ABSTRACT

In this study, a total of four different mixes were prepared by partially replacing natural aggregates by Recycled Asphalt Pavement (RAP) in different proportions. The results showed that adding RAP to the mixture reduced the mechanical strength of the Roller Compacted Concrete (RCC) mixture. The best mechanical strength was obtained at 50% RAP replacement. To increase the mechanical strength of RCC made with 50% RAP, Micro Silica (MS) with partial replacement of cement at 3%, 6%, 9%, and 12% was used. Increasing the MS content from 3 to 12% caused the mechanical strength of all mixtures to increase. The results showed that RCC7 with 50% RAP and 9% MS had about 20% more compressive strength. Also, the increase in tensile splitting and flexural strength was 6 and 2%, respectively. The statistical analysis indicates that there was a strong relationship (R² > 0.98) between flexural strength values estimated from the regression model and the measured laboratory values (this relationship was about 0.84 for compressive strength and tensile splitting strength). The estimation of tensile splitting strength and flexural strength with respect to compressive strength showed that there was a strong (R² > 0.98) and good relationship (R² > 0.75) between them, respectively.

摘要

在这项研究中，通过用不同比例的再生沥青路面 (RAP) 部分替代天然骨料，制备了总共四种不同的混合物。结果表明，向混合物中添加 RAP 会降低碾压混凝土 (RCC) 混合物的机械强度。在 50% RAP 更换时获得最佳机械强度。为了提高用 50% RAP 制成的 RCC 的机械强度，使用了 3%、6%、9% 和 12% 的部分替代水泥的微硅石 (MS)。将 MS 含量从 3% 增加到 12% 会导致所有混合物的机械强度增加。结果表明，具有 50% RAP 和 9% MS 的 RCC7 的抗压强度提高了约 20%。此外，拉伸劈裂和弯曲强度的增加分别为 6% 和 2%。R ² > 0.98）在从回归模型估计的抗弯强度值和实测的实验室值之间（这种关系对于抗压强度和拉伸劈裂强度约为 0.84）。拉伸劈裂强度和弯曲强度相对于抗压强度的估计表明，它们之间分别存在强（R ² > 0.98）和良好的关系（R ² > 0.75）。