US 11,878,942 B2Granted

Cementitious compositions with accelerated curing at low temperatures

AssigneeSika Technology AG

InventorsAndrea Lucero, Mohamed Cader, Flaviane Alves Dos Santos

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Abstract

A cementitious composition with accelerated curing at low temperatures particularly at temperatures <5° C., especially at temperatures <0° C. The cementitious composition consists of 2 components with a first component A including at least one ordinary Portland cement, at least one cement selected from calcium aluminate cement and/or calcium sulfoaluminate cement, a powder P, selected from the group consisting of carbonates or hydrogen carbonates of alkali and/or alkaline earth metals, optionally aggregates, optionally other additives and a second component B comprising at least one accelerator, an anti-freeze agent, water, and optionally other additives. The composition shows increased development of compressive strength, maintain good workability, and have particularly low shrinkage, also when cured at temperatures <5° C., especially <0° C., and as low as −10° C.

Claims15

Dependent claims

A cementitious composition essentially consisting of a first component A comprising

a) 15-69 w % of at least one ordinary Portland cement (OPC),
b) 1-25 w % of at least one cement selected from calcium aluminate cement (CAC) and/or calcium sulfoaluminate cement (CSA),
c) 0.1-15 w % of a powder P, selected from the group consisting of carbonates or hydrogen carbonates of alkali and/or alkaline earth metals,
d) optionally 30-70 w % of aggregates,
e) optionally 1-15 w % of other additives selected from the group of plasticizers, superplasticizers, rheology modifiers, retarders, air-entrainers, de-aerating agents, corrosion inhibitors, fibers, synthetic organic polymers, expansion producing additives, pigments, strength enhancers, waterproofing additives, alkali-aggregate reaction inhibitors, chromate reducers, and/or anti-microbial agents,
each based on the total weight of the component A,
and a second component B comprising
f) 30-90 w % of at least one accelerator selected from the group consisting of alkanolamines, halides, formats, acetates, oxalates, nitrites, nitrates, thiocyanates, sulphates, thiosulphates, glycerol, α-hydroxycarboxylic acids, and calcium aluminates,
g) 0.1-5 w % of an anti-freeze agent which is selected from the group of sodium chloride, urea, and glycols,
h) 10-70 w % of water, and
i) optionally other additives selected from the group of plasticizers, superplasticizers, rheology modifiers, retarders, air-entrainers, de-aerating agents, corrosion inhibitors, fibers, synthetic organic polymers, expansion producing additives, pigments, strength enhancers, waterproofing additives, alkali-aggregate reaction inhibitors, chromate reducers, and/or anti-microbial agents,
each based on the total weight of the component B.

9 more elements

A method for producing a shaped body, the method comprising the steps of

a) providing a component A that comprises:
i) 15-69 w % of at least one ordinary Portland cement (OPC),
ii) 1-25 w % of at least one cement selected from calcium aluminate cement (CAC) and/or calcium sulfoaluminate cement (CSA),
iii) 0.1-15 w % of a powder P, selected from the group consisting of carbonates or hydrogen carbonates of alkali and/or alkaline earth metals,
iv) optionally 30-70 w % of aggregates,
v) optionally 1-15 w % of other additives selected from the group of plasticizers, superplasticizers, rheology modifiers, retarders, air-entrainers, de-aerating agents, corrosion inhibitors, fibers, synthetic organic polymers, expansion producing additives, pigments, strength enhancers, waterproofing additives, alkali-aggregate reaction inhibitors, chromate reducers, and/or anti-microbial agents,
each based on the total weight of the component A,
b) providing a component B that comprises:
vi) 30-90 w % of at least one accelerator selected from the group consisting of alkanolamines, halides, formats, acetates, oxalates, nitrites, nitrates, thiocyanates, sulphates, thiosulphates, glycerol, (α-hydroxycarboxylic acids, and calcium aluminates,
vii) 0.1-5 w % of an anti-freeze agent which is selected from the group of sodium chloride, urea, and glycols,
viii) 10-70 w % of water, and
ix) optionally other additives selected from the group of plasticizers, superplasticizers, rheology modifiers, retarders, air-entrainers, de-aerating agents, corrosion inhibitors, fibers, synthetic organic polymers, expansion producing additives, pigments, strength enhancers, waterproofing additives, alkali-aggregate reaction inhibitors, chromate reducers, and/or anti-microbial agents,
each based on the total weight of the component B,
c) mixing component A and component B in a weight ratio of from 50:1 to 1:100 to obtain a mixed composition, and
d) producing the shaped body with the mixed composition.

