EARLY AGE ULTRA-HIGH-PERFORMANCE NON-FIBER CONCRETE (UHPC)

Abstract

The present invention relates to a new composition of fiber-free Ultra High Performance Concrete (UHPC) capable of achieving high mechanical strength within the first few hours of placement. This formulation is based on the use of Portland cement, representing between 25% and 30% of the total mass, enriched with clinker and optionally supplemented with materials such as fly ash or pozzolans, which contribute to improving its properties. The aggregates, representing between 55% and 60% of the total mass, are carefully selected and include fine silica sand and gravel with a specific particle size, ensuring maximum compactness and low porosity. Latest-generation superplasticizers are incorporated into the formulation to effectively reduce the water / cement (W / C) ratio while increasing the fluidity of the mix. These admixtures give the concrete self-placeability, eliminating the need for mechanical vibration and facilitating its application in complex formwork or hard-to-reach environments. In addition, specific additives such as silica fume, an ultra-fine material, reinforce the density of the concrete, improve its mechanical properties and increase its durability against chemical and climatic attacks.