Recently, ultra-high performance concrete (UHPC) has been utilized in highway bridge connections, where its superior strength and durability help to reduce joint cracking enhance transverse load transfer. According the resistance factor design (LRFD) procedure specified by AASHTO, of connections is dependent on adhesion friction between connected materials. The objective present research identify value UHPC high-strength (HSC) with varying degrees roughness. To this end, UHPC-HSC specimens...

Recent research on ultrahigh-performance concrete (UHPC) for connection elements in highway bridges indicates an improvement the performance of overall bridge superstructure. However, there is limited information effect material and bond strength UHPC load transfer mechanism between adjacent box girders. A three-dimensional finite-element (FE) model was developed to study interface high-strength (HSC) connections. The UHPC-HSC modeled using traction-separation, damage initiation criteria,...

Flat slabs supported by columns without beams are widely used in construction owing to their economy and efficiency. However, brittle punching shear failure at slab–column connections can cause progressive collapse. UHPC has a higher tensile strength than NSC and, when appropriately reinforced with steel fibers, exhibits strain hardening after initial cracking. These properties make Ultra-High-Performance Concrete (UHPC) ideal for durable, thin, low-cost bridge decking heavily loaded...

For decades, synthetic fibers have been utilized to improve the performance of concrete structures by enhancing flexural strength, modulus elasticity, and other mechanical properties concrete. However, there are uncertainties about how affect coefficient thermal expansion (CTE), dynamic strength under freeze-thaw cycles. This study was an investigation effect temperature change on fiber-reinforced concrete, including CTE, strength. Two types fiber, polypropylene (PP) polyvinyl alcohol (PVA)...

Precast adjacent box girder bridges have become a preferred solution in several states due to their simple structure, economy, and ease of construction. However, longitudinal cracks often appear along the shear keys between girders. With its superior strength durability, ultrahigh-performance concrete (UHPC) has been used as an alternative grout material reduce key cracking enhance load transfer. The objective present research was evaluate performance UHPC using direct shear, tension,...

Adjacent box-girder bridges are a popular choice for short- to intermediate-span in several states because they easy, quick build, and cost-effective. Although longitudinal shear keys filled with grout between the girders transverse posttensioning (TPT) ties ensure monolithic behavior bridge, durability of still concerns researchers engineers. Ultrahigh-performance concrete (UHPC) has been adopted as new material connections bridge components. However, there is not yet any guidance or...

Abstract This research aims to experimentally investigate the flexural behavior of ultra-high-performance concrete (UHPC)–steel composite beams with joints under a negative bending moment in order ...

Ultra-high-performance fiber reinforced concrete (UHPFRC) exhibits strain hardening and multiple cracking behaviors when subjected to tension load. There are limited studies on the effect of steel aspect ratios tensile performance UHPFRC. Also, testing cementitious materials composites is challenging due lack a standardized direct method with wide variation. This study experimentally investigated hooked end straight behavior UHPFRC 2% volume fraction. A test setup was first developed obtain...

Ultrahigh-performance concrete (UHPC), with its enhanced strength and durability, has been proposed as the joint material in adjacent box-beam bridges to address issue of longitudinal cracking. Recently, Federal Highway Administration (FHWA) performed laboratory testing two box beams connected by a UHPC shear key containing transverse reinforcement bars (SRBs), results suggest that an improvement overall performance may be achieved using new design. However, there is no information about...

This work targets modular nanogrids for remote locations, where photovoltaic modules can be gradually introduced to grow the renewable energy capacity at minimal capital cost, while reducing diesel fuel consumption. Today's grid-tied micro-inverters provide a solution ac power generation in but battery storage remains centralized, requiring an additional ac-dc converter. The main contribution of this is new micro-inverter platform and control scheme with bidirectional flow between nanogrid,...

Adjacent box girders are widely used in short to intermediate span bridges several states because they make quick and easy build. However, the strength serviceability of this type bridge can frequently be compromised by reductions efficiency load transfer shear resistance due joint degradation at keys. Because its superior mechanical properties improved durability, ultra-high performance concrete (UHPC) has been proposed as an alternative grout material eliminate key degradation. In project,...

Recently, fiber has been incorporated into concrete mixtures, where its distribution in the matrix helps to improve and enhance mechanical properties of fiber-reinforced (FRC). The aim this study is investigate influence steel synthetic parameters, along with different coarse aggregate maximum sizes (CAMZs) on FRC performance. Additionally, past research, empirical relationships among compressive, tensile, flexural strengths plain were assessed, correlations between these examined. For each...

Although the precast segmental construction (PSC) technique can relieve age-dependent difficulties and accelerate bridge as compared to cast-in-situ (CSC) for long-span prestressed concrete box-girder bridges (LSPCBB), ordinary joints between adjacent segments are risky. In order improve bond strength at joint interface enhance structural reliability, ultra-high-performance (UHPC) be used fill a new cementitious material with high strength, ductility, durability. Thus, effect of naturally...