Chování malt na bázi románského cementu s přísadou lignosulfonátů

Abstract

This thesis deals with the properties of Roman cement. It is a natural hydraulic binder that stands out for its excellent strength and resistance to atmospheric influences. It is characterized by its initial solidification speed and short processing time. The theoretical part discusses the history of Roman cements, their production, hydration and use. At the same time, the process of cement production in general and the use of Portland cements are described. In the last part, retarding additives that extend the processing time are described. The experimental part is divided into several phases. In the first phase, pre-testing is carried out, where the use of retarding additives based on lignosulfonates and citric acid in combination with Roman cement Prompt Vicat is tested. Based on this phase, a suitable formula with an extended shelf life is selected. The following stages include testing fresh and hardened mortars.