Priyo Suprobo

Bio: Priyo Suprobo is an academic researcher from Sepuluh Nopember Institute of Technology. The author has contributed to research in topics: Flexural strength & Beam (structure). The author has an hindex of 9, co-authored 60 publications receiving 273 citations. Previous affiliations of Priyo Suprobo include Heriot-Watt University.

Characterization of Fly Ash on Geopolymer Paste

Abstract: The effect of loss of ignition, specific gravity, fineness, specific surface area and soluble fly ash to compressive strength of geopolymer paste were studied. Six fly ashes from two different sources and different time of collection were evaluated. Sodium hydroxide and sodium silicate were used as alkali activator. Concentration of sodium hydroxide and mass ratio of sodium hydroxide to sodium silicate were fixed 14M and one respectively. The result indicated that the improvement in compressive strength of geopolymer paste was more influenced by fineness, specific surface area and soluble content of fly ash. Soluble content of fly ash greatly affected the compressive strength of geopolymer paste compare to the compressive strength of cement paste with 20% fly ash replacement.

Experimental Behavior of Concrete Columns Confined by Welded Wire Fabric as Transverse Reinforcement under Axial Compression

Abstract: This study examines the behavior of normal-strength concrete short columns confined by welded wire fabric (WWF) as transverse reinforcement under monotonically increasing concentric compression. The authors investigate the effects of volumetric ratio, spacing and lateral steel configuration, and distribution of longitudinal steel around the core perimeter or longitudinal reinforcement ratio on the uniaxial behavior of reinforced concrete columns. Tests were conducted on 22 short concrete columns reinforced with longitudinal steel and WWF or conventional ties under axial compression. The performance of columns laterally reinforced with WWF was compared with that of columns laterally reinforced with conventional ties. The findings show that WWF can be effective in confining the core concrete. Ductility increases of 130% and strength increases of at least 17% were found when compared with the corresponding specimens with conventional ties. The ductility of confined concrete columns improved with an increase of longitudinal reinforcement and decrease of transverse reinforcement spacing. Welded grids reduced the congestion of reinforcement and improved concrete quality in the members.

Crack Mapping on Shear-critical Reinforced Concrete Beams using an Open Source Digital Image Correlation Software

Abstract: Three reinforced concrete beams, one with no shear reinforcement and two others with shear reinforcement ratios of 0.4% and 1.1%, were tested to investigate the influence of stirrup spacing on the mode of failure, overall strength and ductility. The results show that the beam reinforced with closely-spaced shear reinforcement failed in a ductile manner, whereas the other two beams with large stirrup spacing and no stirrup exhibited only a small measure of ductility and failed in a brittle manner. The importance of the provisions of maximum spacing is highlighted to ensure adequate anchorage for the stirrups and prevent a premature shear failure to occur. The application of a non-contact monitoring system employing the open source digital image correlation software Ncorr, an ordinary digital camera and a smartphone is demonstrated to provide a visualization of the cracking process throughout the load history.

Visualization of shear cracks in a reinforced concrete beam using the digital image correlation

Abstract: A low-cost digital image correlation system is used to visualize the formation and propagation of concrete cracking in a reinforced concrete beam. The system employed comprises an ordinary digital camera, a remote image recording controller (a smartphone) and a freely-available, open-source image correlation software package Ncorr. In this paper, the application of this system is demonstrated to obtain a comprehensive time-lapse of longitudinal strain fields developing before and after the onset of shear cracking, thus allowing one to fully appreciate the mechanisms of shear failure in the beam. It is shown that the longitudinal strain fields obtained from the DIC system are in a good agreement with hand-drawn crack maps and that obtained from nonlinear finite element analysis.

Design Of Concrete Structures

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Strengthening and Repair of Reinforced Concrete Columns by Jacketing: State-of-the-Art Review

Abstract: Sustainability necessitates the protection of infrastructure from any kind of deterioration over the life cycle of the asset. Deterioration in the capacity of reinforced concrete (RC) infrastructure (e.g., bridges, buildings, etc.) may result from localised damage sustained during extreme loading scenarios, such as earthquakes, hurricanes or tsunamis. In addition, factors such as the corrosion of rebars or ageing may also deteriorate or degrade the capacity of an RC column, thereby necessitating immediate strengthening to either extend or ensure its design life is not limited. The aim of this paper is to provide a state-of-the-art review of various strengthening and repair methods for RC columns proposed by different researchers in the last two decades. The scope of this review paper is limited to jacketing techniques for strengthening and/or repairing both normal- and high-strength RC columns. The paper also identifies potential research gaps and outlines the future direction of research into the strengthening and repair of RC columns.