Preparation of potassium methylsilicate modified one-part alkali-activated slag grouting material and its effect on adhesion properties of semi-flexible pavement

Because of the opposite polarities of the alkali-activated slag grouting material and the asphalt mixture, their successful combination is challenging. In this study, a small molecular surfactant, viz. potassium methylsilicate (PMS), was used to modify the grouting material. The results showed that PMS is stable in the one-part alkali-activated slag grouting material and can bind to the end of the gel. When 6% PMS was added, the contact angle between the grouting material and SBS-modified asphalt was 55.6 degrees, a 41.60% reduction in contact angle compared with that obtained when unmodified grouting material was used. Moreover, owing to the presence of CH3, there is a complete Interface transition zone (ITZ) between the modified grouting material and the asphalt mixture and the grouting saturation is above 90%. Although PMS modification can reduce the Marshall stability and increase flow value of the SFP, it can still meet the technical requirements of the SFP.