Effect of Admixtures on the Fresh and Hardened Properties of Modern Rendering Systems Based on Mineral Binders

摘要

This paper presents the results from a doctoral project studying the chemistry and mechanism of modern rendering systems. The study is focused on polymer modified renders, a type of material that possesses several superior properties to conventional renders, such as better workability, crack resistance, adhesion to substrate and flexural strength.In this project the influences of different admixtures and additions with the special focus on organic polymers and air entraining agents were investigated. The study includes the mechanism of the hardening process, from plastic to hardened state, moisture transfer and obtained structure. In the plastic state the rheology, plastic shrinkage and water retention were studied. The chemistry and mechanism created by a certain component or combination/variation of component including water/binder ratio was examined and analysed.The results of the project will give a better understanding of rendering systems and their constitutive components.