METHOD AND A COMPOSITION FOR PREPARING CONCRETE ELEMENTS HAVING REMARKABLE COMPRESSIVE STRENGTH AND FRACTURE ENERGY

摘要

The present invention relates to the production of concrete having a compression resistance of at least 400 MPa and a fracture energy of at least 1,000 J / m ² . After mixing and setting the mixture containing substantially cement, fine sand, amorphous silica, crushed quartz, steel wool, glidant and water in a specific proportion, the concrete is heated at a temperature of at least 250 ° C. The figure is an electron micrograph showing the microstructure of the concrete according to the present invention. The invention is used in particular for the production of concrete parts of anchoring heads, for example for compressive stress cables, instead of steel.