**1. Introduction**

Concrete is one of the ancient and most widely used construction material. In recent decades, numerous advances and developments being made in the field of concrete, which were implemented in practical applications. Nowadays, the term modern concrete refers to concrete with good workability, high fracture toughness, high mechanical strength and chemical durability. Structural elements from such materials extends the frontiers of the design and enables the implementation of outstand, durable, ecological and safe structures of the highest quality.

The aim of this Special Issue is to publish current research on concrete composites based on Portland cement or other blended cements and binders containing inclusions of waste materials, special aggregates, e.g., from recycling and/or fibers. The Special Issue focuses on presenting the results of research on the properties and performance of concrete composites, novel experimental techniques, analytical methods, modelling, design, production and practical applications of these materials, and studies regarding the behavior of structural components, in situ performance, renovation, durability and sustainability of structures made of these composites. The next section provides a brief summary of each papers published.
