ABSTRACT
With high early strength and excellent durability, slag fly ash-based geopolymer (SFGPC) can be widely applied as a pavement construction repair material. It can significantly shorten the time of operation, improve the continuous service life of the concrete pavement and save the cost of pavement rehabilitation projects. In this paper, the basic mechanical properties of SFGPC and its bonding performance with existing concrete are investigated, with the study focusing on the effects of different roughness, adhesion agents, SFGPC strength, and existing concrete strength on the bonding strength. The main conclusions are as follows: (1) SFGPC exhibits outstanding early compressive properties and can meet the requirements for the repair of concrete structures. (2) Excessive or low roughness at the bonding interface is not conducive to the bonding of SFGPC to existing concrete. (3) The bonding properties of the adhesion agent are, in descending order, slag-fly ash paste, none, slag-fly ash mortar, and fly ash paste. (4) The bonding strength increases with higher grades of existing concrete and SFGPC.
