Geopolymer with nanoparticle retardant and method
AssigneeLouisiana Tech Research Corporation
InventorsErez Allouche, Yuri Lvov, Carlos Montes, Anupam Joshi
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Abstract
A method of controlling the setting time of a geopolymer by coating aluminosilicate particles with nanoparticles to slow the geopolymerization reaction. The coating effectiveness of the nanoparticles may be enhanced by pretreating the aluminosilicate particles with a layer-by-layer assembly of polyelectrolytes. A geopolymer is formed by mixing about 39% to about 66% by weight aluminosilicate source, about 0% to about 40% by weight sand, about 19% to about 33% by weight of alkali activator solution, and about 1% to about 4% nanoparticles.
Claims9
A method of controlling the setting time of a geopolymer, comprising the steps of:
- a) partially or completely coating aluminosilicate particles with nanoparticles;
- b) then mixing the coated aluminosilicate particles with sodium silicate and a sodium hydroxide solution to form a geopolymer through a geopolymerization reaction, wherein the nanoparticles retard the geopolymerization reaction.
A method of preparing a geopolymer, comprising the steps of:
- a) mixing aluminosilicate particles with nanoparticles to form a first mixture in which the nanoparticles partially or completely coat the aluminosilicate particles, wherein the aluminosilicate particles form about 39% to about 66% by weight of the geopolymer, and wherein the nanoparticles form about 1% to about 4% by weight of the geopolymer;
- b) mixing sodium silicate with the first mixture to form a second mixture, wherein the sodium silicate forms about 11% to about 20% by weight of the geopolymer;
- c) mixing a sodium hydroxide solution with the second mixture until a substantially homogeneous mixture is achieved, wherein the sodium hydroxide solution forms about 7% to about 14% by weight of the geopolymer.
Dependencies are inferred from the claim text.