摘 要
高性能混凝土（HPC）因其优异的力学性能和耐久性，在现代土木工程中得到了广泛应用，但其施工过程中常因振捣不足或过振导致质量问题，因此自密实性能的研究成为关键。本研究旨在通过系统分析自密实高性能混凝土（SC-HPC）的流变特性、抗分离性和填充能力，优化其配合比设计，并探索其在实际工程中的应用效果。研究采用试验与数值模拟相结合的方法，首先基于V型漏斗试验、L型箱试验和J环试验等标准化测试手段评估混凝土的自密实性能，同时结合微观结构分析揭示浆体流动特性和骨料分布规律。进一步地，通过引入新型外加剂和矿物掺合料，优化了混凝土的粘聚性和稳定性，显著提升了其抗离析能力。研究结果表明，合理控制水胶比、砂率及外加剂掺量可有效改善SC-HPC的工作性能，使其在复杂钢筋布置条件下仍能保持良好的填充能力。此外，工程实践验证了所开发材料在桥梁、高层建筑等领域的适用性，证明其能够显著减少施工缺陷并提高工效。本研究的创新点在于提出了基于多指标综合评价的SC-HPC性能优化方法，并建立了宏观性能与微观结构之间的关联模型，为高性能混凝土的设计与应用提供了理论支持和技术指导。
关键词：自密实高性能混凝土；流变特性；抗离析性
ABSTRACT
High-performance concrete (HPC), known for its superior mechanical properties and durability, has been widely applied in modern civil engineering. However, quality issues often arise during construction due to insufficient or excessive vibration, making the study of self-compacting performance critical. This research aims to optimize the mix design of self-compacting high-performance concrete (SC-HPC) by systematically analyzing its rheological characteristics, resistance to segregation, and filling capacity, while exploring its application effects in practical engineering. A combined approach of experiments and numerical simulations was adopted. Standardized testing methods, including V-funnel tests, L-box tests, and J-ring tests, were utilized to evaluate the self-compacting properties of the concrete. Microstructural analysis was also conducted to reveal the flow characteristics of the paste and the distribution patterns of aggregates. Furthermore, the introduction of novel admixtures and mineral admixtures improved the cohesiveness and stability of the concrete, significantly enhancing its anti-segregation capability. The results indicate that appropriately controlling the water-to-binder ratio, sand ratio, and admixture dosage can effectively improve the workability of SC-HPC, ensuring good filling ability even under complex reinforcement arrangements. Additionally, engineering applications confirmed the suitability of the developed material in areas such as bridges and high-rise buildings, demonstrating its ability to reduce construction defects and increase efficiency. The innovation of this study lies in proposing a multi-indicator comprehensive evaluation method for optimizing SC-HPC performance and establishing an association model between macroscopic properties and microstructures, providing theoretical support and technical guidance for the design and application of high-performance concrete.
Keywords: Self-Compacting High-Performance Concrete; Rheological Properties; Anti-Segregation Ability
目 录
摘 要 I
ABSTRACT II
第1章 绪论 1
1.1 高性能混凝土自密实性能的研究背景 1
1.2 自密实高性能混凝土研究的意义与价值 1
1.3 国内外自密实高性能混凝土研究现状综述 2
1.4 本文研究方法与技术路线设计 2
第2章 高性能混凝土自密实性能的影响因素分析 3
2.1 自密实性能的基本原理与评价指标 3
2.2 混凝土组成材料对自密实性能的影响 3
2.3 水胶比与外加剂对自密实性能的作用机制 4
2.4 施工环境条件对自密实性能的影响研究 4
2.5 影响因素的综合分析与优化方向 5
第3章 高性能混凝土自密实性能的试验研究 6
3.1 试验方案设计与材料选择依据 6
3.2 自密实性能测试方法与设备选型 6
3.3 不同配合比条件下自密实性能的试验结果 7
3.4 外加剂种类与掺量对自密实性能的影响试验 7
3.5 试验数据分析与结论总结 8
第4章 高性能混凝土自密实性能的应用研究 9
4.1 自密实高性能混凝土在复杂结构中的应用案例 9
4.2 工程实践中自密实性能的控制要点分析 9
4.3 自密实混凝土施工工艺优化与质量保障措施 10
4.4 应用中常见问题及解决方案探讨 10
4.5 自密实高性能混凝土未来发展方向展望 11
结论 12
参考文献 13
致 谢 14
