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1. (WO2013119826) CEMENT HYDRATE COMPOSITIONS AND METHODS OF SYNTHESIS

Pub. No.:    WO/2013/119826    International Application No.:    PCT/US2013/025166
Publication Date: Fri Aug 16 01:59:59 CEST 2013 International Filing Date: Fri Feb 08 00:59:59 CET 2013
IPC: C04B 7/345
C04B 7/36
C04B 28/18
C04B 28/04
Applicants: MASSACHUSETTS INSTITUTE OF TECHNOLOGY
Inventors: SHAHSAVARI, Rouzbeh
PELLENQ, Roland J.m.
STEWART, Karen Lynn
VAN VLIET, Krystyn
YIP, Sidney
ULM, Franz-Josef
Title: CEMENT HYDRATE COMPOSITIONS AND METHODS OF SYNTHESIS
Abstract:
Cementitious compositions and methods of synthesis are disclosed. By decreasing the Ca-rich raw material in a cement composition, the content of Alite (Ca3SiO5) per ton of produced cement can be mitigated. Alite is the most energy-intensive and most polluting component among cement ingredients. By decreasing this component, the process can potentially reduce the environmental footprint and energy consumption by as much as 12% per ton of cement. In one embodiment, the average Ca/Si ratio in hardened cement paste can be reduced from ~1.7 to ~1.5. This corresponds to about a 12% reduction in Alite content per ton of produced cement. The cement compositions can also be characterized as solid-state cement hydrates including a plurality of silicate chains, the plurality of silicate chains including a plurality of dimers constituting at least about 60% of the plurality of silicate chains present in the solid-state cement hydrate, the plurality of dimers enhancing the strength of the solid-state cement hydrate. Such solid-state cement hydrates can also exhibit a periodic molecular structure formed from the plurality of silicate chains, e.g., ring-like structures.