Acceleration of the hardening of blast furnace slag based binders for precast concrete products

The reported study aims to propose industrially viable solutions in order to accelerate the hardening of ground granulated blast furnace slag in precast concrete products thanks to both chemical and thermal activations. These solutions also have to be durable and environmentally friendly at the same time.

More precisely, concrete with high content of slag should reach equivalent short term performance to CEM I 52.5 Portland cement based concrete, when placed in representative conditions of precast concrete industry. Thus, chemical activation of slag only or blended with Portland cement has been the main subject of the experimental works carried out on mortars in order to reach the obejctive previously defined.

On condition that their durability is validated, the solutions that have been developed are by several aspects more advantageous than the CEIM I 52.5 Portland cement based reference.

Keywords: Blast furnace slag, Durability, Hardening