Concrete having a low cement content

A concrete composition comprising:

• i) from 350 kg/m3 to 550 kg/m3 of at least one hydraulic binder comprising:
• from 20% to 40% of Portland clinkers having a particle dimension D50 of greater than 11 μm and a Blaine specific surface area of less than or equal to 5500 cm2/g,
• from 45% to 75% of fillers having a particle dimension D70 of less than or equal to 63 μm, and
• from 5% to 15% of an ultrafine particle size material having a BET specific surface area of greater than or equal to 5 m2/g or a D50 of less than or equal to 8 μm, and chosen from hydraulic additives, pozzolanic additives, ultrafine cements, or mixtures of two or more thereof,
• ii) at least 0.05% of superplasticizers or plasticizers,
• iii) water in a mass ratio of water to binders ranging from 0.3 to 0.45, and
• iv) aggregates,
• wherein all amounts are by weight, relative to the total weight of the hydraulic binders.

A method for preparing a concrete composition, the method comprising preparing a mixture by mixing:

• i) from 350 kg/m3 to 550 kg/m3 of at least one hydraulic binder comprising:
• from 20% to 40% of Portland clinkers having a particle dimension D50 of greater than 11 μm and a Blaine specific surface area of less than or equal to 5500 cm2/g,
• from 45% to 75% of fillers having a particle dimension D70 of less than or equal to 63 μm, and
• from 5% to 15% of an ultrafine particle size material having a BET specific surface area of greater than or equal to 5 m2/g or a D50 of less than or equal to 8 μm, and chosen from hydraulic additives, pozzolanic additives, ultrafine cements, or mixtures of two or more thereof,
• ii) at least 0.05% of superplasticizers or plasticizers,
• iii) water in a mass ratio of water to binders ranging from 0.3 to 0.45, and
• iv) aggregates,
• wherein the concrete composition has an Abrams cone slump of greater than or equal to 160 mm at a temperature of 20° C. after mixing components (i) to
• (iv) and a viscosity of less than or equal to 9 seconds at a temperature of 20°° C. after mixing,
• wherein all amounts are by weight, relative to the total weight of the hydraulic binders, and
• wherein the weight ratio of Portland clinkers to fillers ranges from at least 0.32.