engleski

Correlating chloride migration, diffusion and resistivity of limestone calcined clay mortar based on low grade clay

Recent years, a potential blended cement - which is a combination of calcined clay and limestone has been promoted as a promising choice among conventional SCMs. However, high grade kaolin clays are not easily available everywhere or they have a more favourable application. One of the possibilities to consider is using low grade kaolin clays, more easily available in sufficient quantities for cement industry. This paper discusses the durability performance of cementitious systems based on low kaolin clays collected in South-East region of Europe. Chloride penetration resistance was evaluated by chloride migration test (NT BUILD 492) and chloride diffusion test (NT BUILD 443) along with the surface resistivity using Wenner probe method. Thereafter, chloride transport coefficients from both tests were correlated with their corresponding surface resistivity. Chloride diffusion coefficients of limestone-calcined clay systems were found to be lower than chloride migration coefficients, and migration coefficients were strongly influenced by the electrical resistivity of the system.

Calcined clay cement, Chloride migration coefficients, Chloride diffusion coefficients, Surface resistivity

nije evidentirano