Recycled powder (RP) that includes recycled paste powder (RPP), recycled mortar powder (RMP), and recycled concrete powder (RCP) is an eco-friendly alternative binder. This work investigated the influence of RP types and fineness on early-age behavior and mechanical strength of cement-based materials. The results show that substituting RP for cement causes the reduction of new hydration products in cement-based materials. The blended RP decreases the fluidity of paste mixture, and the fluidity of paste including fine RPP is lower than that of paste including fine RMP and RCP; moreover, the fluidity increases following the growth of RP particle size. Incorporating fine RPP shortens the setting time of cement-based materials, while the setting time is prolonged as RMP and RCP incorporate; in addition, the enlarged particle size of RP prolongs the setting time. The drying shrinkage increases following the increasing replacement ratio of RPP. Incorporating less proportion of fine RMP and RCP lessens the drying shrinkage of paste, while the drying shrinkage increases after coarse or high-volume RMP and RCP substituting. The maximum shrinkage of paste including 30% fine and coarse RCP is 3.4% and 7.3% higher than that of plain paste. Substituting fine RP for less dosage of cement has less impact on the mechanical strength of its newmade mortar, while the mechanical strength markedly decreases after high-volume or coarse RP substituting. The compression strength of mortar including 30% fine and coarse RCP is 22.2% and 35.1% lower than that of plain mortar.

中文翻译：

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不同类型和细度再生粉的水泥基材料的早期行为和力学性能

再生粉 (RP) 包括再生糊粉 (RPP)、再生砂浆粉 (RMP) 和再生混凝土粉 (RCP)，是一种环保的替代粘合剂。这项工作研究了 RP 类型和细度对水泥基材料的早期行为和机械强度的影响。结果表明，用 RP 代替水泥会导致水泥基材料中新水化产物的减少。共混的RP降低了浆料混合物的流动性，含细RPP的浆料流动性低于含细RMP和RCP的浆料；此外，流动性随着 RP 粒径的增大而增加。掺入细RPP缩短了水泥基材料的凝结时间，而掺入RMP和RCP则延长了凝结时间；此外，RP粒径增大，凝固时间延长。干燥收缩率随着RPP替代率的增加而增加。掺入较少比例的细RMP和RCP减少了浆料的干燥收缩，而粗或大量RMP和RCP替代后干燥收缩增加。含30%细、粗RCP的浆料的最大收缩率比普通浆料高3.4%和7.3%。用较少量的水泥代用细RP对其新造砂浆的力学强度影响较小，而大体积或粗RP代用后机械强度明显下降。含30%细、粗RCP的砂浆的抗压强度比普通砂浆低22.2%和35.1%。掺入较少比例的细RMP和RCP减少了浆料的干燥收缩，而粗或大量RMP和RCP替代后干燥收缩增加。含30%细、粗RCP的浆料的最大收缩率比普通浆料高3.4%和7.3%。用较少量的水泥代用细RP对其新造砂浆的力学强度影响较小，而大体积或粗RP代用后机械强度明显下降。含30%细、粗RCP的砂浆的抗压强度比普通砂浆低22.2%和35.1%。掺入较少比例的细RMP和RCP减少了浆料的干燥收缩，而粗或大量RMP和RCP替代后干燥收缩增加。含30%细、粗RCP的浆料的最大收缩率比普通浆料高3.4%和7.3%。用较少量的水泥代用细RP对其新造砂浆的力学强度影响较小，而大体积或粗RP代用后机械强度明显下降。含30%细、粗RCP的砂浆的抗压强度比普通砂浆低22.2%和35.1%。含30%细、粗RCP的浆料的最大收缩率比普通浆料高3.4%和7.3%。用较少量的水泥代用细RP对其新造砂浆的力学强度影响较小，而大体积或粗RP代用后机械强度明显下降。含30%细、粗RCP的砂浆的抗压强度比普通砂浆低22.2%和35.1%。含30%细、粗RCP的浆料的最大收缩率比普通浆料高3.4%和7.3%。用较少量的水泥代用细RP对其新造砂浆的力学强度影响较小，而大体积或粗RP代用后机械强度明显下降。含30%细、粗RCP的砂浆的抗压强度比普通砂浆低22.2%和35.1%。