Discussion of the paper “Characterisation of magnesium potassium phosphate cement blended with fly ash and ground granulated blast furnace slag” by L.J. Gardner et al.

A recently published paper authored by Gardner et al. [Characterisation of magnesium potassium phosphate cement blended with fly ash and ground granulated blast furnace slag, Cem. Concr. Res. 74 (2015) 78-87] is discussed. This work is of great significance in understanding the reaction mechanism of magnesium potassium phosphate cement blended with supplementary cementitious materials. However, several points in this work need to be further discussed, as shown in this discussion, including the mix proportion, paste morphology, mechanism of the synergy between MKPC and fly ash/ground granulated blast furnace slag.