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Effects of binders characteristics and concrete dosing parameters on the chloride diffusion coefficient

2021; Elsevier BV; Volume: 122; Linguagem: Inglês

10.1016/j.cemconcomp.2021.104114

1873-393X

Daniel Véras Ribeiro, Silas de Andrade Pinto, Nilson S. Amorim Júnior, José da Silva Andrade Neto, Ivan H.L. Santos, Saulo L. Marques, Mavisson Júlio Santos de França,

Concrete Properties and Behavior

Rebar corrosion in reinforced concrete is one of the most serious manifestations that affect structures, resulting in considerable technical, financial, and social consequences. The corrosive process can be accelerated by carbonation or the action of chlorides, the latter being the phenomenon of greatest concern, since a large part of the world population lives close to a coast. This study analyzed how the characteristics of the cement and the dosing parameters of the concrete influence the diffusion of chlorides in both an isolated and in a combined manner. For this, several concretes were dosed with different water/cement and water/binder ratios, types of cement, mortar content, and mineral additions, each of which had their individual diffusion coefficients obtained from the chloride migration test. It was observed that the water/cement ratio is not the primary parameter for controlling the diffusion of chlorides in concrete. The aluminate content, the fineness of the cement used, and the water/binder ratio, more significantly affect chloride diffusion. • Effects of raw material characteristics and dosing parameters on chloride diffusion in concretes. • Properties of concretes were produced with various cements and additives. • Correlations between the raw materials properties and the chloride diffusion coefficient (D ns) . • Correlations between concrete properties and the D ns . • Al 2 O 3 content, water/binder ratio, and porosity, are the primary influencers of D ns .