This paper investigates the utilization of powder recycled from construction and industrial waste in the construction industry. To alleviate the negative environmental impact of cement industry, recycled concrete powder (RCP) and spontaneous combustion gangue powder (SCGP) were used as supplementary materials to substitute part of the cement. Six recycled mortar mixes were designed with various contents of RCP and SCGP. In this test, the total replacement ratio of the recycled powder (RCP and SCGP) varied from 0 to 50%. The mechanical and durability properties of the recycled mortar were investigated in combination with microstructure analysis. The findings reveal that 15% RCP and 15% SCGP is a suitable combination for the recycled mortar to maintain mechanical properties comparable to those of the control mix. When the total substitution ratio of RCP and SCGP does not exceed 30%, their incorporation leads to better durability properties of the recycled mortar compared to those of the mix containing one type of recycled powder. Consistent with the mechanical and durability analyses, the microstructure analysis reveals that the combination of 15% RCP and 15% SCGP contributes to a dense structure of the mortar, which benefits from the synergetic effect of the relatively high pozzolanic reactivity of SCGP and the filling ability of RCP.

本文研究了建筑业中从建筑和工业废物中回收的粉末的利用情况。为了减轻水泥工业对环境的不利影响，使用了再生混凝土粉（RCP）和自燃powder石粉（SCGP）作为补充材料来代替部分水泥。设计了六种具有不同RCP和SCGP含量的再生砂浆混合物。在该测试中，再生粉末（RCP和SCGP）的总替代率从0％到50％不等。结合微观结构分析研究了再生砂浆的机械和耐久性能。研究结果表明，15％的RCP和15％的SCGP是再生砂浆的合适组合，以保持与对照混合物相当的机械性能。当RCP和SCGP的总取代率不超过30％时，与包含一种类型的再生粉末的混合物相比，它们的掺入导致再生砂浆的更好的耐久性能。与力学和耐久性分析一致，微观结构分析表明，15％RCP和15％SCGP的组合有助于形成砂浆的致密结构，这得益于SCGP相对较高的火山灰反应性和填充能力的协同作用RCP。