粉煤灰掺量导致强度持续下降，而增加钢渣掺量则可以提高强度.微观分析表明，高钢渣掺量体系生成高密度方解石，改善了结构致密性；高粉煤灰掺量体系则生成低密度文石.
This study employed the simplex-centroid mixture design method to investigate the effects of CO2 mixing mineralization on steel slag (SS)-fly ash (FA) concrete properties. Results indicated that while CO2 mixing significantly reduced concrete slump, incorporating appropriate amounts of SS and FA improved its flowability. During early hydration, CO2 mixing intensified the adverse effects of FA while mitigating the negative effect of SS. In later stages, increasing FA content led to continuous strength reduction. Microstructural analysis revealed that systems with high SS content form high-density calcite, improving structural density, while systems with high FA content produce low-density aragonite.
