An innovative system of pre-cast high performance concrete pre-walls, combined with low-cement cast-in-situ lightweight concrete core, is studied experimentally from the standpoint of the thermophysical properties of the concrete compositions under various hygroscopic conditions. Thermal conductivity, volumetric heat capacity and thermal diffusivity are experimentally determined, by a transient method, for eight concrete compositions in the dry state, hygroscopic and over-hygroscopic ranges. The incorporation of lightweight aggregates in the concrete mixture allowed to reduce the thermal conductivity (up to 53%) and thermal diffusivity (up to 41%), in comparison to normal weight concrete. The moisture content, regardless of the composition of the concrete, impacts negatively the thermal performance, with a rise of both thermal conductivity and diffusivity, which was also captured by analytical expressions. An application study of the pre-walls system to a swimming pool showed reductions of thermal conductance of up to 38% when combining high mechanical performance concrete in the pre-walls with lightweight aggregate concrete with high thermal performance in the core. These results highlight the importance of assessing thermophysical properties in service conditions, with the moisture content effect included, and selecting the types of concrete in composite pre-walls systems to enhance both mechanical and thermal performance.

从混凝土组合物在各种吸湿条件下的热物理性能的角度，对预制高性能混凝土预制墙与低水泥现浇轻质混凝土核心相结合的创新系统进行了实验研究。热导率、体积热容和热扩散率是通过瞬态方法实验确定的，用于干燥状态、吸湿和过度吸湿范围内的八种混凝土组合物。与普通重量混凝土相比，在混凝土混合物中加入轻骨料可以降低热导率（高达 53%）和热扩散率（高达 41%）。无论混凝土的成分如何，水分含量都会对热性能产生负面影响，随着热导率和扩散率的上升，这也被解析表达式所捕获。一项将预制墙系统应用于游泳池的研究表明，当预制墙中的高机械性能混凝土与核心具有高热性能的轻骨料混凝土相结合时，热导率降低高达 38%。这些结果强调了评估使用条件下的热物理特性的重要性，其中包括水分含量的影响，以及选择复合预墙系统中的混凝土类型以提高机械和热性能的重要性。一项将预制墙系统应用于游泳池的研究表明，当预制墙中的高机械性能混凝土与核心具有高热性能的轻骨料混凝土相结合时，热导率降低高达 38%。这些结果强调了评估使用条件下的热物理特性的重要性，其中包括水分含量的影响，以及选择复合预墙系统中的混凝土类型以提高机械和热性能的重要性。一项将预制墙系统应用于游泳池的研究表明，当预制墙中的高机械性能混凝土与核心具有高热性能的轻骨料混凝土相结合时，热导率降低高达 38%。这些结果强调了评估使用条件下的热物理特性的重要性，其中包括水分含量的影响，以及选择复合预墙系统中的混凝土类型以提高机械和热性能的重要性。