Abstract: Lime-fly ash-ordinary portland cement stabilized macadam is a common pavement base material, but its early strength is low. So, it cannot be used for the opened traffic swiftly. In order to enhance the early strength of stabilized macadam, ordinary Portland cement is substituted by sulfoaluminate cement with equal quality. The unconfined compressive strength (UCS) and split tensile strength (STS) of two kinds of cement stabilized macadam were compared by unconfined compressive strength test (UCT) and split tensile strength test (STS). At the same time, experimental research on the influence of inorganic binder content, cement content and grade-pairing strength of the macadam was carried out. The results show that the UCS and STS of stabilized macadam increase with the increase of cement content and curing age. The UCS of lime-fly ash-sulfoaluminate cement stabilized gravel in the curing period of 1 day can reach to 2.28 MPa, which meets the requirements of the road base open traffic with the strength not decreasing in the later period.A new material for quick maintenance of pavement base course is provided here.

Key words: road base, lime-fly ash-cement stabilized macadam, unconfined compressive strength, split tensile strength