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介绍了国内外学者在大气环境下轻骨料混凝土耐久性能方面的工作及研究成果,揭示了轻骨料混凝土与普通混凝土碳化机理的差异,系统分析了影响碳化的主要因素,阐述了现有碳化深度预测模型的优缺点。结果表明:现有研究广泛采用快速碳化试验,对轻骨料混凝土实际工程碳化规律的探索主要集中在20世纪;基于试验研究的宏观预测模型较多,考虑微结构内CO_2扩散机制的理论模型较少;大气环境下结构服役寿命预测模型缺乏相关试验验证。建议今后重点从细观、宏观2个层面进一步探索快速碳化及大气环境下轻骨料混凝土劣化规律,基于扩散机制及化学反应动力学建立碳化理论模型,分析复杂环境作用和环境-荷载耦合作用下构件的时变性能特点。
This paper introduces the work and research results of domestic and foreign scholars on the durability of lightweight aggregate concrete in atmospheric environment, reveals the differences of carbonation mechanism between lightweight aggregate concrete and ordinary concrete, systematically analyzes the main factors affecting carbonization, expounds the existing carbonization The advantages and disadvantages of depth prediction model. The results show that the rapid carbonation test is widely used in the existing research, and the exploration of the carbonization regularity of lightweight aggregate concrete is mainly concentrated in the 20th century. The macroscopic prediction model based on experimental research is more. Considering the theoretical model of CO_2 diffusion mechanism in microstructure Less; the service life prediction model under atmospheric environment lacks relevant experimental verification. In the future, it is suggested that the light carbonization and atmospheric environment should be further explored from the perspective of meso-macroscopic and macroscopic levels to establish a carbonation theoretical model based on diffusion mechanism and chemical reaction kinetics. The effects of complex environment and environment-load coupling are analyzed Components of the time-varying performance characteristics.