Additive for cementitious materials
AssigneeUpm-Kymmene Corporation
InventorsHannele Kuosa, Anna Suurnakki, Antti Laukkanen, Jan-Erik Teirfolk, Markku Leivo
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Abstract
The invention relates to use of nano-fibrillar cellulose as an gas-entrainment stabilizer, which when used in cementitious materials, provides improved gas pore structure quality and/or stability and/or robustness with regard to water content variation. The invention further relates to a method for stabilizing gasentrainment of cementitious materials and to a method for providing cementitious material with improved air pore structure quality and/or stability and/or robustness with regard to water content variation.
Claims32
A method for stabilizing gas-entrainment of cementitious materials, comprising the steps of:
- providing nanofibrillar cellulose (NFC);
- providing at least one gas-entraining agent;
- mixing said NFC and the at least one gas-entraining agent with a cementitious composition, comprising at least binder, and water to obtain a cementitious paste;
- and
- allowing the thus obtained cementitious paste to harden to obtain gas-entrained cementitious material;
- wherein the gas-entrained cementitious material has an air pore spacing factor less than 0.4 mm.
A method for stabilizing gas-entrainment of cementitious materials, comprising the steps of:
- providing nanofibrillar cellulose (NFC);
- providing at least one gas-entraining agent;
- mixing said NFC and the at least one gas-entraining agent with a cementitious composition, comprising at least binder, and water to obtain a cementitious paste;
- and
- allowing the thus obtained cementitious paste to harden to obtain gas-entrained cementitious material, the gas-entrained cementitious material having gas pores;
- wherein the gas pores have an air pore specific surface greater than 20 mm2/mm3.
A hardened gas-entrained cementitious material comprising nanofibrillar cellulose (NFC), having a void spacing factor less than 0.4 mm, wherein void spacing factor is a maximum distance from any point in a capillary system to a surface of a nearest air bubble.
A hardened gas-entrained cementitious material comprising nanofibrillar cellulose (NFC), having specific surface greater than 20 mm2/mm3.
Dependencies are inferred from the claim text.