engleski

A study on the chloride diffusion and microstructure of alkali-activated mortar

The demand for durable building materials has become a compelling environmental issue due to the CO2 emissions associated with the production of ordinary Portland cement (OPC) for the repair or replacement of damaged infrastructure. Alkali- activated materials (AAMs) can offer high durability properties with low carbon emissions. However, knowledge on the diffusion of chloride anions in AAMs remains limited. Various contradictory results can be found in the literature, and findings from studies on OPC or even blended cements cannot be directly applied to AAMs due to the differences and complexity of this system. The study considered nine mix design based on different feedstocks (blast furnace slag for high Ca systems and fly ash for low Ca systems) and activated with different Na2O concentration in the alkali activator solution. The aim of the study was to establish a correlation between the microstructure and chloride diffusion, using NT BUILD 443 and data obtained by MIP curves.

Alkali-activated materials ; chloride diffusion ; microstructure ; porosity ; critical pore radius

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