预填集料混凝土研究

Research on Preplaced Aggregate Concrete

PAC粗集料含量高,胶材用量省,体积稳定性与耐久性好。但灌浆工艺与灌注密实度,灌浆料的工作性能、力学性能与体积稳定性,粗集料的级配组成与空隙率等诸多因素都可能影响PAC的微观结构与宏观力学性能。为了解PAC的研究与工程应用现状,梳理了PAC的发展与应用历程,分析了现行施工工艺与制备方法特点,总结了灌浆料和集料特性对PAC的影响,探讨了PAC研究与应用存在的问题及其发展趋势。

PAC has the advantages of high coarse aggregate content,low glue consumption,good volume stability and durability.However,many factors,such as the grouting process and the filling compactness,the working performance,mechanical properties and volume stability of the grouting material,the grading composition and voids of coarse aggregate,may affect the microstructure and macroscopic mechanical properties of PAC.In order to understand the status of PAC research and engineering application,the development and application process of PAC were summarized.The characteristics of current construction technology and preparation method were analyzed.The influence of grouting material and aggregate characteristics on PAC was summarized,and the existing problems and development trend of PAC research and application were discussed.