Lightweight foam concrete is a cementitious cellular solid with a series of functional properties. Its non-structural applications potentially permit a high-volume inclusion of particles (e.g., recycled fines). However, the particle inclusion tends to alter the foam morphology and diminish the mechanical performance of foam concrete. To promote the acceptance of particle inclusion while minimizing the performance loss, this work studies the impact of sand inclusions on the mechanical properties of a group of lightweight foam concrete mixtures at 0.4 and 0.6 g/cm³, with various particle sizes and inclusion ratios. The morphology of lightweight foam concrete that is closely related to its mechanical performance is characterized using optical and scanning electron microscope (SEM) imaging. Several tests characterizing the fundamental resonant frequency, elastic modulus, crushing strength, and compressive strength, are also implemented as direct mechanical measurements of the foam concrete samples. Based on the experimental results, a model is derived for predicting the strength of lightweight foam concrete with different particle inclusions. Our study suggests that the degradation of foam structure is the major cause of the loss on mechanical performance, but a high-volume particle inclusion can be achieved with proper implementation.

轻质泡沫混凝土是一种具有一系列功能特性的水泥多孔固体。它的非结构应用可能允许大量包含颗粒（例如，回收细粒）。然而，颗粒内含物往往会改变泡沫形态并降低泡沫混凝土的机械性能。为了在最大程度降低性能损失的同时促进颗粒夹杂物的接受，这项工作研究了夹砂对一组 0.4 和 0.6 g/cm ³的轻质泡沫混凝土混合物机械性能的影响，具有各种粒径和夹杂比。使用光学和扫描电子显微镜 (SEM) 成像表征与其力学性能密切相关的轻质泡沫混凝土的形态。一些表征基本共振频率、弹性模量、抗压强度和抗压强度的测试也作为泡沫混凝土样品的直接机械测量来实施。根据实验结果，推导出了预测不同颗粒夹杂物轻质泡沫混凝土强度的模型。我们的研究表明，泡沫结构的退化是机械性能损失的主要原因，但通过适当的实施，可以实现大量颗粒夹杂。