Abstract
Plain concrete’s major two drawbacks are its low tensile strength and high carbon footprint. Joint adding of fibers and recycled/waste materials in concrete might assist to resolve these problems. In the present study, a novel technique is planned to improve the recycled aggregate concrete (RAC) mechanical behavior and durability performance by joint incorporation of silica fume (SF) and nylon fibers (NF). In this research paper, different properties of concrete samples are examined for example flexural strength, compressive strength, split tensile strength, penetration of chloride ions, acid resistance, and water absorption. It was noted that adding nylon fibers as individual components enhances the recycled aggregate concrete mechanical characteristics and resistance to acid exposure. The inclusion of nylon fibers improved the behavior of the recycled aggregate concrete; however, it also increased the chloride penetration and water absorption by only 18% and 8% respectively. Up to 26% of mechanical strength of concrete was improved when silica fume was added in comparison to reference concrete, silica fume also assisted in controlling the loss of durability because of adding recycled aggregate concrete and nylon fibers. Silica fume improved the bond between binder matrix and nylon fibers. The study revealed that the combination of 50% RCA, 0.5% nylon fibers and 20% silica fume are optimum for the joint incorporation into concrete that can assist in developing sustainable, durable, and ductile recycled aggregate fiber reinforced concrete.
Highlights
Numerous countries throughout the world are confronting a large deficiency of landfills to discard huge amounts of various construction and demolition wastes due to huge development of infrastructure
As concrete is the most versatile construction material, it is for the most part used to take the load in compression
Concrete mix standard deviation and coefficient of variation and compressive strength and was evaluated at 7, 28, and 90 days of curing as appeared in Figure 1 and Table 6 respectively
Summary
Numerous countries throughout the world are confronting a large deficiency of landfills to discard huge amounts of various construction and demolition wastes due to huge development of infrastructure. In nations, where development is emerging quickly increased infrastructure construction and demolition wastes, which leads to increased generation of CDW [1]. A significant part of CDW is causing landfills because of the lack of appropriate reusing methods, which makes social complexities and environmental issues. In 2018 it was calculated that 40 developing nations around the planet, created more than 3000 million tons of CDW [2,3]. CDW could be changed into recycled aggregate. Land pollution can be significantly reduced by substituting normal weight aggregates with recycled concrete aggregates
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