Patent ID: 11939273
Assignee: CONSTRUCTION RESEARCH & TECHNOLOGY GMBH
Field: Materials, metallurgy (Chemistry)
Classification: CPC C  Y | IPC C

Claim 0:
1. A limestone calcined clay cement construction composition comprising
a) a cementitious binder comprising one or more calcium silicate mineral phases and one or more calcium aluminate mineral phases, and having a Blaine surface area of at least 3800 cm2/g, in an amount of 180 to 400 kg per m3 of the limestone calcined clay cement construction composition;
b) a supplementary cementitious material having a Dv90 of less than 200 μm, in a total amount of 50 to 100 parts by weight, relative to 100 parts by weight of the cementitious binder a), the supplementary cementitious material comprising (b-1) a calcined clay material and (b-2) a carbonate rock powder in a weight ratio of (b-1) to (b-2) in the range of 0.5 to 2;
c) optionally, an extraneous aluminate source;
d) a sulfate source; and
e) a polyol in an amount of 0.3 to 2.5 wt.-%, relative to the amount of the cementitious binder a);
wherein the composition contains available aluminate, calculated as Al(OH)4−, from the calcium aluminate mineral phases plus the optional extraneous aluminate source, per 100 g of the cementitious binder a), in a total amount of
at least 0.08 mol, if the amount of said cementitious binder a) is in the range of 180 to less than 220 kg per m3 of the limestone calcined clay cement composition,
at least 0.06 mol, if the amount of the cementitious binder a) is in the range of 220 to less than 280 kg per m3 of the limestone calcined clay cement composition, and
at least 0.05 mol, if the amount of the cementitious binder a) is 280 kg or more per m3 of the limestone calcined clay cement composition;
and the molar ratio of total available aluminate to sulfate is 0.4 to 2.0;
the limestone calcined clay cement construction composition further comprising
f) an ettringite formation controller comprising (i) at least one of glyoxylic acid, a glyoxylic acid salt or a glyoxylic acid derivative; and (ii) at least one of (ii-a) a borate source and (ii-b) 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., organic carbonates, and mixtures thereof; and
g) a co-retarder selected from (g-1) α-hydroxy monocarboxylic acids and salts thereof, (g-2) phosphonic acids and salts thereof, (g-3) polycarboxylic acids and salts thereof, and mixtures thereof.