Flexural Behavior of Hybrid Reinforced Concrete Beams Combining Ultra High Strength Concrete and Porecilenite Aggregate Lightweight Concrete

Abstract

The main objective of this research was studied the flexure behavior of hybrid reinforced concrete beams combining reactive powder concrete (RPC) and lightweight concrete (LWC). The experimental work consists of casting and testing in flexure seven simply supported reinforced concrete beams. The dimensions of (7) beams were geometrically similar, having rectangular cross-section, of dimensions (125×200×1600) mm. Lightweight concrete was used in tension layer and reactive powder concrete was used in compression layer for all hybrid concrete beams. The main variables were; type of concrete (LWC and RPC), thicknesses of RPC layer (h R =0, 50, 100 and 200) mm and longitudinal reinforcement ratios (ρ= 0.0033 and 0.0227). The type of LWC used in the experimental work was porecilenite aggregate. The results showed that the characteristic strength (first and ultimate loads) was increased when the thickness of RPC layer was increased. In addition to that, these parameters were decreased the values of deflection. All beams failed by flexure mode without any shear cracks which achieved by yielding of tensile steel in the tension zone. Also, for all hybrid beams, the slip was absent between the concrete layers. Finally, the reinforcement ratio (ρ) had more effective factor of all parameter used to increase the stiffness value of the beams which increased the characteristic strength and reduced the deflection values.

Behavior of Reinforced Composite Foamed-Normal Concrete Beams

“…Figure 5 illustrates the usual load-defection profles for the studied beam specimens. Tat load-defection response of the experimentally tested reinforcement concrete beams can be divided into phases as follows: linear elastic up to frst cracking, postcracking stage with multiple crack growth, yielding of tension reinforcement stage, and deformation due to plasticity phase with gradual loss of load carrying capacity until failure [20].…”

Behavior of Hybrid Reinforced Concrete Beams on Flexural Strength

“…Given the challenge of finding a single material that possesses all desired properties to a satisfactory level, engineers are tasked with optimizing the use of different materials and construction methods (Yam,1981). Hybrid layered systems, incorporating various strength materials, have found application in civil engineering construction (Abtan and Jaber, 2016).…”

“…The results demonstrated that there was an increase in cracking and ultimate load and redaction in deflection by increasing the thickness of the reactive powder concrete layer. The type of failure was flexural mode for all models examined (Abtan and Jaber, 2016). Hisham et al studied the flexural behavior of hybrid tee beams The experimental results showed that using reactive powder concrete (RPC) in the web and normal strength concrete in the flange effectively enhanced performance of hybrid Tsection beams when compared with normal strength concrete T-beam, however, the increases in the first crack load, ultimate flexural load and ultimate deflection were 86.67%, 60% and 29.19% respectively, while, the increases for the case of using RPC in the flange and normal strength concrete in the web were 20%, 34.28% and 14.97 respectively when compared with normal strength concrete T-beam (Al-Hassani et al, 2015).…”

Rehabilitation of Hybrid RC-I Beams with Openings Using CFRP Sheets

“…In hybrid systems, high-strength concrete can withstand compressive force at the top zone of the beam, while LWC offers the advantage of being lightweight at the rest of the section. Many researchers studied the behavior of conventional hybrid beams consisting of two types of concrete and achieved promising results [1][2][3][4].…”