The inferior quality of recycled concrete aggregate (RCA) caused by the adhered mortar (AM) can be principally enhanced through either removing or strengthening the AM. This paper reviews the effect of various pretreatment methods (removal, polymer impregnation, pozzolanic slurry immersion, accelerated carbonation curing and bio-deposition) on the inherent defects of RCA, and compares their modification efficiency based on statistical analyses of results in published papers. The pretreatment methods can significantly reduce the mercury intrusion porosity (an average of 41.3% drop) and water absorption (an average of 24.5% drop) of RCA and concurrently augment the mechanical properties considerably. The modification efficiency of removal methods is mainly governed by treatment approaches and parameters. The improved efficiency of polymer impregnation and pozzolanic slurry immersion is primarily determined by the quality of integument and cladding related to the type of treated materials and pretreatment parameters. The carbonation and bio-deposition efficiency of RCA is closely related to aggregate characteristic/the type of microorganism and pretreatment conditions. Overall, paraffin soaking, presoak-accelerated carbonation and combined removal of AM are the most efficient methods to improve the performance of RCA. A better understanding of the characteristics of the treated RCA can provide a theoretical base for future research and applications of RCA in construction industry.

可以通过去除或增强AM来主要提高由粘结砂浆（AM）引起的再生混凝土骨料（RCA）的劣质。本文综述了各种预处理方法（去除，聚合物浸渍，火山灰淤浆浸渍，加速碳酸化固化和生物沉积）对RCA固有缺陷的影响，并根据发表论文的结果进行统计分析，比较了它们的改性效率。预处理方法可以显着降低RCA的汞侵入孔隙率（平均下降41.3％）和吸水率（平均下降24.5％），并同时显着提高机械性能。去除方法的修饰效率主要取决于处理方法和参数。聚合物浸渍和火山灰浆料浸入的效率提高，主要取决于与处理材料类型和预处理参数有关的外皮和覆层质量。RCA的碳化和生物沉积效率与聚集体特征/微生物类型和预处理条件密切相关。总体而言，石蜡浸泡，预浸泡加速碳酸化和AM的联合去除是提高RCA性能的最有效方法。更好地了解已处理RCA的特性可以为RCA在建筑行业中的未来研究和应用提供理论依据。RCA的碳化和生物沉积效率与聚集体特征/微生物类型和预处理条件密切相关。总体而言，石蜡浸泡，预浸泡加速碳酸化和AM的联合去除是提高RCA性能的最有效方法。更好地了解已处理RCA的特性可以为RCA在建筑行业中的未来研究和应用提供理论依据。RCA的碳化和生物沉积效率与聚集体特征/微生物类型和预处理条件密切相关。总体而言，石蜡浸泡，预浸泡加速碳酸化和AM的联合去除是提高RCA性能的最有效方法。更好地了解已处理RCA的特性可以为RCA在建筑行业中的未来研究和应用提供理论依据。