The utilization of recycled fine powder as the replacement for cement clinker can reduce the production pollution of cementitious materials to the environment thus recycling resources. In this work, recycled fine powders of sintered brick (SBP), brick-concrete aggregate (BAP), and aerated concrete (ACP) were ground and considered as replacements for cement clinker for new cementitious materials. The results show that SBP, BAP, and ACP similar FA contain SiO2, Al2O3, and other active ingredients, which all reflect potential pozzolana activity. The declining impact on the hydration process can be further intensified with the increasing dosage. Compared to the control, the peak temperature of cement paste with 40%FA is the highest (52.22 °C), the peak temperature of cement paste with 40%SBP is the lowest (46.71 °C), the duration of the induction period of cement paste with 40%BAP is the shortest (0.93 h), and the peak temperature point of the acceleration period of cement paste with 40%ACP is the earliest (5.15 h), which are decreased by 25.67 %, 40.68 %, 89.41 % and 57.58 %. The rheological parameter including shear stress, apparent viscosity, and yield stress of fresh cement paste was increased by the addition of recycled fine powders. The declining order for compressive strength of cementitious materials by the powder is FA, SBP, ACP, and BAP. Compared to ACP and BAP, the active SiO2 and Al2O3 content in FA and SBP is high, which denses the structure thus attenuating its declining effect on mechanical properties.

中文翻译：

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回收细粉的性能及其对胶凝材料的影响


利用回收的细粉作为水泥熟料的替代品，可以减少胶凝材料对环境的生产污染，从而回收资源。在这项工作中，烧结砖 （SBP）、砖混凝土骨料 （BAP） 和加气混凝土 （ACP） 的回收细粉末被研磨，并被视为新胶凝材料的水泥熟料替代品。结果表明，SBP、BAP 和 ACP 相似的 FA 含有 SiO2、Al2O3 和其他活性成分，这些成分都反映了潜在的火山灰活性。随着剂量的增加，对水合过程的影响会进一步加剧。与对照相比，40%FA水泥浆的峰值温度最高（52.22 °C），40%SBP水泥浆的峰值温度最低（46.71 °C），40%BAP水泥浆的诱导期持续时间最短（0.93 h），40%ACP水泥浆的加速期峰值温度点最早（5.15 h）， 分别下降了 25.67 %、40.68 %、89.41 % 和 57.58 %。添加回收细粉后，新水泥浆体的流变参数（包括剪切应力、表观粘度和屈服应力）均有所增加。粉末对胶凝材料抗压强度的递减顺序为 FA、SBP、ACP 和 BAP。与 ACP 和 BAP 相比，FA 和 SBP 中的活性 SiO2 和 Al2O3 含量较高，这使结构致密，从而减弱了其对机械性能的下降影响。