Rajib Kumar Biswas

Steel fibers and their aspect ratios are important parameters that have significant influence on the mechanical properties of ultrahigh-performance fiber-reinforced concrete (UHPFRC). Steel fiber dosage also significantly contributes to the initial manufacturing cost of UHPFRC. This study presents a comprehensive literature review of the effects of steel fiber percentages and aspect ratios on the setting time, workability, and mechanical properties of UHPFRC. It was evident that (1) an increase

Safety of the existing corrosion damaged reinforced concrete (RC) bridges during a seismic event is a matter of increasing concern. To reduce the enormous economic loss and casualties, it is important to examine the potential seismic risk of corroded RC bridge structures. This paper presents a simplified method to determine the seismic fragility of corroded RC bridge piers by developing a simplified FEM model and seismic fragility analysis. To make the proposed approach realistic, the numerical

The structural behavior of RC beams subjected to non-uniform steel bar corrosion is studied here by developing a simplified numerical approach. At first, a modeling methodology for the steel bar corrosion is presented. Then, 3D nonlinear finite element analysis is carried out to assess the residual structural performance of RC beams with non-uniform steel bar corrosion. Obtained results from the numerical study were verified with the experimental work. Six reinforced concrete beams with identica

Ultra-high-performance concrete (UHPC) is considered to be a promising material for the strengthening of damaged reinforced concrete (RC) members due to its high mechanical strength and low permeability. However, its high material cost, limited code provisions, and scattered material properties limit its wide application. There is a great need to review existing articles and create a database to assist different technical committees for future code provisions on UHPC. This study presents a compr

In this study, a strengthening method was developed for reinforced concrete (RC) bridge piers with non-uniform corrosion (NUC). Three half-scale RC bridge piers with the same dimensions and rebar arrangements were experimented under reversed cyclic loading, where an axial stress equal to 1 MPa was applied to the specimens. Two specimens were subjected to NUC, where the average corrosion ratio was 10% and the other specimen was used as a control specimen. One corroded specimen was retrofitted wit

Despite being necessary, traditional construction frameworks have numerous disadvantages, i.e., waste of materials, labor-intensive, additional expenses, etc. On the other hand, the emergence of 3D printing offers a revolutionary way to improve construction methods by creating permanent concrete formwork that is 3D printed (3DP). The goal of the current study is to demonstrate the feasibility of 3DP concrete formwork as an effective substitute for traditional formwork systems by examining its st

Abstract Corrosion of reinforcement bars in reinforced concrete (RC) structures is considered a major concern. This study examines the flexural response of severely corroded RC beams retrofitted with ultra-high performance fiber reinforced concrete (UHPC) layer. UHPC layers were attached to the concrete substrate in four different configurations to investigate whether they could strengthen severely corroded RC beams. To represent carbonation-induced uniform corrosion, artificial corrosion was ad