Investigating the Extrudability Potential of Concrete containing Fiber Reinforced Polymer and Recycled Aggregate: Mix Designs, Mechanical, and Durability Characteristics.

In recent years, fiber-reinforced concrete has become popular in the construction industry, in addition to the extrusion process that allows the construction of 3D printed homes. The extrusion of cementitious materials is a manufacturing process particularly suited to the innovative use of fiber-reinforced concrete. The efficient use of the properties of hardened concrete, as well as the reduction in weight with a simultaneous increase in performance, play a decisive role in this. Extrusion of fibers reinforced concrete has great potential from an economic, technological, and ecological point of view. The main objective of this dissertation is to investigate the mechanical properties of I-profiles done by extrusion process reinforced with three different types of fibers: short fibers glass, glass fibers textile, carbon fibers textiles. In terms of load bearing capacity, the three types of fiber-reinforced beams were subjected to flexural test. In addition, the durability of fiber-reinforced concrete was investigated by applying the leaching test and freeze and thaw test. The results of investigation have revealed that short fibers glass showed residual strength at the post cracking stage, moreover they increment the compressive strength of the concrete. In terms of durability, short fibers glass showed an important frost resistance. In addition, no hazardous impact on the environment was recorded in terms of leaching test. Glass fibers textile reinforced concrete showed higher load resistance than chopped fibers glass reinforced concrete. Last and not least, glass fibers textile reinforced concrete showed a high load bearing capacity and a significant improvement in terms of post cracking behavior compared to short glass fibers reinforced concrete. Finally, carbon fibers textile reinforced concrete showed a very high load bearing capacity and an important improvement in terms of post cracking behavior compared to glass fibers textile reinforced concrete.