Invention Grant
- Patent Title: Limestone calcined clay cement (LC3) construction composition
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Application No.: US18023055Application Date: 2021-08-25
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Publication No.: US11939273B2Publication Date: 2024-03-26
- Inventor: Massimo Bandiera , Peter Schwesig , Bernhard Sachsenhauser , Sebastien Dhers
- Applicant: Construction Research & Technology GmbH
- Applicant Address: DE Trostberg
- Assignee: CONSTRUCTION RESEARCH &TECHNOLOGY GMBH
- Current Assignee: CONSTRUCTION RESEARCH &TECHNOLOGY GMBH
- Current Assignee Address: DE Trostberg
- Agency: Curatolo Sidoti & Trillis Co., LPA
- Agent Floyd Trillis, III; Salvatore A. Sidoti
- Priority: EP 192857 2020.08.26
- International Application: PCT/EP2021/073436 2021.08.25
- International Announcement: WO2022/043349A 2022.03.03
- Date entered country: 2023-02-24
- Main IPC: C04B22/10
- IPC: C04B22/10 ; C04B7/02 ; C04B22/14 ; C04B24/02 ; C04B24/04 ; C04B28/14 ; C04B28/16 ; C04B103/40

Abstract:
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; b) a supplementary cementitious material having a Dv90 of less than 200 μm 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. The composition contains a controlled amount of available aluminate, calculated as Al(OH)4−, from the calcium aluminate mineral phases plus the optional extraneous aluminate source; 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. 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.
Public/Granted literature
- US20230312412A1 LIMESTONE CALCINED CLAY CEMENT (LC3) CONSTRUCTION COMPOSITION Public/Granted day:2023-10-05
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