Abstract
This study investigated the hybrid effects of two types of microfiber, namely, polypropylene and nylon, on the mechanical properties of high-strength mortar, which produced fine recycled aggregate (FRA). The amount of microfibers was maintained at a volumetric fraction of 0.6%. The microstructure and mechanical strength properties (compressive strength and flexural strength) of recycled mortar reinforced with hybrid-size microfibers were evaluated at various curing ages. Experimental results show that the inclusion of hybrid fibers significantly influenced the mechanical performance of the recycled mortar. The hybridization fiber at volume fraction 0.3% polypropylene + 0.3% nylon yielded the most promising mechanical performance. Enhancements of 8% on compressive and 11% flexural strength were achieved at 28 days. Scanning electron microscopy observations revealed that reinforcement at the microscale prohibited the initiation and growth of cracks at the micro level. High loads were required to form macrocracks within composites, thereby improving the mechanical strength of the mortar matrix.
Highlights
At present, recycled aggregates generated through the reuse and recycling of construction and demolition waste activities are one of the best alternative measures taken by the construction industry to solve natural aggregate deficiencies in some parts of the world and possibly reduce the degradation impact of environmental pollution
This study investigated the hybrid effects of two types of microfiber, namely, polypropylene and nylon, on the mechanical properties of high-strength mortar, which produced fine recycled aggregate (FRA)
Fine recycled aggregates (FRAs) demonstrate high absorption characteristic compared with coarse aggregates, making this material more difficult to incorporate into concrete due to a large water demand
Summary
At present, recycled aggregates generated through the reuse and recycling of construction and demolition waste activities are one of the best alternative measures taken by the construction industry to solve natural aggregate deficiencies in some parts of the world and possibly reduce the degradation impact of environmental pollution. A wide range of solutions have been proposed to overcome the brittle weakness of cement-based materials Among these solutions, the inclusion of a certain portion of small fibers randomly mixed into concrete mixture called fiber-reinforced concrete (FRC) is effective in reducing brittleness and enhancing tensile strength of concrete. Vineetha and Aravind [20] investigated the effects of a hybrid fiber between PP and NY fibers on the mechanical properties of recycled aggregate concrete They concluded that the specimen with fiber content of 1% combined with 25% PP and 75% NY fiber presents better performance in terms of the compressive strength, flexural strength, and split tensile strength of concrete compared with other specimens. Present studies have analyzed the utilization of hybrid fibers in reinforced recycled aggregate concrete composites, the benefits of hybrid fibers in enhancing the various properties of mortar using FRA remain unclear. Scanning electron microscopy (SEM) analysis was performed to visualize the microstructural behavior of the fibers and non-fiber mortar mixes in relation to their mechanical strength
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