Lafarge

Philippe Fonollosa

Gilles Chanvillard

Mouloud Behloul

Jean-François Batoz

Jeffrey Chen

Stéphane Rigaud

Stephane Rigaud

A binder premix includes from 0.2% to 63% of a material of an ultrafine particle size category, including individual particles with a D90 value less than 1 &#x3bc;m and/or with a BET specific surface greater than 5 m/g; from 8% to 63% of selected Portland cement including particles with a D90 value less than 30 &#x3bc;m and from 25% to 85% of a material, other than the cement, of a fine particle size category, including particles for which the D10 and D90 values are from 1 &#x3bc;m to 120 &#x3bc;m and with a BET specific surface less than 5 m/g. A binder mix including, in addition to the premix, a material of a medium particle size category, including particles for which the D10 and D90 values are from 120 &#x3bc;m to 5 mm is disclosed.

High or ultra-high performance concrete

A ductile ultra-high performance concrete which includes in relative parts by weight: 100 of Portland cement; 50 to 200 of a sand having a single grading with a D1O to D90 between 0.063 and 5 mm, or a mixture of sands, the finest sand having a D1O to D90 between 0.063 and 1 mm and the coarsest sand having a D1O to D90 between 1 and 5 mm; 0 to 70 of a particulate pozzolanic or non-pozzolanic material or a mixture thereof having a mean particle size less than 15 &#x3bc;m; 0.1 to 10 of a water-reducing superplasticizer; 10 to 30 of water; and 0.5 to 5% by volume relative to the volume of the hardened composition of glass fibers having an aspect ratio of 6 to 120.

Concrete composition

A concrete which includes in parts by weight: 100 Portland cement; 50 to 200 of a sand having a single grading with a D10 to D90 between 0.063 and 5 mm, or a mixture of sands, the finest sand having a D10 to D90 between 0.063 and 1 mm and the coarsest sand having a D10 to D90 between 1 and 4 mm; 10 to 50 of a particulate, substantially non-pozzolanic material having a mean particle size less than 15 &#x3bc;m; 0.1 to 10 of a water-reducing superplasticizer; and 10 to 30 of water; which concrete is substantially free of silica fume; the concrete having a compressive strength greater than 100 Mpa at 28 days.

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Cremieu, France

Philippe Fonollosa