Method and composition for fabricating concrete elements having remarkable compression resistance and fracturation energy, and elements thus obtained

摘要

The invention relates to a preparation of a concrete having a compression resistance of at least 400 MPa and a fracturation energy of at least 1 000 J/m2. A mix containing substantially cement, fine sand, amorphous silica, crushed quartz, steel wool, a fluidifying agent and water in specific proportions is mixed and, after setting, the concrete is fired at a temperature of at least 250 °C. The figure is a micrography showing the microstructure of concrete according to the invention. The invention provides particularly for the making of concrete parts in replacement of steel, for example anchoring heads for prestressed cables.