Geopolymery - zkusenosti ?
Napsal: 25. 8. 2013, 8:52
Ahoj vsem,
zaregistroval jsem ze par jedincu zminilo ze ma alespon nejake zkusenosti s geopolymery.
Myslim ze napr. QNX. V minulosti jsem s kolegy tvoril dalo by se rict plastiky, na ktere by podobny material mohl byt uzitecny, a samozrejme i mozna na konstrukci CNC masinek.
Po precteni nekolika dokumentu jako napr. v priloze me zajima primarne nekolik veci -
1) ma nekdo konkretni zkusenost s hotovym materialem, napr =
http://www.cluz.cz/?page=en,geopolymery" onclick="window.open(this.href);return false;
nebo nejakou materialove dostupnou recepturu ?
2) pevnost v tahu by mela byt AZ 1:2 vuci pevnosti v tlaku + pevnost AZ 160MPa = ca jako dobry polymerbeton, alespon postrehy ?
3) udajne nulove smrsteni ?
1. The structure of the geopolymers prepared on the basis of fly ashes is
predominantly of the AlQ4(4Si) type and SiQ4(4Al), SiQ4(2-3Al).
2. The geopolymer on the basis of fly ashes is a porous material. The porosity
of the geopolymers is very similar in the region of nano-pores regardless of
the conditions of their preparation. The geopolymers’ strength is affected
substantially by macro-pores (103 nm and more) formed in result of the air
entrained into the geopolymers; these may also be fly ash particles that
underwent only partial reaction. The presence of Ca-containing additives
(slag, gypsum) reduces considerably the porosity because of the co-existence
of the geopolymer phase with the C-S-H one.
3. A concrete can be prepared by using the geopolymer binder. No shrinkage
due to hydration (typical for the cement-based concretes) takes place in the
concrete. The ratio of the compressive strength to the tensile strength under
bending varies in the range of 10.0 : 5.5 (this ratio changes in the cementbased
concrete from 10:1.) to 10.):1.5). The strength values of the
geopolymer concrete increase in the long run.
4. Rheological properties of concretes differ from those of Portland cement.
5. The geopolymer concrete is resistant to the corrosive environments.
6. No transition phase with a different composition as this is typical for
concretes on the basis of Portland cement was found between the
geopolymers and the aggregate (reinforcement).
zaregistroval jsem ze par jedincu zminilo ze ma alespon nejake zkusenosti s geopolymery.
Myslim ze napr. QNX. V minulosti jsem s kolegy tvoril dalo by se rict plastiky, na ktere by podobny material mohl byt uzitecny, a samozrejme i mozna na konstrukci CNC masinek.
Po precteni nekolika dokumentu jako napr. v priloze me zajima primarne nekolik veci -
1) ma nekdo konkretni zkusenost s hotovym materialem, napr =
http://www.cluz.cz/?page=en,geopolymery" onclick="window.open(this.href);return false;
nebo nejakou materialove dostupnou recepturu ?
2) pevnost v tahu by mela byt AZ 1:2 vuci pevnosti v tlaku + pevnost AZ 160MPa = ca jako dobry polymerbeton, alespon postrehy ?
3) udajne nulove smrsteni ?
1. The structure of the geopolymers prepared on the basis of fly ashes is
predominantly of the AlQ4(4Si) type and SiQ4(4Al), SiQ4(2-3Al).
2. The geopolymer on the basis of fly ashes is a porous material. The porosity
of the geopolymers is very similar in the region of nano-pores regardless of
the conditions of their preparation. The geopolymers’ strength is affected
substantially by macro-pores (103 nm and more) formed in result of the air
entrained into the geopolymers; these may also be fly ash particles that
underwent only partial reaction. The presence of Ca-containing additives
(slag, gypsum) reduces considerably the porosity because of the co-existence
of the geopolymer phase with the C-S-H one.
3. A concrete can be prepared by using the geopolymer binder. No shrinkage
due to hydration (typical for the cement-based concretes) takes place in the
concrete. The ratio of the compressive strength to the tensile strength under
bending varies in the range of 10.0 : 5.5 (this ratio changes in the cementbased
concrete from 10:1.) to 10.):1.5). The strength values of the
geopolymer concrete increase in the long run.
4. Rheological properties of concretes differ from those of Portland cement.
5. The geopolymer concrete is resistant to the corrosive environments.
6. No transition phase with a different composition as this is typical for
concretes on the basis of Portland cement was found between the
geopolymers and the aggregate (reinforcement).
