Use of at least one cellulose ether to reduce plastic shrinkage and/or cracking in concrete
AssigneeLafarge
InventorsConstantinos Xenopoulos, Isabelle Sgro
Life of this patent
Estimating the term…
Abstract
A method includes adding in a concrete composition at least one cellulose ether having either, a degree of substitution of methoxy radicals (DSM); or a degree of substitution (DS) comprised from 1.17 to 2.33 to reduce plastic shrinkage and/or reduce plastic cracking in concrete.
Claims21
A method comprising adding in a concrete composition at least one methyl cellulose ether having either,
- a degree of substitution of methoxy radicals (DSM);
- or
- a degree of substitution (DS)
- comprised from 1.17 to 2.33 to reduce plastic shrinkage and/or reduce plastic cracking in concrete,
- wherein the at least one methyl cellulose ether has a Brookfield viscosity value from 50 to 20 000 mPa.s measured for an aqueous solution at 2%.
A concrete comprising from 0.01 to 0.8% of at least one methyl cellulose ether (% by dry mass of cellulose ether relative to a dry mass of cement) as an additive to reduce plastic shrinkage and/or reduce plastic cracking, said cellulose ether having either,
- a degree of substitution of methoxy radicals (DSM);
- or
- a degree of substitution (DS)
- comprised from 1.17 to 2.33,
- wherein the at least one methyl cellulose ether has a Brookfield viscosity value from 50 to 20 000 mPa.s measured for an aqueous solution at 2%.
A hydraulic binder comprising 0.01 to 0.8% of at least one methyl cellulose ether (% by dry mass of cellulose ether relative to a dry mass of cement) as an additive to reduce plastic shrinkage and/or reduce plastic cracking, said cellulose ether having either,
- a degree of substitution of methoxy radicals (DSM);
- or
- a degree of substitution (DS)
- comprised from 1.17 to 2.33,
- wherein the at least one methyl cellulose ether has a Brookfield viscosity value from 50 to 20 000 mPa.s measured for an aqueous solution at 2%.
A method comprising adding in a concrete composition at least one hydroxypropyl methyl cellulose ether having either,
- a degree of substitution of methoxy radicals (DSM);
- or
- a degree of substitution (DS)
- comprised from 1.17 to 2.33, and having a non-zero molar substitution (MS) value lower than about 0.8 to reduce plastic shrinkage and/or reduce plastic cracking in concrete,
- wherein the at least one hydroxypropyl methyl cellulose ether has a Brookfield viscosity value from 50 to 20 000 mPa.s measured for an aqueous solution at 2%.
Dependencies are inferred from the claim text.