Foam concrete has a low density and excellent functionality, which has been widely used in construction applications. Considering the recycling and reusing of waste clay brick from construction and demolition waste (CDW), the clay brick powder (CBP) derived from waste clay brick was used as the supplementary cementitious material (SCM) to prepare foam concrete in this paper. The foam concrete with various densities and CBP replacements were first prepared, and then the drying shrinkage, mechanical properties, water absorption and pore distribution were determined. The results show that the CBP possesses the fundamental characteristics of SCM, and the pozzolanic index of high fineness CBP is approximately 89.6%. The added CBP has no obvious impact on the dry apparent density and pore distribution of foam concrete. Incorporating CBP reduces the drying shrinkage of foam concrete, and the maximum shrinkage ratio and CBP replacement follows a good relationship. The compressive strength of foam concrete with CBP up to 15% is similar to and even higher than that of the foam concrete without CBP; however, the compressive strength decreases with the further increase of CBP replacements. The effects of CBP content on the properties of low-density foam concrete are more obvious than those of the high-density foam concrete. In particular, the utilization of CBP in foam concrete preparation has excellent recycling efficiency, economic and environmental benefit.

泡沫混凝土具有低密度和优异的功能性，已被广泛用于建筑应用中。考虑到建筑废料和拆建废料中的废旧砖的循环再利用，本文以废旧砖中的废砖粉（CBP）作为补充胶凝材料（SCM）来制备泡沫混凝土。首先制备各种密度和CBP替代的泡沫混凝土，然后测定其干缩，力学性能，吸水率和孔分布。结果表明，CBP具有SCM的基本特性，高细度CBP的火山灰指数约为89.6％。添加的CBP对泡沫混凝土的干表观密度和孔分布没有明显影响。掺入CBP可降低泡沫混凝土的干燥收缩率，并且最大收缩率与CBP替代关系良好。CBP高达15％的泡沫混凝土的抗压强度与没有CBP的泡沫混凝土的抗压强度相近，甚至更高。然而，随着CBP替代物的进一步增加，抗压强度降低。CBP含量对低密度泡沫混凝土性能的影响比高密度泡沫混凝土更明显。特别地，在泡沫混凝土制备中使用CBP具有优异的回收效率，经济和环境效益。CBP高达15％的泡沫混凝土的抗压强度与没有CBP的泡沫混凝土的抗压强度相近，甚至更高。然而，随着CBP替代物的进一步增加，抗压强度降低。CBP含量对低密度泡沫混凝土性能的影响比高密度泡沫混凝土更明显。特别地，在泡沫混凝土制备中使用CBP具有优异的回收效率，经济和环境效益。CBP高达15％的泡沫混凝土的抗压强度与没有CBP的泡沫混凝土的抗压强度相近，甚至更高。然而，随着CBP替代物的进一步增加，抗压强度降低。CBP含量对低密度泡沫混凝土性能的影响比高密度泡沫混凝土更明显。特别地，在泡沫混凝土制备中使用CBP具有优异的回收效率，经济和环境效益。