SOUND-ABSORBING, RESISTANT PANELS AND PROCESS FOR MAKING SAME
A composition includes a set hydraulic binder; and a foaming agent and has a porosity ≧0.55; a flow resistivity between 10000 and 200000 N.s.m-4; a tortuosity between 1.2 and 3.4; a viscous characteristic length between 10 μm and 60 μm; a thermal characteristic length between 60 μm and 1000 μm; and a compressive strength of at least 0.30 MPa as measured by modified ASTM C472.
1 . A composition comprising:
a set hydraulic binder; and
a foaming agent
and having
a porosity ≧0.55;
a flow resistivity between 10000 and 200000 N.s.m-4;
a tortuosity between 1.2 and 3.4;
a viscous characteristic length between 10 μm and 60 μm;
a thermal characteristic length between 60 μm and 1000 μm;
and
a compressive strength of at least 0.30 MPa as measured by modified ASTM C472.
2 . The composition of claim 1 , wherein the set hydraulic binder is set gypsum plaster.
3 . The composition of claim 1 , wherein the foaming agent is a glycoside compound.
4 . The composition of claim 3 , wherein the glycoside compound is a C4-C16 alkylpolyglycoside or C4-C16 alkylpolyglucoside.
5 . The composition of claim 3 , wherein the composition comprises from 0.1 to 2.0 wt % of the glycoside compound.
6 . The composition of claim 3 , wherein the glycoside compound is the sole foaming agent.
7 . The composition of claim 1 , wherein
the porosity is ≧0.70;
the flow resistivity is between 50000 and 180000 N.S.m-4;
the tortuosity is between 1.3 and 2.5;
the viscous characteristic length is between 15 μm and 50 μm;
the thermal characteristic length is between 70 μm and 500 μm.
8 . The composition of claim 1 , wherein
the porosity is ≧0.76;
the flow resistivity is between 100000 and 160000 N.s.m-4;
the tortuosity is between 1.4 and 2.3;
the viscous characteristic length is between 15 μm and 40 μm;
the thermal characteristic length is between 80 μm and 300 μm.
9 . A panel comprising a core, wherein said core comprises a composition according to claim 1 .
10 . The panel of the claim 9 , wherein said panel is a sound-absorbing panel.
11 . A sound-absorbing panel comprising a core, wherein said core comprises a set hydraulic binder and a glycoside compound.
12 . The sound-absorbing panel of claim 11 , wherein the set hydraulic binder is set gypsum plaster.
13 . The sound-absorbing panel of claim 12 , wherein the set gypsum plaster is set flue gas desulphurization gypsum plaster.
14 . The sound-absorbing panel of claim 11 , wherein the glycoside compound is an alkylpolyglycoside or alkylpolyglucoside.
15 . The sound-absorbing panel of claim 14 , wherein the glycoside compound is GLUCOPON 600 CSUP or GLUCOPON 215 CS UP.
16 . The sound-absorbing panel of claim 11 , wherein the core comprises from 0.1 to 2.0 wt % glycoside compound.
17 . The sound-absorbing panel of claim 11 , having a compressive strength of at least 0.30 MPa as measured by modified ASTM C472, and a sound absorption average of at least 0.65 as measured by modified ASTM E1050-98.
18 . A process of making a sound-absorbing panel, comprising:
pre-mixing a set hydraulic binder with water;
adding a glycoside compound to the pre-mixed set hydraulic binder with water to obtain a shiny;
injecting air into the obtained slurry and mixing.
casting the aerated slurry;
setting the cast slurry.
19 . The process of claim 18 , wherein the set hydraulic binder is gypsum plaster.
20 . The process of claim 18 , wherein the glycoside compound is an alkylpolyglycoside or alkylpolyglucoside.
21 . The process of claim 20 , wherein the glycoside compound is a C4-C16 alkylpolyglycoside or a C4-C16 alkylpolyglucoside.
22 . The process of claim 18 , wherein the pre-mixing comprises pre-mixing the set hydraulic binder with water and a blocking agent.
23 . The process of claim 18 , comprising introducing an unblocking agent into the aerated slurry.
24 . The process of claim 18 , wherein the pre-mixing comprises pre-mixing the set hydraulic binder with water and a retarding agent.
25 . The process of claim 18 , wherein the casting of the aerated slurry comprises depositing the aerated slurry onto a facer, said process also comprising: covering the deposited slurry with another facer, forming a ribbon from the deposited slurry, and cutting the ribbon into panels.
26 . The process of claim 18 , comprising depositing the aerated slurry into moulds.
27 . An assembly comprising the panel according to claim 9 , a coating and a fixing system.
28 . A partition comprising a frame, a gypsum board and a panel comprising the composition according to claim 1 .
29 . An acoustic insulated system comprising a composition according to claim 1 .
30 . The composition of claim 3 , wherein the glycoside compound is alkylpolyglycoside or alkylpolyglucoside.