WO 2022/043349 A1

Limestone calcined clay cement (LC3) construction composition

(22) 25.08.2021

(43) 03.03.2022

(57) A limestone calcined clay cement construction composition comprises 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 freshly mixed 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 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 cementitious binder a). The composition contains available aluminatc, calculated as Al(OH)4-, from the calcium aluminate mineral phases plus the optional extraneous aluminate source, per 100 g of cementitious binder a), in a total amount of at least 0.08 mol, if the amount of cementitious binder a) is in the range of 180 to less than 220 kg per m3 of the freshly mixed composition, at least 0.06 mol, if the amount of cementitious binder a) is in the range of 220 to less than 280 kg per m3 of the freshly mixed composition, and at least 0.05 mol, if the amount of cementitious binder a) is 280 kg or more per m3 of the freshly mixed composition; and the molar ratio of total available aluminate to sulfate is 0.4 to 2.0. The construction composition further comprises f) an ettringite formation controller comprising (i) glyoxylic acid, a glyoxylic acid salt and/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, 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. The limestone calcined clay cement construction composition is a reduced carbon footprint composition and exhibits high early strength, high final strength, sufficient open time and high durability. Ingredients of the construction composition are abundantly available.

(71) Construction Research & Technology GmbH, Dr.-Albert-Frank-Str. 32, 83308 Trostberg (DE)

x

Related articles:

Issue 8/2023 US 2023/0312412 A1

Limestone Calcined Clay Cement (Lc3) Construction Composition

(22) 25.08.2021 (43) 05.10.2023 (57) A limestone calcined clay cement construction composition comprises a) a cementitious binder comprising one or more calcium silicate mineral phases and one or more...

more
Issue 7/2023 US 2023/0202926 A1

Method for the increase of workability of a binder composition comprising Portland cement, calcined clay, and limestone

(22) 08.06.2021 (43) 29.06.2023 (57) A method for increasing the workability of a binder composition including calcined clay, limestone, and Portland cement. The method includes a step of adding an...

more
Issue 11/2018 KAZAN STATE UNIVERSITY OF ARCHITECTURE AND ENGINEERING

Calcined mixture of clay and limestone as a complex additive for blended Portland cement

1 Introduction Portland cement (OPC) is the primary hydraulic binder used in construction. However, its production is characterized by high energy and resource consumption and involves significant...

more
Issue 7/2022 WO 2022/159034 A1

Cementitious material and uses thereof

(22) 19.01.2022 (43) 28.07.2022 (57) The present disclosure refers to a cementitious composition comprising Portland cement clinker in an amount of from about 70 wt% to 95 wt% by dry weight based on...

more
Issue 6/2021 NATIONAL COUNCIL FOR CEMENT AND BUILDING MATERIALS (NCCBM)

Investigations into calcined clay cements containing limestone as compared with calcined clay cements containing marble dust

1 Introduction Worldwide cement demand is increasing continuously due to the increasing population and infrastructural requirements. The annual global cement production is predicted to reach around...

more