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Harald Justnes
Harald Justnes
SINTEF Building and Infrastructure, Norway
How to Go Smart with Concrete

Concrete is the most man-made ¡°material¡± after purified water and the most common construction material. The popularity is earned by its versatility and because it is affordable being made out of cement, sand, gravel and water. Being a bulk commodity, cement is very cheap costing around 100 € per ton in Europe. Hence, if one want to go smart with concrete you can either add something cheap in large quantity (>5% of cement mass) called additive or something expensive in small quantity (<5 % of cement mass) called admixture that will enhance one or several properties of the concrete. 

In this review examples of beneficial admixtures and additives are given for the concrete properties 1) rheology in fresh state, 2) strength evolution and 3) durability. Examples are also given for how smart combinations of cheap additives can give synergistic effects in terms of strength.

Prof., Dr. Harald Justnes is Chief Scientist at SINTEF Building and Infrastructure, Department of Architecture, Materials and Structures. He has been with the Foundation for Scientific and Industrial Research (SINTEF) since 1985. His field of interest covers the chemistry of cement, concrete, admixtures and additives (including polymers) from production, through reactivity, to durability. He was educated at the Institute of Inorganic Chemistry, Norwegian University of Science and Technology (NTNU), and has been Adjunct Professor in ¡°Cement and Concrete Chemistry¡± at Institute of Materials Technology, NTNU since 2000. Justnes was appointed visiting Professor at China Building Materials Academy (CBMA), Beijing, China, in 2008 and Honorary Professor at Xian University of Architecture and Technology, Xian, China, in 2007.
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