Various thermal conductivity models for multi-phase materials have been suggested in the literature. However, none have been specifically developed or adapted for structural lightweight aggregate concrete (SLWAC). In this context, the main purpose of this study was to develop a new simple model to predict the thermal conductivity of SLWAC, taking into account the volume fraction and thermal characteristics of each phase and an empirical factor that considers the uneven heat flux distribution through them. The study was based on an extensive experimental campaign carried out for different water to cement ratios and types and volume fractions of aggregate. Moreover, given that there are no standards for determining the thermal conductivity of lightweight aggregates (LWAs), a new technique was devised. The proposed model is easily implemented in practice, contributing to expeditious estimation of the thermal conductivity of the most common SLWAC regardless of the type of LWA and concrete composition.

中文翻译：

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结构轻骨料混凝土导热系数建模

文献中已经提出了用于多相材料的各种热导率模型。然而，没有一个是专门为结构轻骨料混凝土 (SLWAC) 开发或改造的。在此背景下，本研究的主要目的是开发一个新的简单模型来预测 SLWAC 的热导率，同时考虑各相的体积分数和热特性，以及考虑通过它们的不均匀热通量分布的经验因素. 该研究基于针对不同的水灰比以及骨料的类型和体积分数进行的广泛的实验活动。此外，鉴于没有确定轻质骨料 (LWA) 热导率的标准，因此设计了一种新技术。