Green cement based on ground granulated blastfurnace slag

Important results from the project

The aim of this project includes 1) to develop green cement based on ground granulated blast furnace slag and alkali activation, and 2) to develop a novel non-metallic fiber-based reinforcement with improved adhesion to slag-based cement, with the goal to demonstrate the developed products for potential industrial applications, especially in acidic environments and / or under high temperatures, as well as for thin and lightweight structures. The results from the project show that the aim and the goal of this project have been fulfilled.

Expected long term effects

Through the project we have developed a green cement based on 80% slag and 20% Portland cement with waterglass as alkali activator. The concrete with this green cement is especially applicable for sewage pipes and infrastructures for wastewater purification. We have also developed a nano-impregnation technology to impregnate carbon fiber as reinforcement at high adhesion with cement-based materials. Together with the developed green cement, thin and bendable concrete slabs and lightweight concrete composites can be produced for versatile applications in building structures.

Approach and implementation

The project was carried out through an initial literature survey on scientific publications in the field of alkali-activated materials and followed with intensive experiments. Based on the literature and our previous experience as well as the new experimental results, we developed a green cement system with a low carbon footprint and a nano-impregnation technique for carbon fiber reinforcement. With the advices of industrial participants in the project, we have produced relatively large samples for demonstration of the developed products.