This paper investigates the effect of the addition of recycled concrete aggregate (RCA) on the properties of self-compacting cement-based materials at the mortar scale, at the incorporation ratios of 0, 25, 50, and 100 %. The results showed that the yield stress and the plastic viscosity of the mortar increased with the incorporation ratio of RCA. Slump flow and V-funnel time were used to assess these properties. The mechanical strength of the mix also increases with the RCA incorporation ratio. A quantitative analysis of the data demonstrated that the effect of the addition of RCA on the mortar's rheological properties can be attributed to a decrease of the aggregate's packing density (morphology effect), a decrease of the effective water-to-cement ratio of the mix (water-to-cement ratio effect), and an increase of the aggregate's effective volume fraction (volume fraction effect). The latter two effects are caused by the aggregate's high water absorption, whose impact on mechanical strength is stronger than that caused by the morphology effect. In addition, the increase of the mix's strength can also be attributed to the increase of the effective water-to-cement ratio of the mix and to the bonding quality between the aggregate and the cementitious matrix. The increment in the incorporation ratio of RCA causes a reduction of the effective water-cement ratio of the mix and an increase of the bonding quality.

本文研究了再生混凝土骨料(RCA) 在砂浆规模、掺入比例为 0、25、50 和 100% 时对自密实水泥基材料性能的影响。结果表明，随着RCA掺入量的增加，砂浆的屈服应力和塑性粘度增大。使用坍落度和 V 型漏斗时间来评估这些性能。混合物的机械强度也随着 RCA 掺入比例的增加而增加。数据的定量分析表明，添加 RCA 对砂浆流变性能的影响可归因于骨料堆积密度的降低（形态效应）、混合料有效水灰比的降低（水灰比效应），以及骨料有效体积分数的增加（体积分数效应）。后两种效应是由骨料的高吸水率引起的，其对机械强度的影响强于形态效应引起的影响。此外，混合料强度的增加还可以归因于混合料有效水灰比的增加以及骨料与水泥基体之间的粘结质量的增加。RCA掺入比例的增加导致混合料有效水灰比的降低和粘结质量的提高。