Patent ID: 11878942
Assignee: SIKA TECHNOLOGY AG
Field: Materials, metallurgy (Chemistry)
Classification: CPC C  Y | IPC C

Claim 14:
15. 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.