多重劣化机制作用下混凝土的性能和耐久性（英文）

Performance and Durability of Concrete Under Effect of Multi-Deterioration Mechanisms

基于近年来芬兰VT技术研究中心在混凝土性能和耐久性方面的研究成果,对多重劣化机制共同作用下混凝土耐久性能表现进行了综述。这些研究是建立在30余年来有关混凝土耐久性的研究结果之上,包括15年的现场暴露实验数据,有关混凝土耐久性能是通过实验室加速实验结果和现场暴露实验结果共同评价的。结果显示,实验室的单一因素作用下的混凝土耐久性加速劣化结果与多因素共同作用下的暴露实验和工程现场测试结果有很大的差异。现场测试能够获得较长期的混凝土耐久性结果,这可以用来校准和验证混凝土耐久性和寿命预测模型,并引导继续对多因素共同作用下混凝土的耐久性能进行更全面深入的研究。

This paper provides an overview on the effect of combined deterioration mechanisms on concrete durability performance, based on research performed at VTT Technical Research Centre of Finland Ltd over the last few years. The research project built on more than 30 years of concrete durability research, including ca. 15 years of field studies. The durability performance was assesses with both accelerated laboratory testing and in-situ exposure results. These results presented here give some examples of the wide range of laboratory and field investigations that have been a part of the Finnish studies on the effect of multi-deterioration mechanisms. The research has shown that single attacks tested in laboratory conditions yield different results than what may actually be experienced in field applications or in-situ concrete structures, where multiple deterioration types are occurring simultaneously. Field testing will go on to obtain long term results for calibration and verification of durability and service life models. Another goal is to continue also with more comprehensive studies on the multi-deterioration mechanisms. Research into modelling multi-deterioration mechanisms has also led to the development of service life design/assessment tools, with the objective to assist engineers in more realistically estimating long-term concrete infrastructure performance.