公开(公告)号：US20230312413A1

公开(公告)日：2023-10-05

申请号：US18023276

申请日：2021-08-25

申请人： Construction Research & Technology GmbH

发明人： Klaus LORENZ ,  Wolfgang SEIDL ,  Tatiana MITKINA ,  Sabine HIMMELEIN ,  Peter SCHWESIG ,  Massimo BANDIERA ,  Bernhard SACHSENHAUSER ,  Farra RAMZI ,  Davide CARNELLI ,  Johanna PARKS ,  Kai Steffen WELDERT ,  Matthias KLEIN ,  Jasveer RAMROO BENI

IPC分类号： C04B7/02 ,  C04B28/18 ,  C04B28/04 ,  C04B28/06 ,  C04B28/14 ,  C04B24/02 ,  C04B24/04

CPC分类号： C04B7/02 ,  C04B28/188 ,  C04B28/04 ,  C04B28/06 ,  C04B28/14 ,  C04B24/02 ,  C04B24/04 ,  C04B2103/408

摘要： A construction composition comprises a) a cementitious binder comprising one or more calcium silicate mineral phases and one or more calcium aluminate mineral phases; b) optionally, an extraneous aluminate source; c) a sulfate source; d) an ettringite formation controller comprising (i) glyoxylic acid, a glyoxylic acid salt and/or a glyoxylic acid derivative; and (ii) at least one of a borate source and a carbonate source, wherein the carbonate source is selected from inorganic carbonates having an aqueous solubility of 0.1 g·L−1 or more, organic carbonates, and mixtures thereof; and e) a polyol in an amount of 0.2 to 2.5 wt.-%, relative to the amount of cementitious binder a). The composition contains 0.05 to 0.2 mol of total available aluminate, calculated as Al(OH)4−, from the calcium aluminate mineral phases plus the optional extraneous aluminate source, per 100 g of cementitious binder a); and the molar ratio of total available aluminate to sulfate is 0.4 to 2.0. The construction composition exhibits high early strength and sufficient open time. The advantageous effects are readily achievable for a variety of cements with varying elemental compositions.

公开(公告)号：US20240351956A1

公开(公告)日：2024-10-24

申请号：US18683820

申请日：2022-09-28

申请人： CONSTRUCTION RESEARCH & TECHNOLOGY GMBH

发明人： Bernhard SACHSENHAUSER ,  Massimo BANDIERA ,  Sabine HIMMELEIN ,  Kai Steffen WELDERT ,  Peter SCHWESIG ,  Matthias KLEIN ,  Ramzi FARRA ,  Klaus LORENZ

IPC分类号： C04B40/00 ,  C04B22/06 ,  C04B22/10 ,  C04B22/12 ,  C04B24/02 ,  C04B24/06 ,  C04B24/26 ,  C04B28/06 ,  C04B103/22 ,  C04B103/40

CPC分类号： C04B40/0039 ,  C04B22/062 ,  C04B22/106 ,  C04B22/124 ,  C04B24/02 ,  C04B24/06 ,  C04B24/2647 ,  C04B28/065 ,  C04B40/0032 ,  C04B2103/22 ,  C04B2103/408

摘要： A set control composition for cementitious systems comprises a) (a-1) a hydroxy monocarboxylic acid or a salt thereof, and (a-2) optionally, a polycarboxylic acid having a carboxylic acid equivalent weight of 333 or less, or a salt thereof, the carboxylic acid equivalent weight being the molecular weight of the polycarboxylic acid divided by the number of carboxylic acid functional groups, wherein (a-1) contributes at least 90% of the carboxyl groups to the total number of carboxyl groups of (a-1) and (a-2), b) at least one of (b-1) a borate source, and (b-2) a carbonate source, wherein the carbonate source is selected from inorganic carbonates having an aqueous solubility of 0.1 g·L−1 or more at 25° C., and organic carbonates, in a weight ratio of b) to a) in the range of 1.2 to 20, and c) a polyol in a weight ratio of c) to a) in the range of 1.0 to 10. The set control composition for cementitious systems effectively improves workability of cementitious systems for prolonged periods of time without compromising early compressive strength.