Evaluating the Impact of Pozzoloniz Additives on the Mechanical Properties of Fiber-Reinforced Concrete

High-performance concrete (HPC) is defined as concrete that meets special combinations of performance and uniformity requirements that cannot always be achieved routinely using conventional constituents and normal mixing, placing, and curing practices. Ever since the term HPC was introduced into the industry, it has been widely used in large-scale concrete construction that demands high strength, high flowability, and high durability. High-strength concrete is always a type of HPC, but HPC is not always high-strength concrete. Specifying high-strength concrete does not ensure durability. Achieving a product that simultaneously fulfills all desired properties is challenging. Pozzolanic materials such as Ground Granulated Blast Furnace Slag (GGBS), silica fume, rice husk ash, fly ash, and high reactive metakaolin can be used in concrete as partial replacements for cement. These pozzolans are essential for producing HPC. In this study, X-ray diffraction (XRD) tests were conducted on these materials to analyze their constituents. Maintaining a minimal water-cement ratio is crucial, necessitating the use of superplasticizers, which play a significant role in HPC production. The study involved testing materials like rice husk ash, GGBS, and silica fume to achieve the desired properties. XRD tests were conducted on these pozzolanic materials to analyze their content. Synthetic fiber (Recron fiber) was added in varying percentages (0.0%, 0.1%, 0.2%, 0.3% by total weight of concrete), and concrete was cast. Additionally, different percentages of silica fume were used to replace cement while keeping the fiber content constant, and concrete was cast. Two types of cement were used: Portland slag cement and ordinary Portland cement. Mortar, cubes, cylinders, and prisms were prepared, followed by compressive, splitting tensile, and flexural tests. Porosity and permeability tests were also conducted. To achieve the performance characteristics not attainable with conventional concrete, numerous trial mixes were required to select the optimal material combinations.