Silica Green Stone as an SCM in concrete paving stones production : In order to reduce the total environmental footprint

Abstract

The cement industry is responsible for around 7% of the global CO2 emissions. Reducing this number has been on the forefront of the industry's mind for decades, but even with constant improvement and constant reduction in CO2 emissions per tonne cement used, the increasing globalization has kept the emissions high. Research in the industry has discovered supplementary cementitious materials (SCMs), that when partly replacing cement will produce most of the same results. SCMs are by-products from other industries and natural progression has led to the need for new ones. This thesis is, together with UiA, Aaltvedt Betong, SINTEF and Eramet, looking at how silicomanganese slag, called Silica Green Stone (SiGS), from Eramet can potentially be used as an SCM in concrete paving stones.This Master's Thesis will research primarily how changes in the solidification method and substitution level of SiGS, when used as an SCM in concrete paving stones, influences the quality of those stones. The thesis will look at how the two kinds of solidification, air-cooled and granulated, and the four substitution levels 20%, 30%, 40% and 50%, interacts with categories such as: Compressibility, density, strength development, durability, water absorption, frost resistance, geometric stability and visual qualities. to look at all of these categories a small literature study was combined with a different method for each category.