DURABILITY OF SUSTAINABLE TERNARY BLENDED CONCRETE CONTAINING BLAST FURNACE SLAG AND LIMESTONE FILLER

In the present paper, the physical-mechanical and durability properties of a concrete designed according to sustainable parameters (64% OPC + 30% BFS + 6% LF) is compared with a reference concrete (100% OPC). Results show that the ternary concrete is able to achieve similar mechanical properties than the reference at 28 days but overpass the OPC at longer curing ages. The reason of this is attributed to the generation of a more refined pore structure, outcome of the differences in hydration evolution. The durability performance depends on the nature of the aggressive under consideration: 1) Water capillary absorption coefficient is lower in ternary blended concrete as consequence of the refinement of the pore structure, 2) Carbonation rate of ternary blended concrete is higher regardless of the curing length, 3) The chloride transport is delayed with ternary blended concrete, confirmed with chloride diffusion coefficient (migration) and after natural diffusion penetration in saturated conditions.