Fly ash cementitious compositions
AssigneeWashington State University
InventorsXianming Shi, Gang Xu
Life of this patent
Estimating the term…
Abstract
A composition comprising: (a) fly ash cementitious binder; and (b) a chemical activator selected from sodium silicate, potassium silicate, sodium sulfate, sodium phosphate, calcium sulfate, potassium sulfate, potassium phosphate, CaO, Fe2O3, sodium chloride, calcium chloride, fine fraction of concrete waste from construction or demolition, cement kiln dust, or a combination thereof, wherein the fly ash is the only cementitious binder present in the composition and the CaO activator, if present, is present in an amount ≤10 weight percent, based on the total dry weight of the composition.
Claims35
A composition comprising:
- (a) fly ash cementitious binder;
- (b) at least one of sodium silicate activator or potassium silicate activator;
- (c) at least one of sodium sulfate activator, potassium sulfate activator, calcium sulfate activator, sodium phosphate activator, or potassium phosphate activator;
- (d) at least one of CaO activator, Fe2O3 activator, fine fraction of concrete waste from construction or demolition activator;
- and
- (e) at least one of calcium chloride activator or sodium chloride activator,
- wherein the fly ash is the only cementitious binder present in the composition and the CaO activator, if present, is present in an amount of ≤10 weight percent, based on the total dry weight of the composition.
A composition comprising:
- (a) fly ash cementitious binder, wherein the fly ash comprises greater than 10 weight percent CaO, based on the total dry weight of the fly ash;
- and
- (b) graphene oxide in an amount of 0.01 to 0.10 weight percent, based on the total dry weight of the composition,
- wherein the fly ash is the only cementitious binder present in the composition.
A method comprising;
- (i) forming a mixture of (a) fly ash cementitious binder;
- (b) at least one of sodium silicate activator or potassium silicate activator;
- (c) at least one of sodium sulfate activator, potassium sulfate activator, calcium sulfate activator, sodium phosphate activator, or potassium phosphate activator;
- (d) at least one of CaO activator, Fe2O3 activator, fine fraction of concrete waste from construction or demolition activator;
- and (e) at least one of calcium chloride or sodium chloride activator, wherein the fly ash is the only cementitious binder present in the composition and the CaO activator, if present, is present in an amount of ≤10 weight percent, based on the total dry weight of the composition;
- and
- (ii) curing the mixture at ambient temperature and ambient pressure.
A method comprising:
- (i) forming a mixture of (a) fly ash cementitious binder, wherein the fly ash comprises greater than 10 weight percent CaO, based on the total dry weight of the fly ash and (b) graphene oxide in an amount of 0.01 to 0.10 weight percent, based on the total dry weight of the composition, wherein the fly ash is the only cementitious binder present in the composition;
- and
- (ii) curing the mixture at ambient temperature and ambient pressure.
A composition comprising:
- (a) a Class C fly ash cementitious binder;
- (b) a chemical activator consisting of sodium silicate, potassium silicate, sodium sulfate, sodium phosphate, calcium sulfate, potassium sulfate, potassium phosphate, CaO, Fe2O3, sodium chloride, calcium chloride, fine fraction of concrete waste from construction or demolition, cement kiln dust, or a combination thereof;
- and
- (c) graphene oxide,
- wherein the Class C fly ash is the only cementitious binder present in the composition and the CaO activator, if present, is present in an amount of ≤10 weight percent, based on the total dry weight of the composition.
Dependencies are inferred from the claim text.