New calcium hydrosilicate-based cements: Celitement – a Technology Assessment
![1 Hydration of Celitement after 5 h, 8 h, 1 day und 7 days. The samples were broken under liquid nitrogen and examined by electron microscopy. After a few hours (above), all Celitement-grains are coated by C-S-H. After 7 days, the sample looks ceramic [31]](https://www.zkg.de/imgs/101551690_b23beca3d1.jpg)
![3 Average composition of main oxides within the earth’s crust [38]](https://www.zkg.de/imgs/101551682_41e53de1c5.jpg)
Green cements with the potential to significantly reduce CO2 emissions are still in the focus of attention in the cement industry. This paper outlines the approach of Technology Assessment and the research design, gives a brief overview of the binder characteristics of Celitement technology (calcium hydrosilicates) and discusses the resource availability. A model of a plausible manufacturing process of Celitement is given, followed by a discussion of the corresponding balances. Finally the paper summarizes the implications which can be derived from the perspective of Technology Assessment and innovation research.
1 Introduction
It is generally agreed that radical reductions of CO2 emissions cannot be realized maintaining the paradigm of traditional clinker production. Even more efficient combustion technologies, rising shares of traditional clinker substitutes and more efficient process technologies are not sufficient to meet reduction targets, even those of the Cement Sustainability Initiative [1, 2]. End-of-pipe technologies like CCS are still discussed as an essential part of the solution within the cement community [3]. This may raise false hopes for solutions in the distant future whose technical...
