The paper evaluates the durability properties of Self-Consolidating Concrete (SCC) containing fine and coarse recycled concrete aggregates. The SCC mixtures were made with 0%, 25%, 50%, 75% and 100% substitution of Fine Natural Aggregates (FNA) with Fine Recycled Concrete Aggregates (FRCA) whereas Coarse Natural aggregates (CNA) were partially substituted (50%) with Coarse Recycled Concrete Aggregates (CRCA). Ordinary Portland Cement (OPC) was blended with 30% of Fly Ash (FA) which is further substituted with 10% of Metakaolin (MK). The durability parameters of SCC mixtures were evaluated using tests such as, Initial Surface Absorption Test (ISAT), Water Penetrability Test, Rapid Chloride Penetrability Test (RCPT), and Capillary Suction Test (CST). The Compressive strength test and Ultrasonic Pulse Velocity (UPV) test was also conducted on SCC mixtures. The durability and compressive strength properties of the SCC mixtures were found to deteriorate with the replacement of both CNA and FNA. At 120 days of curing, an increase of the order of 17.5%, 18.7%, 7.1% and 26.7% was observed in the results obtained in ISAT, RCPT, CST and Water Penetrability Test respectively with the substitution of FRCA with FNA and CRCA with CNA. However, the introduction of MK in the concrete matrix proved very effective as the values of ISAT, RCPT, CST and Water Penetrability Tests were observed at par with the control mix even with 75% FRCA and 50% CRCA content. In case of compressive strength, 9.3% drop was observed with 100% FRCA and 50% CRCA content. However, the presence of MK has been found to compensate this to 4.5% only. Moreover, all SCC mixtures with CRCA and FRCA and MK can be classified in the excellent category on the basis of their UPV values.

本文评估了包含细和粗再生混凝土骨料的自固结混凝土（SCC）的耐久性能。SCC混合物是用精细再生混凝土骨料（FRCA）分别用0％，25％，50％，75％和100％的精细天然骨料（FNA）代替，而粗天然骨料（CNA）被部分替代（50％）粗再生混凝土骨料（CRCA）。将普通波特兰水泥（OPC）与30％的粉煤灰（FA）混合，然后进一步用10％的偏高岭土（MK）代替。使用诸如初始表面吸收测试（ISAT），水渗透性测试，快速氯化物渗透性测试（RCPT）和毛细管抽吸测试（CST）等测试对SCC混合物的耐久性参数进行了评估。还对SCC混合物进行了抗压强度测试和超声波脉冲速度（UPV）测试。发现SCC混合物的耐久性和抗压强度性能随着CNA和FNA的替换而变差。在固化120天后，在ISAT，RCPT，CST和水渗透性测试中获得的结果分别为FRCA替换为FNA，而CRCA替换为CRNA，结果分别提高了17.5％，18.7％，7.1％和26.7％。 CNA。然而，将MK引入混凝土基体证明非常有效，因为即使在75％FRCA和50％CRCA含量的情况下，也可以观察到与对照混合物相当的ISAT，RCPT，CST和水渗透性测试值。在抗压强度的情况下，当FRCA含量为100％和CRCA含量为50％时，观察到下降9.3％。然而，已经发现，MK的存在只能将其补偿到4.5％。此外，所有具有CRCA，FRCA和MK的SCC混合物均可以根据其UPV值归类为优良类别。