VOLUMETRIC PROPERTIES OF ASPHALT CONCRETE MADE FROM ZANZIBAR CORALLINE AGGREGATES

This paper presents the unusual engineering properties of coralline aggregates used for asphalt binder course production during the rehabilitation of Zanzibar airport (Tanzania). The geotechnical and geomechanical properties of the coralline aggregates, asphalt concrete mix design and the volumetric parameters achieved during mix design are discussed. Asphalt concrete production and the placing procedures are also discussed. Finally, the paper recommends the measures to be taken when using coralline aggregates for asphalt concrete production.本文针对坦桑尼亚桑给巴尔机场改扩建工程中用于沥青粘结层（asphalt binder course）生产的珊瑚集料（coralline aggregates），阐述了其非常规工程特性。文中讨论了珊瑚集料的岩土（geotechnical）与岩土力学（geomechanical）特性、沥青混凝土（asphalt concrete）配合比设计方案，以及配合比设计过程中得到的体积参数；同时还探讨了沥青混凝土的生产工艺与摊铺作业流程。最后，本文提出了采用珊瑚集料制备沥青混凝土时应采取的相关措施。