1 Introduction
In recent decades, corrosion in harsh environmental conditions has mostly harmed RC constructions. It is causing a decrease in strength and efficiency. Several researches have been carried out to boost concrete strength and tackle corrosion issues. High-strength concrete is being marketed for usage in a wide range of building applications. HSC provides greater advantages than regular-strength concrete. Its HSC is more robust, and the designer decreases the element's cross-sectional area. On the industrial side, they are creating high-strength concrete using non-corroding GFRP bars as alternative reinforcement. Reinforcement concrete constructions finished HSC with GFRP bars, extending the structural parts’ service life. To accommodate the world highly evolved human civilizations, more and higher effective designs are required nowadays (Adam et al.,
2021; El-Sayed et al.,
2022; Erfan et al.,
2020; Nassif et al.,
2021; Yu et al.,
2021,
2022).
UHPFRC is a potential construction material with excellent self-consolidating properties, high durability resistance, and high mechanical strength, making it appealing for high-performance foundation designs. Currently, the majority of research is focused on exploring UHPFRC mix improvements (Xie et al.,
2018a; Yoo et al.,
2015), UHPFRC beams, columns and slabs flexural performance (Abadel et al.,
2022a,
2023; Baby et al.,
2013,
2014; El-Sayed,
2021; El-Sayed & Algash,
2021; Lachance et al.,
2016; Mahmud et al.,
2013), and UHPFRC elements reaction under blast pressures (Millard et al.,
2010). Because of developments in concrete technology, high-performance concrete is now accessible and employed HPC. Concerns have been raised concerning the efficiency of HPC columns, as the use of HPC to reduce cross-sectional dimensions favors the building of RC columns over conventional strength concrete (Hung & Hu,
2018).
Shin et al. (Shin et al.,
2015,
2017,
2018) and Hosinieh et al. (Hosinieh et al.,
2015) discovered that lowering the distance between the transverse reinforcements of the short column considerably boosted the force bearing capacities and force sustainability after peak in their research of the pure axial behaviors of short columns. Adding extra crossties for transverse reinforcements with predetermined stirrup spacing would just raise the overall toughness of the short columns without considerably boosting their force bearing capacities. Steel fibers were present at the time, which kept the concrete from spalling during failure and boosted the post-peak ductility of the columns (Fang et al.,
2019).
Palacios et al. (Palacios,
2015) also studied the cyclic efficiency of a column with a UHPC-fabricated plastic hinge region. The results of their research showed that using UHPC changed the typical mechanism of failure of RC columns with confinement increase and prevented concrete crushing. Several experimental and computational studies have been conducted in recent decades to examine the achievement of structures reinforced by FRP bars due to steel reinforcement corrosion, which is one of the major problems that shortens the lifetime serviceability and, thus, brittle failure of many concrete structures worldwide. FRP materials have recently become a viable material for manufacturing reinforcement bars for concrete buildings (American Concrete Institute (ACI)
2006).
Afifi et al. (Afifi et al.,
2014a) studied the efficacy of circular columns reinforced with CFRP bars and spirals. He discovered that the CFRP bars were successful in sustaining compression until the concrete was crushed and provided an average of 12% of column capacity. Mohamed (Mohamed et al.,
2014), also examined 14 full-scale circular RC columns under concentric axial stress with longitudinal Sand-coated GFRP bars and carbon-FRP (CFRP) restricted with circular hoops or FRP spirals. He stated that it offered enough restriction against buckling of the longitudinal FRP bars and satisfactory confinement of the concrete core in the post peak periods. Flexural and stress behavior of FRP-RC parts has recently been thoroughly studied (Canada,
2009).
However, it was still unknown how FRP-RC columns would behave under axial compression. However, FRP bars are not advised for use as longitudinal reinforcement in columns according to ACI 440.1R-06 (American Concrete Institute (ACI)
2006). Further study in this area is called for by ACI 440.1R-06 (American Concrete Institute (ACI)
2006), while Canadian standards (Canadian Standards Association,
2012) ignore the importance of FRP longitudinal reinforcement's compressive resistance in the compression zone in compressive and flexural concrete components. Previous studies have shown that FRP bars have lower strength and modulus in compression than in tension (Chaallal & Benmokrane,
1993; Wu,
1990).
CFRP bars have been found to have a compressive strength that is 78% of their tensile strength (Mallick,
1988; Wu,
1990). In addition, recent research on the bond behavior of conventional FRP rebars discovered that due to the distinctive characteristics of each FRP material and the variety of fiber/resin interfaces, it was difficult to anticipate bond behavior without doing experimental research.
In RC structures, BFRPs have gained popularity as an alternative to traditional FRPs (Refai et al.,
2015). Ibrahim et al. (Ibrahim et al.,
2015) used pull-out experiments to examine the bond-slip behavior among concrete and BFRP bars. He gave his OK for the reference to the well-known bond-slip presentation. BFRP is a potential substitute for other FRPs because of its lower cost, endurance to high temperatures, ease of production, and improved resistance to sulphate attack, chloride, effect stacking, and vibration (Lee et al.,
2014; Li & Xu,
2009; Liu et al.,
2015; Shi et al.,
2011; Wei et al.,
2010). BFRP bars may be incorporated into buildings in a number of different ways. A number of studies to assess the effectiveness of BFRP geopolymer concrete supporting components such columns, forbearing, and boards (Erfan et al.,
2019a).
However, to effectively offer UHPC to as large a market as possible, its use must be envisioned as a catalyst for realizing innovative structural concepts, as opposed to only being limited to incrementally improving current structural concepts and element thickness reduction. In addition, this complements specialist construction techniques, such as prefabrication and additive production, the use of which is otherwise unattainable (Abadel et al.,
2022b; Abdellatief et al.,
2023; Al-Obaidi et al.,
2022; Ozbakkaloglu et al.,
2018; Shang et al.,
2022; Wang et al.,
2022; Xie et al.,
2018b; Zhu et al.,
2022).
The main importance of this study is to examine the performance of using BFRP as longitudinal bars in the production of UHPSCC columns under axial stress, with varying stirrup diameters, spacing’s, and steel reinforcement rebars. To achieve this goal, an experimental plan was carried out on twelve UHPC column specimens with dimensions 150 mm × 150 mm and height 1,200 mm that were subjected to axial loading. In addition, ANSYS® finite element code was used to create finite element models for all specimens to simulate structural behavior of each specimen. Based on such investigations, additional stiffeners and UHPC were used to increase the load capacity of columns. When compared to RC columns, test findings show that basalt bars contributed about 90% of the outcomes.
1.1 Significance of Research
Eight steel-reinforced and four basalt-reinforced RC columns that had been exposed to axial stresses each were used in the current study. The findings of the experimental investigation are contrasted with those of the analytical study. The detailed investigation would be as described in the following:
1.
Analyzing the structural features of basalt-barred columns to ascertain their mechanism of failure
2.
Assessing the basalt bars' compressive impact on concrete columns.
3.
The non-linear Finite Element Model is examined by UHPC columns (FEM).
4.
Analytical results are contrasted with experimental results. The outcomes of the analysis aid in predicting the axial stress on the column.
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