New polymorphous CaCO₃-based cementitious materials
Part 2: Calera – a technology assessment

1 Flue gas from coal and gas power plants as CO₂-source

2 Assumed process flow of the production of vaterite (CaCO₃)

Quelle/Source: Beamish Museum

3 Pipe lines and settling tanks of the closed Steetley magnesite factory at Hartlepool (annual capacity: 10 000 t magnesia), where magnesia was extracted from sea water

Quelle/Source: Beamish Museum

4 Global map of selected ocean board coal power plants (< 10 km distance)

5 World consumption of HCl (estimated 20 million t) for the year 2008 [18]

Antetype for Calera technology: construction of corals and sea shell

“Green cements” with the potential to significantly reduce CO₂ emissions are still in the focus of attention in the cement industry.

1 Introduction

Due to the high CO₂ emissons of conventional cement production currently a range of concepts for alternative “green cement” is investigated by engineers and researchers from within and outside the cement community. All of these approaches aim to partly reduce or even replace Ordinary Portland Cement (OPC). Due to the claimed potentials as well as the expectable effects it is the aim of the Institute for Technology Assessment and Systems Analysis (ITAS) work to assess these approaches in how far they really can lead to mass construction materials and compete against OPC. This...

TEXT Matthias Achternbosch, Ulrich Dewald, Christel Kupsch, Eberhard Nieke, Gerhard Sardemann, Karlsruhe Institute for Technology (KIT)

Issue 01/2013

New polymorphous CaCO3-based cementitious materials – Part 1: Calera – availability of resources

1 Introduction Great expectations are placed in the development of new cement-based binders with significantly less CO2 emissions compared to the production of Ordinary Portland Cement (OPC), the...

Issue 9/2016 WO 2016/115398 A1

Controlled process for precipitating calcium carbonate and vaterite precipitated calcium carbonate compositions formed by said process

(22) 14.01.2016 (43) 21.07.2016 (57) A process for converting gypsum into precipitated calcium carbonate including reacting a mixture comprising gypsum and a seed, a mineral acid, or both with at...

Issue 9/2018 KARLSRUHE INSTITUTE OF TECHNOLOGY (KIT) | GEFAK MBH

Why it is so hard to develop new binder systems for mass application?

1 Introduction There is broad agreement that the possibilities to significantly lower the CO2-emissions of cement production are limited. Traditional measures such as more efficient process...

Issue 6/2016 CENTRE FOR BUILDING MATERIALS, TU MÜNCHEN, MUNICH/GERMANY

Effect of alkali content of raw meal on composition and hydration of belite‑calcium sulfoaluminate cement

1 Introduction Currently about 2.8 billion tonnes of cement are produced every year worldwide. An increase in production of up to 4 billion tonnes can be assumed by 2050 [1, 2]. The highest increase...

Issue 08/2024

Effect of calcium carbide slag on the durability of alkali-activated ground granulated blast furnace slag-fly ash cementitious system

1 Introduction Portland cement is the most widely used building material, and Chinese cement output has reached 2.02 billion t in 2023. The production process of 1 t of cement generates about 810 kg...