Alkali-activated binder with waste photovoltaic glass powder and blast furnace slag as precursors: Performance study, shrinkage- reducing technology and mechanism analysis

A new type of alkali-activated material (AAM) was developed for the first time by using waste photovoltaic glass powder (WPGP), blast furnace slag (BFS) and three kinds of shrinkage- reducing materials (CaO-MgO composite expansion agent (CMEA), hydroxypropyl methylcellulose (HPMC) and polyacrylamide (PAM)). The processability (setting time and fluidity), mechanical properties and long-term properties (drying shrinkage) of 10 groups of AAMs were investigated. The effect mechanism of three shrinkage-reducing materials on the properties and microstructure of AAM were revealed by X-ray diffraction (XRD), fourier transform infrared spectroscopy (FTIR), differential thermal gravity-thermal gravity (DTG-TG), and scanning electron microscope (SEM). The results showed that the shrinkage reduction effect of PAM was the most satisfactory, and the drying shrinkage of AAM was the most significantly reduced by 34.48%. The reduction effect of CMEA was limited, but it was very significant in improving the mechanical properties of AAM.