Studium vlastností vápenných omítek a malt s příměsí lehčeného metakaolínu

Abstract

Cement and lime represent the main binder used in the present building. World production of cement exceeds 1.5 billion tonnes, the production of lime and hydrated lime moves around 150 million tonnes. Production of these binders is highly energetically intensive and it is estimated to contribute 5-7% of global production of carbon dioxide. Therefore the research in building materials begins to focus on (matters) materials, which would be able to replace the cement in mortats partially; their production would be more environmentally friendly and it would also contribute to improvement of the concrete and mortar use properties. One material that meets these requirements is metakaoline, the product of thermal activation of kaolin and kaolinite-rich clays. In the domestic construction industry the metakaolin is used mainly as an active ingredient to lime mortar which is used for the historic buildings repairs. This thesis deals with the preparation and evaluation of properties of lime mortars containing lightgweight metakaoline, which is characterized by low density and increased porosity. Lightweight metakaoline is a completely new type of metakaoline, which has not yet been industrially manufactured and commercially offered on the market. Apart from the positive influence on the mechanical and durability properties, in the form of aggregates it should contribute to a substantial improvement of thermal properties of mortars and plasters. This thesis is one of the first contributions in the (issue) field of lightweight metakaoline problem.