| 发明名称 | Aqueous dispersions of silica for increasing early strength in cementitious preparations | ||
| 摘要 | Dispersion which is free of binders and which contains silica and at least one superplasticizer, the silica being a precipitated silica having a surface area greater than 50 m2/g, the aggregates and/or agglomerates in the dispersion having a median diameter of less than 1 μm and the proportion of silica being from 5 to 50% by weight, based on the total amount of the dispersion, and a process for the preparation thereof and the use thereof as a concrete admixture in cement-containing preparations. | ||
| 申请公布号 | US8835535(B2) | 申请公布日期 | 2014.09.16 |
| 申请号 | US200712446333 | 申请日期 | 2007.10.16 |
| 申请人 | Evonik Degussa GmbH;Construction Research & Technology GmbH | 发明人 | Fischer Ulrich;Wieland Philipp;Huebsch Christian;Grassl Harald;Becher Kerstin;Scheul Stefanie;Jetzlsperger Eva |
| 分类号 | C08J3/00;C04B14/06;C04B40/00 | 主分类号 | C08J3/00 |
| 代理机构 | Oblon, Spivak, McClelland, Maier & Neustadt, L.L.P. | 代理人 | Oblon, Spivak, McClelland, Maier & Neustadt, L.L.P. |
| 主权项 | 1. A dispersion, comprising, water, at least one precipitated silica, at least one silicate, or a combination thereof and at least one superplasticizer, wherein the superplasticizer is a water soluble polycarboxylate ether, a BET surface area of the at least one precipitated silica, at least one silicate, or a combination thereof is greater than 50 m2/g, the precipitated silica, silicate, or combination thereof is in the form of aggregates, agglomerates or combination thereof, a media diameter of the aggregates, agglomerates or combination thereof is less than 1 μm; the proportion of silica is from 5 to 50% by weight, based on the total amount of the dispersion, and the dispersion is free of inorganic dispersants and latex, and the superplasticizer/silica weight ratio is from 1/100 to 100/1. | ||
| 地址 | Essen DE | ||