Lightweight concrete with low thermal ­conductivity

(10) US 2015/0203406 A1

(22) 05.07.2015

(43) 23.07.2015

(71) Lafarge, Paris

(57) A concrete includes cement; effective water; aggregates (G1) having a maximum size of 20 mm and a real density (ρ1) of 450 to 1,200 kg/m3; optionally aggregates (G2) having a maximum size of 4 mm and a real density (ρ2), such, that the real density (p) of the mixture (Gl)+(G2) is comprised from 450 to 1,200 kg/m3 with
1/ρ=ml/(ρ1)+m2/(ρ2) ml and m2 respectively being the mass fractions of (Gl) and (G2); the concrete having (a) a density in the fresh state of 800 to 1,500 kg/m3, (b) a Weffectiv/Beqratio varying from...

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