Hydraulic additive as a new
“clinker substitute”

During the last four years, a hydraulic additive has been developed as a clinker substitute in the course of a research project at the Wopfinger Baustoffindustrie GmbH. The goals of the project were to provide the cement industry with an effective opportunity to  reduce its CO2-emissions, to achieve economic advantages and to be able to produce the new product in existing cement plants.

1 Introduction

There are three ways to reduce the total CO2 emission: Because of the energy-intensive decomposition of CaCO3, a reduction of the lime standard when burning clinker, to reduce the amount of fuel, and a lower power consumption for the subsequent grinding of cement. In addition to these significant ecologic and economic advantages, important primary raw material savings are realised thanks to the reduced limestone content. The burned clinker substitute contains a higher percentage of silicium- and aluminium-compounds compared with Portland cement clinker. These components often...

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