Cementitious compositions having biomass ashes, especially bagasse ashes, and uses thereof

Patent metadata

Field	Value
Publication number	US-2025011237-A1
Application number	US-202318712374-A
Country	US
Kind code	A1
Filing date	Jan 10, 2023
Priority date	Jan 19, 2022
Publication date	Jan 9, 2025
Grant date	—

Abstract

Cementitious compositions and uses of such cementitious compositions especially as tile adhesive, the compositions including or consisting of a) a hydraulic binder itself including (in each case relative to the total dry weight of hydraulic binder) ai) 50-92 w %, preferably 70-77.55 w % of Ordinary Portland Cement, aii) 5-50 w %, preferably 21-30 w % of biomass ash, preferably bagasse ash, b) 0.01-0.5 w %, preferably 0.1-0.45 w % (relative to the total dry weight of the cementitious composition) of cellulose ether, c) optionally 0.05-2.5 w %, preferably 0.1-1 w % (relative to the total dry weight of the cementitious composition) of redispersible polymer powder, and d) optionally at least one activator selected from alkali metal or alkaline earth metal salts of hydroxide, formate, chloride, sulphate, and/or nitrate.

First claim

1 . A cementitious composition comprising or consisting of
a) a hydraulic binder itself comprising (in each case relative to the total dry weight of hydraulic binder) ai) 50-92 w % of Ordinary Portland Cement, aii) 5-50 w % of biomass ash, b) 0.01-0.5 w % (relative to the total dry weight of the cementitious composition) of cellulose ether, c) optionally 0.05-2.5 w % (relative to the total dry weight of the cementitious composition) of redispersible polymer powder, and d) optionally at least one activator selected from alkali metal or alkaline earth metal salts of hydroxide, formate, chloride, sulphate, and/or nitrate.

2 . The cementitious composition according to claim 1 , wherein the biomass ash is bagasse ash or cashew nutshell ash.

3 . The cementitious composition according to claim 1 , wherein the cellulose ether is selected from methylhydroxypropylcellulose ether or methylhydroxyethylcellulose ether.

4 . The cementitious composition according to claim 1 , wherein the redispersible polymer powder is based on a copolymer of vinyl acetate and ethylene and has a glass transition temperature of between −5-+15° C.

5 . The cementitious composition according to claim 1 , wherein it additionally comprises 0.05-1 w % (relative to the total dry weight of the cementitious composition) of at least one superplasticizer selected from the group consisting of lignosulfonates, sulfonated vinyl copolymers, polynaphthalene sulfonates, sulfonated melamine formaldehyde condensates, polyethylene oxide phosphonates, polycarboxylate ethers (PCE).

6 . The cementitious composition according to claim 1 , wherein the biomass ashes have a particle size of not more than 0.6 mm as measured by sieve analysis.

7 . A kit comprising in a first compartment A a cementitious composition comprising or consisting of
a) a hydraulic binder itself comprising (in each case relative to the total dry weight of hydraulic binder) ai) 50-92 w % of Ordinary Portland Cement, aii) 5-50 w % of biomass ash, b) 0.01-0.5 w % (relative to the total dry weight of the cementitious composition) of cellulose ether, c) optionally 0.05-2.5 w % (relative to the total dry weight of the cementitious composition) of redispersible polymer powder, and d) optionally at least one activator selected from alkali metal or alkaline earth metal salts of hydroxide, formate, chloride, sulphate, and/or nitrate, and in a second compartment B comprising water, wherein the first compartment A and the second compartment B are spatially separated.

8 . A tile adhesive comprising the cementitious composition as claimed in claim 1 .

9 . A method of tiling a surface, the method comprising the steps of
a) preparing a surface S, b) providing a cementitious composition as claimed in claim 1 , c) mixing the cementitious composition with water to provide a wet mix or mixing the compartments A and B of the kit to provide a wet mix, d) applying the wet mix obtained in step c) onto the surface S, e) applying a tile on top of the wet mix applied to the surface S in step d), f) hardening the assembly obtained in step e).

10 . A waterproofing mortar comprising the cementitious composition as claimed in claim 1 .

Assignees

• Sika Tech Ag

Inventors

• Pascual Thomas

Classifications

• C04B2111/27

  Water resistance, i.e. waterproof or water-repellent materials · CPC title

• C04B2111/00637

  as glue or binder for uniting building or structural materials · CPC title

• C04B2103/32

  Superplasticisers · CPC title

• C04B2103/10

  Accelerators; Activators · CPC title

• C04B2103/0054

  Water dispersible polymers · CPC title