Oikonomopoulou Konstantina, Ioannou Sokrates, Savva Pericles, Spanou Maria, Nicolaides Demetris, Petrou Michael F
Department of Civil and Environmental Engineering, University of Cyprus, 1678 Nicosia, Cyprus.
Department of Civil Engineering, Abu Dhabi Men's Campus Higher Colleges of Technology, Abu Dhabi 25026, United Arab Emirates.
Materials (Basel). 2022 Apr 14;15(8):2871. doi: 10.3390/ma15082871.
The objective of this research was to study the effect of an optimal mechanical treatment method to reduce the mortar adhered on recycled aggregates (RCA) on the long-term mechanical properties and durability of concretes containing RCA at different replacement levels. It was found that concretes incorporating treated RCA exhibited sharper and more significant increase on 90- and 365-day compressive strengths than any other investigated mixture. The same mixtures also benefitted from a 'shrinkage-controlling' effect, where strains and mass losses were reduced by almost 15% and 10%, respectively, compared to the reference concrete. While sulfate resistance and carbonation resistance are predominantly defined by the hydration products available within the cement paste and not to a large extent by the aggregate type and quality, the incorporation of either treated or untreated RCA in concrete did not appear to expose RACs to significant durability threats.
本研究的目的是研究一种优化的机械处理方法对减少再生骨料（RCA）上附着的砂浆的影响，该方法涉及不同替代水平下含RCA混凝土的长期力学性能和耐久性。研究发现，与任何其他研究的混合物相比，掺入经处理RCA的混凝土在90天和365天抗压强度上呈现出更显著且更明显的增长。相同的混合物还受益于“收缩控制”效应，与参考混凝土相比，应变和质量损失分别减少了近15%和10%。虽然抗硫酸盐性和抗碳化性主要由水泥浆体中可用的水化产物决定，在很大程度上并非由骨料类型和质量决定，但在混凝土中掺入经处理或未经处理的RCA似乎并未使RAC面临重大的耐久性威胁。
