Due to their crucial role in ensuring structural security under extreme environmental conditions, high-performance concrete structures have gained the global importance [[1]Present [2]Present [3]]. With increasing environmental concerns regarding construction waste, recycled fiber materials are increasingly implemented in reinforced concrete structures. Artificial recycled fibers, especially for their environmentally friendly characteristics, improve the structural durability and capacity of the load -bearing capacities, but also reduce the dependency on natural resources and energy consumption [[4]Present [5]Present [6]Present [7]]. Understanding the mechanical behavioral and degradation of fiber reinforced concrete (FRC) under extreme stress is of the greatest importance for the further development of sustainable construction practices, which requires systematic examinations for FRC performance under multifactorial environmental loads.
Concrete is widespread in construction projects, but ordinary concrete has weak train properties and great brittleness [8]. The presence of fiber increases the concrete strength (break and tensile strength) [9]. Service environment and stress methods significantly influence the deterioration in structural performance. The binding performance accelerates the deterioration under hard damage conditions, predictive models, the damage factors and interface restrictions [10]. At the same time, high -strength reinforcement in conjunction with fiber reinforcement concrete under cyclical stress shows a stronger binding connection [11]with stress patterns and sample dimensions that have a significant influence on the scene of the interface and the structure of ductility [12]. The fiber content and expansion rate also affect the kinetics of mechanical deterioration in property [13]requires an analysis of fiber reinforcement mechanisms and thermal damage coefficients to reliably [14]. Peak binding voltage in polypropylene fiber reinforced concrete (PFRC) structures (PFRC) show functional relationships with interface damage and enable the modeling of finite elements with fiber fracture element to effectively simulate the breakdown of the binding performance [15]. Current studies have carried out experimental studies on the material properties and binding properties of fiber reinforced concrete samples of different types and different mixtures [[16]Present [17]Present [18]]But there is no influence of several damage to the deterioration of hybrid fiber concrete structures, and the load anti -word of hybrid fiber concrete structures in complex environments is ignored [19].
Fiber improves the concrete performance due to different types and content of fibers. Therefore, fiber -reinforced concrete with specific functions have higher demands on the species and content of fibers [20]. The internal reinforcement mechanisms in hybrid fiber reinforced concrete systems (HFRC) show considerable complexity, whereby acoustic emission technology enables the quantification of interface binding reactions and the severity of the damage [21]. The strain types change the reinforcement mechanisms of hybrid fibers in concrete significantly, whereby the fatigue burden compared to static conditions induces a stronger loss of binding energy and damaging progression [22]. As a result, the coupled effects of stress patterns and sample dimensions on HFRC mining police officers remain poorly known. Rasterelectron microscopy (SEM) and X -ray (XRD) can have microstructure damage mechanisms and interface transition zone (ITZ) from HFRC under thermal exposure and the slip relationships with temperature gradients and energy breaches that occur, the superior predarian preditivity [23]. The service environment significantly influences HFRC performance reduction, since corrosion environments induce fiber breakdown and change the crack-UREST functions [24]. The structural durability under the flashing and salt frost conditions shows a quick deterioration, whereby the fiber hybridization conditions critically influence that influence the energy department, responsibility and the freez-speed resistance [25]. While hybrid fibers improve the concrete crack resistance, many studies integrate recycled aggregates with hybrid fibers and develop error criteria based on multi-rate load tests across different samples [26]. Although fiber type and loading methods change the mechanical performance, durability and default mechanisms, most of the existing research focuses on individual fiber systems [[27]Present [28]Present [29]Present [30]Present [31]Present [32]]. The systematic examination of the bond failure criteria for HFRC under coupled temperature damage and size effects remain.
The mechanism of the fiber hybrid effect and the size effect on the performance of the damaged FRC structure (Hybrid BF and PF) is not clear. In order to address these restrictions, this study conducts comprehensive experimental studies using 75 prismatic and 42 radiation types, which systematically evaluates the coupled effects of the sample geometry (size effect), fiber hybridization conditions (3: 1, 2: 1, 1) and the exposure of fibers (20 ° C). Research determines predictive models for the deterioration of bonds and constitutive behavior under fire conditions and offers theoretical basics for the assessment of the critical infrastructure according to fire. Research can provide a failure criterion and the experimental basis for the design of damaged concrete structures after the fire. Basalt polypropylene fiber concrete structures can be used in special concrete structures in extreme service environments. A prediction model for binding failure, taking into account size effect, fiber hybrid reinforcement effect and high -temperature damage, can provide a basis for the fire -resistant design of concrete structures with powerful performance and the security of the structure, if exposed to the fire, can be assessed precisely.