开裂混凝土氯离子传输性能研究综述:实验研究和计算机模拟(英文)

A review of the chloride transport properties of cracked concrete: experiments and simulations

目的:综述开裂混凝土中氯离子传输性能的研究方法、研究进展、最新研究成果和研究方向。结论:实验研究和计算机模拟均表明开裂混凝土中氯离子传输性能与裂缝形貌、混凝土组成和混凝土受力状态等因素有关。现有研究虽已取得一定成果,但是仍需深入研究其他因素对开裂混凝土氯离子传输性能的影响,如冻融循环、疲劳和饱和度等。在此基础上才能准确预测开裂混凝土结构在氯盐环境中的服役寿命。

Chloride transport property is very important for the durability and service life of reinforced concrete structures subjected to marine environments and de-icing salt. In reality, for different reasons, concrete structures are frequently cracked, and cracks can alter the chloride transport properties of concrete. Recently, several studies have been conducted by both experiment and simulation on the influence of cracks on the chloride transport properties of concrete. The aim of this paper is to review these research efforts. The experimental methods and simulation approaches on the chloride transport properties of cracked concrete are introduced. Detailed discussions on the findings from these experimental and simulation studies are given. The chloride transport properties of cracked concrete are influenced by various factors, such as crack geometry, concrete composition, and load condi- tion. Research in this area is still on-going, and many problems need to be settled before proposing reliable models for predicting the service life of real cracked concrete structures in chloride environments. Hence, some further research topics are recom- mended. The influences of other factors, such as carbonation, freeze-thaw, fatigue, and saturation degree, on the transport prop- erties of cracked concrete should be revealed.