Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
COMPOSITION BASED ON CALCIUM CARBONATE FOR USE AS A CEMENT
The present invention is directed to a composition for use as a cement comprising from 60 to 99 wt % of calcium carbonate and from 0 to 40 % by weight of cement, and at least one polysaccharide in an amount comprised between 0.1 and 10 wt %, wherein the polysaccharide has an average negative charge of at least 0.5 in terms of charge/saccharide unit, and wherein the wt % is based on the dry composition. The composition preferably comprises less than 30 wt % cement and from 1 to 10 wt % polysaccharide. A preferred polysaccharide is chondroitin sulfate, optionally with a small amount of at least another polysaccharide, e.g. sodium alginate. The invention is also directed to a method for the preparation of a cementitious composition as previously defined, comprising the following steps: a) preparing a mixture of carbonate and optionally cement; b) adding water, comprising from 0.1 to 10 wt% of at least one polysaccharide, in an amount comprised between 10 and 100% based on the amount of the mixture a); and c) mixing water with the mixture of carbonate and optionally cement.
COMPOSITION BASED ON CALCIUM CARBONATE FOR USE AS A CEMENT
The present invention is directed to a composition for use as a cement comprising from 60 to 99 wt % of calcium carbonate and from 0 to 40 % by weight of cement, and at least one polysaccharide in an amount comprised between 0.1 and 10 wt %, wherein the polysaccharide has an average negative charge of at least 0.5 in terms of charge/saccharide unit, and wherein the wt % is based on the dry composition. The composition preferably comprises less than 30 wt % cement and from 1 to 10 wt % polysaccharide. A preferred polysaccharide is chondroitin sulfate, optionally with a small amount of at least another polysaccharide, e.g. sodium alginate. The invention is also directed to a method for the preparation of a cementitious composition as previously defined, comprising the following steps: a) preparing a mixture of carbonate and optionally cement; b) adding water, comprising from 0.1 to 10 wt% of at least one polysaccharide, in an amount comprised between 10 and 100% based on the amount of the mixture a); and c) mixing water with the mixture of carbonate and optionally cement.
COMPOSITION BASED ON CALCIUM CARBONATE FOR USE AS A CEMENT
ZUSAMMENSETZUNG AUF BASIS VON CALCIUMCARBONAT ZUR VERWENDUNG ALS ZEMENT
COMPOSITION À BASE DE CARBONATE DE CALCIUM À UTILISER EN TANT QUE CIMENT
TORRI GIANGIACOMO (Autor:in) / NAGGI ANNAMARIA (Autor:in) / CASSAR LUIGI (Autor:in) / COLOMBO CASTELLI GABRIELE (Autor:in) / GOISIS MARCO (Autor:in) / FALINI GIUSEPPE (Autor:in)
31.07.2019
Patent
Elektronische Ressource
Englisch
IPC:
C04B
Kalk
,
LIME
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