The principles of sustainability dictate that construction materials should be recycled whenever possible. In the US, it is a common practice to crush old concrete pavements at the end of their service lives into recycled concrete aggregate (RCA) for use in the base course of new pavements but not to use the RCA in the new concrete pavement layer itself. In the 1980s, a number of trial projects were built in the US; however, their performance has never been evaluated quantitatively against that of similar conventional concrete pavements. In this paper, the performance of trial sections built in Minnesota were compared to that of their conventional counterparts. Such a study was necessary to evaluate the sustainability of using RCA in the concrete pavement. Analysis techniques employed included triple exponential smoothing, autoregressive integrated moving average, artificial neural network and Markov models. The mean time to reach a condition requiring a major CPR was found to be 27 years for the RCA pavements and 32 years for the non-RCA pavements. Despite this fact, it is possible to make the use of RCA in new concrete economically viable and sustainable. A lifecycle cost analysis over a 40 year time period showed the pavements with 100% coarse RCA to be cheaper at $1.10 per m² compared to the conventional concrete.

可持续性原则规定，应尽可能回收利用建筑材料。在美国，通常的做法是在使用寿命结束时将旧混凝土路面压碎成再生混凝土骨料（RCA），用于新路面的基础过程，而不是在新混凝土路面层本身中使用RCA 。在1980年代，美国建立了许多试验项目。但是，从未对它们的性能与类似的常规混凝土路面进行定量评估。在本文中，将在明尼苏达州建造的试验区的性能与常规试验区的性能进行了比较。这项研究对于评估在混凝土路面中使用RCA的可持续性是必要的。使用的分析技术包括三重指数平滑，自回归综合移动平均值，人工神经网络和马尔可夫模型。发现RCA路面达到需要大CPR的条件的平均时间为27年，非RCA路面为​​32年。尽管如此，仍可以在经济可行和可持续的新混凝土中使用RCA。在40年的时间周期内进行的生命周期成本分析显示，采用100％粗RCA的路面价格便宜，每平方米1.10美元²与常规混凝土相比。