首先，通过试验分析了桥梁桩基高性能混凝土的力学性能，选择了试验材料，确定了高性能混凝土抗拉试验的方法。讨论了粉煤、矿渣和硅灰对高性能混凝土强度的影响，研究了不同龄期高性能混凝土抗压强度随粉煤灰掺量、矿渣掺量以及硅灰掺量的变化规律。同时研究了研究了矿渣对高性能混凝土强度的影响，复掺粉煤灰和硅灰对高性能混凝土抗压强度的影响，并且总结相关规律。
其次，进行了桥梁桩基高性能混凝土的早期自收缩机理研究。首先，定性的分析了高性能混凝土自收缩机理，研究了理论模型；然后，设计了高性能混凝土早期收缩试验方案，提出了试验处理方法；接着，分析了影响桥梁桩基高性能混凝土的主要因素；最后，讨论了桥梁桩基高性能混凝土早期收缩的试验结果，总结了粉煤灰、硅灰以及复掺粉煤灰和硅灰对高性能混凝土早期自收缩的影响规律。
最后，进行了桥梁桩基高性能混凝土的抗裂机理研究。首先，分析了高性能混凝土开裂机理，分析了影响高性能混凝土开裂的主要因素。其次，设计了高性能混凝土抗裂性能测试试验方法，然后，讨论了粉煤灰和硅灰对高性能混凝土的抗裂性能的影响规律；最后，讨论了提高桥梁桩基高性能混凝土施工质量的措施。
关键词：桥梁桩基；高性能混凝土；早期收缩；抗裂机理
Abstract
Concrete technology continues to improve, and promote the rapid development of large span bridge, the bridge pile foundation is an important part of large spans bridge, can effectively improve the seismic performance of the bridge. With the rapid development of concrete technology, the concrete strength is increasing, the high performance concrete also appears continuously, and has been applied in bridge foundation. In order to improve the durability of bridge pile foundation for bridge, improves the service life, guarantee people's safety, in-depth study of bridge pile foundation of high performance concrete shrinkage and crack resistance, shrinkage and crack mechanism of concrete is proposed to seek, impervious and anti crack measures of concrete, enhance the performance of concrete and strength, so as to ensure the safety and durability of bridge pile foundation.
Firstly, the mechanical properties of high performance concrete of bridge pile foundation were analyzed through test, the test material, the method of determining the tensile test of high performance concrete. The effect of powder coal, slag and silica fume on the strength of high performance concrete discussion, of high performance concrete compressive strength at different ages as the amount of fly ash, slag and silica fume quantity changes. The influence of slag on the strength of high performance concrete, influence of fly ash and silica fume on the compressive strength of high performance concrete, and summarizes the related rules.Secondly, study on premature shrinkage mechanism of early of bridge pile foundation of high performance concrete. First of all, the qualitative analysis of the mechanism of premature shrinkage of high performance concrete, studies the theory model; then, the experiment scheme was designed for early shrinkage of high performance concrete, the test method; then, analyzes the main influence factors of performance concrete bridge; the bridge pile foundation, the test results of the early shrinkage of high performance concrete discussion summary of the fly ash, silica fume, and the compound of fly ash and silica fume effects on early age premature shrinkage of high-performance concrete.
Finally, the study on cracking mechanism of bridge pile foundation of high performance concrete is carried out. Firstly, analyzed the mechanism of concrete cracking of high performance, analyzes the main influence factors of cracking of high performance concrete. Secondly, the design of the test method, high performance concrete crack resistance test and then, the influence of fly ash and silica fume on the crack resistance of high performance concrete are discussed; finally, discusses the improvement of construction quality of high performance concrete measures of bridge pile foundation.
Key words: bridge pile foundation; high performance concrete; premature contraction; mechanism of crack resistance
目录
1 绪论 5
1.1 研究的意义 5
1.2 国内外研究进展 5
1.3 研究的目的 7
1.4 研究的内容 8
2 桥梁桩基高性能混凝土的力学性能 9
2.1 试验材料 9
2.2 高性能混凝土的抗拉强度 11
2.3 粉煤灰对高性能混凝土强度的影响 11
2.4 矿渣对高性能混凝土强度的影响 13
2.5 硅灰掺量对高性能混凝土强度的影响 14
2.6 复掺粉煤灰和硅灰对高性能混凝土抗压强度的影响 15
2.7 本章小节 17
3 桥梁桩基高性能混凝土的早期自收缩机理研究 19
3.1 混凝土自收缩机理 19
3.2 高性能混凝土早期收缩试验方案 20
3.3 影响桥梁桩基高性能混凝土的主要因素 22
3.4 桥梁桩基高性能混凝土早期收缩的试验结果 23
3.5粉煤灰对高
