Abstract In this paper, the effectiveness of strengthening by a wooden plate for reinforced concrete (RC) beams that incorporate waste sawdust (SD) as partial substitute fine aggregate (sand) has been investigated. To end, two types mixtures were made: normal (NC) and (SDC), which was made substituting 15% volume sand with SD. Five RC (100 mm in depth, 200 width, 1500 length) experimentally tested flexural behavior under four-point loading. Three schemes used study. The first scheme only...

In this study, shear-critical reinforced concrete (RC) beams were strengthened by combining the prestressing and near-surface mounted (NSM) rods approaches. The potential danger of failure in such RC is a substantial concern as it considered threat. This study addresses its careful mitigation through experimental identification numerical analysis to enhance safety sustainability buildings reducing probability risk for these beams. Nine ten that tested had strengthened, one not. Internal (IP)...

Although pile cap bases of structures are the most significant element in construction and one difficult parts strengthening applications, previous studies on this element, particularly strengthening, quite limited. The extensively utilized, highly efficient, simple to implement solution is ultra-high performance concrete (UHPC). In study, six-half scaled beams were prepared experimentally tested. Three them strengthened with UHPC (one shear connectors only, steel mesh fabric (SMF), punching...

In this research, behavior of RC columns reinforced with recycled polyethylene terephthalate (PET) and steel fibers (SF) was experimentally investigated. The experimental work includes testing 8 dimensions 150x150x1000 mm subjected to axial loading up failure. Three volume fractions (1%, 2% 3%) were carried out for both PET SF. axial/lateral displacement the column transverse/vertical strain versus load bars recorded. peak load, yield failure mode, ductility stiffness studied in detail....

Abstract Fracture parameters of fiber concrete (FC) are currently a hot research area. mechanics is the field solid that helps to study type and propagation cracks in materials. It uses methods calculating driving force on crack characterizes material's resistance fracture. Behavioral characteristics determined by mouth opening displacement load–deflection method. This identifies fracture 33 notched simply supported beams made recycled aggregate cement with steel fiber. The ratio has been...

Abstract The contribution of shear resisted by flanges T-beams is usually ignored in the design models even though it was proven many experimental studies that strength higher than equivalent rectangular cross-sections. Ignoring such a result very conservative and uneconomical design. Therefore, aim this research to investigate capability machine learning (ML) techniques predict capacity reinforced concrete (RCTBs) incorporating flange. Five techniques, which are Decision Tree (DT), Random...

The study conducted axial tensile strength tests on concrete samples that replaced conventional aggregates with recycled aggregates. In Series I, using FNG instead of FNA resulted in a reduction compressive by 12.8–49.8% and 14.5–44.6%. If the proportion exceeds 50%, decreases more than 24.5% 27.5%. II, replacing CNA CRG reduced strengths 18.4–32.8% 5.1–24.9%, respectively; exceeding 40% results 32.8% 24.9%. III, made RCA, CNA, 20% showed decrease 8.8–22% 10.7–26%; RCA80 maximum reductions....

Abstract In this study, 10 ferroconcrete concrete (FC) beams with lightweight cores reinforced welded steel mesh as a shear reinforcement were evaluated under three-point bending tests along two conventionally normal-weight (NWC) beams. Expanded polystyrene and aerated autoclaved brick wastes used to create core concrete. The main factors include the type of for core, beam type, form number holes, existing fabric, hollow, hole placement. This study was done on tested beams' ductility index,...

This study compares between the mechanical properties of concrete either reinforced with recycled plastic (RP) or end-hooked steel (EHS) fibers volume fractions 1, 2 and 3%. Also, effects fiber type fraction on flexural responses were investigated using experimental program composed seven (RC) beams. Generally, results showed that RP EHS remarkably enhanced both characteristics capacity RC Specifically, matrix 2% exhibited highest capacities among all tested specimens. On other hand,...

Abstract Basically, the interface shear strength between two concrete layers of varying ages must be sufficient to withstand applied actions on structure, specifically fire attack, which may cause complete collapse composite structure. Thus, interfacial behavior was investigated and analyzed in this paper under influence a set parameters, including temperature (25, 200, 400, 600 °C), time exposure (30, 60, 90, 120, 180 min), type, fibers type (polypropylene fiber (PPF), steel (SF), hybrid...

Because of the degradation building materials and increased design load, concrete parts continually require repair. Special cementitious matrix components, Strain Hardening Cementitious Composites (SHCC), have exceptional ductility, strength growth during cracking, recurrent controlled-opening crack formation. The purpose this study was to improve qualities SHCC by reinforcing it with steel metal mesh. This examined optimization effects shear strengthening on capacity both damaged undamaged...

In many construction applications, including bridge pedestals, concrete corbels, and anchors, the concrete’s local compressive strength attribute (bearing) is crucial. One of benefits from bearing its role in mitigation failure risk increase safety buildings. The compression characteristics fully hardened were primary focus earlier study, with less attention paid to early age (less than 28 days). order evaluate qualities concrete—here defined as first month—the current experimental program...

While the development of sustainable construction materials, such as green concrete made from glass waste or recycled aggregate, has been extensively researched, much existing work focused narrowly on these two components. This limited scope highlights need for further investigation to comprehensively address their drawbacks and expand available knowledge base. Moreover, current study uniquely emphasizes shear response concrete, a critical aspect that not previously explored. Push-off...

Abstract Three push-out specimens were experimentally tested to investigate the behavior of tubular steel columns (TSC) with and without bolted shear connectors embedded in normal concrete (NC). Each specimen consisted a column encased 250 × 200 mm cube The embedment/the prominent height TSC was 100 mm. Foam used underneath form free space. study considered variables such as presence demountable studs reinforcement. failure modes, load-slip response, peak load/slip, stiffness analyzed....

<title>Abstract</title> Electromechanical and other service ducts must be carried vertically through structural components. The majority of researches have examined the strengthening transverse opening region in concrete beams. Since no one has beams with vertical openings, current study focuses on this topic. shear behavior RC externally strengthened near surface mounted (NSM) steel bars featuring holes was main focus article. Ten measuring 120 mm width, 200 depth, 1100 length were...

The main aim of the current research is to investigate flexural behavior reinforced concrete (RC) slabs strengthened with strain hardening cementitious composites (SHCC) experimentally and numerically. Seven RC were prepared tested under four-points loading test. One un-strengthened slab considered as control specimen while six SHCC layers. layers had different reinforcement ratios thicknesses. results showed that proposed strengthening techniques significantly increased ultimate failure...