About this Research Topic
With increasing construction waste generation, increasing focus on sustainability initiatives, and decreasing available land for material stockpiling, it is becoming more imperative that civil infrastructure materials utilize a greater proportion of recycled and waste products. Organic waste aggregates, such as reclaimed asphalt pavement (RAP), crumb rubber, reclaimed asphalt shingles (RAS), and recycled and waste plastics, are used in multiple infrastructure applications, but significant stockpiles yet remain. Concrete and other cementitious composites offer one option for use of these materials, particularly since concrete is the most-used construction material in the world.
In order to incorporate greater volumes of RAP, RAS, crumb rubber, and waste plastics in cementitious composites, the mechanical and durability performance must be improved, since these materials often have a detrimental effect. The goal of this Research Topic is to collate the state-of-the-art in methods and techniques that can be implemented to improve the performance of cementitious composites with RAP, RAS, Crumb Rubber, and other organic-based aggregates as well as to investigate the effect on material properties and/or structural design, to examine the mechanism(s) affecting the performance, and to explore the recent advancements in material processing or additives to improve the performance. In addition, it is relevant to explore how these materials affect portland cement concrete as well as alternative binder systems (e.g., geopolymers, alkali-activated materials, calcium aluminate cements, calcium sulfoaluminate cements, polymer-modified cements) and alternative composite designs (e.g., roller-compacted concrete, self-consolidating concrete, pervious concrete, controlled low strength materials).
This Research Topic will address the following themes:
· Portland cement concrete with RAP, RAS, and crumb rubber aggregates
· Geopolymer concrete with RAP, RAS, and crumb rubber aggregates
· Alternative cementitious binders with RAP, RAS, and crumb rubber aggregates
· Cementitious-stabilized geotechnics with RAP, RAS, and crumb rubber aggregates
· Mechanisms and physicochemical interactions within this context
· Any other cementitious composites with related organic-based aggregates, such as recycled and waste plastics
· Structural and materials design accommodations to optimize organic-based aggregates usage in cementitious composites
· Utilizing organic-based aggregates in alternative concrete designs, such as roller-compacted concrete, self-consolidating concrete, pervious concrete, and controlled low strength materials
Keywords: Concrete, RAP, RAS, Crumb Rubber, Cement
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