Combinations of SO3, limestone and pozzolana

In the ongoing evolution of cement technology, small compositional adjustments continue to unlock disproportionately large performance gains. The growing use of limestone and supplementary cementitious materials, particularly calcined clays, has already reshaped our understanding of hydration chemistry, moving beyond the traditional boundaries of ordinary Portland cement. Yet, these systems are not governed by isolated reactions, but by a tightly interdependent network in which silica, alumina, carbonate and sulphate species compete and cooperate in complex ways. By Arthur Harrisson, UK