废旧沥青砼纤维水泥稳定碎石的力学性能试验

摘要

为了研究废旧沥青混凝土破碎后作为道路半刚性基层水泥稳定碎石的基本力学性能，以及纤维掺入提高其抗裂性能、减少路面反射裂缝等问题，以水泥、纤维、废旧沥青砼和粉煤灰掺量为影响因素，根据正交试验方法，安排了16组试验分别进行了无侧限抗压试验、劈裂试验和干缩试验。结果表明：各因素对无侧限抗压强度的影响敏感性大小依次为水泥＞粉煤灰＞纤维＞废旧沥青砼，废旧沥青砼纤维水泥稳定碎石在强度上可以满足各级公路基层、底基层材料的强度要求，建议在废旧沥青砼纤维水泥稳定碎石优化设计中以水泥和粉煤灰作为主要控制要素。%The basic mechanical properties of RAP used as semi-rigid cement stabilized macadam base were re-searched.Fiber was added to improve the crack resistance of the cement stable macadam mixture and reduce pavement reflection crack.Sixteen orthogonal experiments were done by the factors as cement,fiber,waste asphalt concrete and fly ash.The unconfined compression test and split test and drying shrinkage experiment were carried out.The results show that the effect of the factors on the sensitivity of unconfined compression strength is obviously different.The effect order from large to small is cement,fly ash,fiber,waste asphalt concrete.RAP fiber cement stabilized macadam can satisfy the requriments of base and subbase of all levels of the road.Cement and fly ash are the main control factors in design.