12 more elements

A method for jointing of porous materials, the method comprising the steps of

a) providing a component A that comprises:
i) 15-69 w % of at least one ordinary Portland cement (OPC),
ii) 1-25 w % of at least one cement selected from calcium aluminate cement (CAC) and/or calcium sulfoaluminate cement (CSA),
iii) 0.1-15 w % of a powder P, selected from the group consisting of carbonates or hydrogen carbonates of alkali and/or alkaline earth metals,
iv) optionally 30-70 w % of aggregates,
v) optionally 1-15 w % of other additives selected from the group of plasticizers, superplasticizers, rheology modifiers, retarders, air-entrainers, de-aerating agents, corrosion inhibitors, fibers, synthetic organic polymers, expansion producing additives, pigments, strength enhancers, waterproofing additives, alkali-aggregate reaction inhibitors, chromate reducers, and/or anti-microbial agents,
each based on the total weight of the component A,
b) providing a component B that comprises:
vi) 30-90 w % of at least one accelerator selected from the group consisting of alkanolamines, halides, formats, acetates, oxalates, nitrites, nitrates, thiocyanates, sulphates, thiosulphates, glycerol, (α-hydroxycarboxylic acids, and calcium aluminates,
vii) 0.1-5 w % of an anti-freeze agent which is selected from the group of sodium chloride, urea, and glycols,
viii) 10-70 w % of water, and
ix) optionally other additives selected from the group of plasticizers, superplasticizers, rheology modifiers, retarders, air-entrainers, de-aerating agents, corrosion inhibitors, fibers, synthetic organic polymers, expansion producing additives, pigments, strength enhancers, waterproofing additives, alkali-aggregate reaction inhibitors, chromate reducers, and/or anti-microbial agents,
each based on the total weight of the component B,
c) mixing component A and component B in a weight ratio of from 50:1 to 1:100 to obtain a mixed composition,
d) optionally pretreating one or more of the surfaces of the porous materials to be joined, and
e) placing of the mixed composition on the one or more surfaces of the porous materials.

13 more elements

A method for repairing cementitious substrates, the method comprising the steps of

a) providing a component A that comprises:
i) 15-69 w % of at least one ordinary Portland cement (OPC),
ii) 1-25 w % of at least one cement selected from calcium aluminate cement (CAC) and/or calcium sulfoaluminate cement (CSA),
iii) 0.1-15 w % of a powder P, selected from the group consisting of carbonates or hydrogen carbonates of alkali and/or alkaline earth metals,
iv) optionally 30-70 w % of aggregates,
v) optionally 1-15 w % of other additives selected from the group of plasticizers, superplasticizers, rheology modifiers, retarders, air-entrainers, de-aerating agents, corrosion inhibitors, fibers, synthetic organic polymers, expansion producing additives, pigments, strength enhancers, waterproofing additives, alkali-aggregate reaction inhibitors, chromate reducers, and/or anti-microbial agents,
each based on the total weight of the component A,
b) providing a component B that comprises:
vi) 30-90 w % of at least one accelerator selected from the group consisting of alkanolamines, halides, formats, acetates, oxalates, nitrites, nitrates, thiocyanates, sulphates, thiosulphates, glycerol, (α-hydroxycarboxylic acids, and calcium aluminates,
vii) 0.1-5 w % of an anti-freeze agent which is selected from the group of sodium chloride, urea, and glycols,
viii) 10-70 w % of water, and
ix) optionally other additives selected from the group of plasticizers, superplasticizers, rheology modifiers, retarders, air-entrainers, de-aerating agents, corrosion inhibitors, fibers, synthetic organic polymers, expansion producing additives, pigments, strength enhancers, waterproofing additives, alkali-aggregate reaction inhibitors, chromate reducers, and/or anti-microbial agents,
each based on the total weight of the component B,
c) mixing component A and component B in a weight ratio of from 50:1 to 1:100 to provide a mixed composition,
d) pretreating the surface of the cementitious substrate to be repaired, and
e) applying the mixed composition to the cementitious substrate.

13 more elements

Dependencies are inferred from the claim text.