Microstructural characteristics and properties of foamed concrete, a cellular lightweight cement paste with entrained air voids, are investigated. The complex 3D microstructures of the foamed concrete with different densities are obtained by micro-CT imaging and binarized as two-phase (pore/solid) materials by image processing. The mechanical responses of the microstructures are evaluated by simulations within the phase-field fracture model, and the input material parameters for simulations are identified. Microstructural characteristics and properties from experiments and simulations are correlated. In particular, linear attenuation coefficients for the solid phase in micro-CT images correlate with input material parameters. These correlations can serve to determine solid-phase input material parameters in foamed concretes with different densities. The behavior of foamed-concrete binders, modeled as multi-phase solids, should thus be evaluated more accurately through simulations, based on the observed correlations.

研究了泡沫混凝土的微结构特征和性能，泡沫混凝土是一种夹带气孔的蜂窝状轻质水泥浆。通过微CT成像获得具有不同密度的泡沫混凝土的复杂3D微观结构，并通过图像处理将其二值化为两相（孔/固体）材料。通过在相场断裂模型中进行仿真来评估微结构的机械响应，并确定用于仿真的输入材料参数。实验和模拟的微观结构特征和特性是相关的。尤其是，微CT图像中固相的线性衰减系数与输入的材料参数相关。这些相关性可以用来确定密度不同的泡沫混凝土中的固相输入材料参数。因此，应基于观察到的相关性，通过模拟更准确地评估建模为多相固体的泡沫混凝土粘合剂的性能。