【摘要】 为解决固体废料堆积和二氧化碳排放问题，并提高超细矿物掺合料(UMA)和玄武岩纤维(BF)的利用率，本研究探讨了超细粉煤灰(UFA)、超细矿渣(US)与玄武岩纤维(BF)协同改性高强混凝土(HPC)的可行性。利用响应曲面法(RSM)中的Box-Behnken(BBD)为设计基础，系统地优化了UFA取代率、US取代率和BF体积掺量对高强混凝土(HPC)工作性能(坍落度)和力学性能(28 d抗压强度及劈裂抗拉强度)的影响，确保其高流动性，建立了可靠的预测模型(R~2>0.97),最终优化并验证了UFA的最佳替代量为24wt%,US的最佳替代率为16wt%,BF最佳掺入量为0.10vol%。在此条件下，HPC坍落度为195 mm, 28 d抗压强度为69.62 MPa, 28 d劈裂抗拉强度为6.79 MPa,试验值与预测值误差均小于10%,模型精度良好。研究表明，RSM可有效优化UMABFHPC的配合比，UFA-US-BF三元体系通过物理填充、火山灰反应与纤维桥联的协同作用，显著提升了混凝土的性能。本研究为固废高值化利用与低碳混凝土的精准设计提供了理论依据和实践方案。更多还原

【Abstract】 To address the issues of solid waste accumulation and carbon dioxide emissions and to enhance the utilization of ultrafine mineral admixtures(UMA) and basalt fiber(BF),this study investigates the synergistic modification of high-strength concrete(HPC) using ultrafine fly ash(UFA),ultrafine slag(US),and basalt fiber(BF).Based on the Box-Behnken design(BBD) within the response surface methodology(RSM),the effects of UFA replacement rate,US replacement rate,and BF volume fraction on the workability(slump) and mechanical properties(28-day compressive strength and splitting tensile strength) of HPC were systematically optimized,ensuring high fluidity.Reliable predictive models were established(R~2>0.97),and the optimal mix proportions were determined and validated:UFA replacement rate of24wt%,US replacement rate of 16wt%,and BF volume fraction of 0.10vol%.Under these conditions,the slump reached 195 mm,the 28-day compressive strength was 69.62 MPa,and the 28-day splitting tensile strength was 6.79 MPa.The deviations between experimental and predicted values were all less than 10%,indicating good model accuracy.The results demonstrate that RSM can effectively optimize the mix design of UMABF-modified HPC.The ternary UFA-US-BF system significantly improves concrete performance through synergistic effects of physical filling,pozzolanic reaction,and fiber bridging.This research provides a theoretical basis and practical approach for high-value utilization of solid waste and precise design of low-carbon concrete.更多还原