Sustainable materials that have matrices composed of natural fibers are known as green composites. They are currently a focus of research due to being sustainable both in terms of the reactants used to make them and the minimal or harmless waste and biproducts created during their synthesis. These composites are light in weight and strong enough to be used in structural applications. The extraction, processing, and characterization of natural fibers, as well as their properties, need to be well documented. This will help industry experts establish large-scale production systems to ensure that natural fibers are readily available as construction materials. This development, if achieved, will provide researchers with greater opportunities to study the performance of composite materials in structures and enable a broader understanding of the relationship between composite behavior and structural performance.

In addition, agricultural waste products can also be used in the manufacturing of green composites. In order to be used as a construction material, undesired particles and impurities need to be removed from agricultural wastes during processing. These processed agricultural waste products can then be used as an admixture or discrete material, depending upon the type of agricultural waste, in green composites.

Green composites, including those synthesized from agricultural waste products, can be used in various ways for both structural and nonstructural applications in civil engineering, for example, in roofs, retaining walls, rigid pavements, canal lining, partition walls, cladding walls, and embankments. Due to the organic nature of fibers processed from agricultural waste, new techniques are needed to delay or avoid the decomposition of agricultural wastes in green composites. Therefore, the link between the material properties of green composites and the resulting durability of their structural performance is an area which needs to be explored in detail.

The aim of this special issue is to publish up-to-date research contributions related to the manufacturing of new green composites for use in civil engineering applications. State-of-the-art reviews and original research articles that consider the structural behavior, while keeping in mind the material properties, of green composites are particularly encouraged.

Potential topics include but are not limited to the following:

• Manufacturing of green composites for use in civil engineering applications
• Material properties of green composites, including FRC (fiber reinforced concrete) and FRCM (fiber reinforced cementitious matrix)
• The extraction, processing, and characterization, as well as the properties, of natural fibers used in civil engineering applications
• The processing of agricultural wastes for use as construction materials
• Multiple fiber reinforced composites for structural elements in civil engineering applications
• Durability of green composites in civil engineering applications
• Performance of green composites in structures, including damage identification, dynamic behavior and fatigue behavior, and structural health monitoring (SHM) of strengthened structures by green composites
• Economic and environmental impacts of green composites used in civil engineering applications
• Nonstructural applications of green composites, especially those made from agricultural waste products, in civil engineering
• Commercialization of green composites in civil engineering, especially strategies for large-scale commercial synthesis of green composites from agricultural waste products