Sewage Sludge Ash in Reinforced Concrete

The production of cement is responsible for 5 % of the global CO2-emissions (Development, International Energy Agency and World Business Council for Sustainable, 2009). It is thereby desirable to reduce the amount of cement used by replacing it, or part of it, with another material. Today the concrete industry is experienced in using fly ash from coal combustion. This project investigates how addition of incinerated sewage sludge ash (ISSA) to concrete affects the corrosion environment for reinforcement bars. This project used ISSA from Lynetten treatment plant. Relevant properties of the ISSA are investigated such as pH, Water Solubility, Water content, Content of organic materials, Electrical conductivity, and particle size. Furthermore the content of heavy metals and soluble anions in the ISSA was investigated. Tests were carried out on mortar samples as the mortar has smaller aggregates (