Sukhoon Pyo

Sukhoon Pyo
Ulsan National Institute of Science and Technology | UNIST · Department of Urban and Environmental Engineering

Professor

About

74
Publications
9,791
Reads
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1,439
Citations
Citations since 2016
56 Research Items
1227 Citations
2016201720182019202020212022050100150200250300
2016201720182019202020212022050100150200250300
2016201720182019202020212022050100150200250300
2016201720182019202020212022050100150200250300
Additional affiliations
January 2019 - present
Ulsan National Institute of Science and Technology
Position
  • Professor (Assistant)
July 2014 - December 2018
Korea Railroad Research Institute
Position
  • Senior Researcher
September 2009 - April 2014
University of Michigan
Position
  • Research Assistant
Education
September 2009 - December 2013
University of Michigan
Field of study
  • Mechanical Engineering
September 2009 - May 2014
University of Michigan
Field of study
  • Civil Engineering
March 2006 - February 2008

Publications

Publications (74)
Article
The results of an experimental investigation of UHP-FRC tensile response under a range of low strain rates are presented. The strain rate dependent tests are conducted on dogbone specimens using a hydraulic servo-controlled testing machine. The experimental variables are strain rate, which ranges from 0.0001 1/s to 0.1 1/s, fiber type, and fiber vo...
Article
Full-text available
This paper investigates the effect of the rheological properties of fresh binder on the compressive strength of pervious concrete. Pervious concrete can be used to reduce stormwater runoff, urban heat island effect, or noise. Because of a limited amount of binder, the compressive strength of pervious concrete is one of the most critical properties...
Article
Full-text available
This study proposes the surface-perforated mortar (SPM) to mitigate railway noise. As one of the most emerging noise problems, railway noise deteriorates the quality of human lives. This paper investigates the sound absorption performance of SPM and it is compared to that of porous concrete which has been adopted as a potential solution for railway...
Article
Both structural and material performance of railway sleepers are critical to ensure the safety of railway track structures. In this study, for the first time, ultra high performance concrete (UHPC) is adopted to the post-tensioning type of sleeper to prolong design life and reduce the maintenance of sleepers. A structural design is carried out to f...
Article
The objective of present study is to utilize and study the reactivity and hydration behaviour of thermo-mechanically activated waste concrete powder (WCP). For activation, the WCP was burned for 2 h at 650 °C, followed by mechanical grinding through ball milling. The reactivity of the activated WCP was improved significantly, as corroborated throug...
Article
Full-text available
To mitigate environmental challenges, such as urban flooding, noise pollution, and the urban heat island effect, pervious concrete has been developed. This research was intended to develop pervious concrete made from ground granulated blast furnace slag (GGBFS) to further decrease the environmental impact of the construction sector by reducing the...
Article
Full-text available
The present study proposes the development of ultra-high performance lightweight concrete (UHPLC). Hollow glass microspheres (HGMS) were used as a lightweight material, and their pozzolanic activity was verified through different tests under multiple curing conditions. High volume of HGMS was incorporated into ultra high performance concrete (UHPC)...
Article
Full-text available
The amendment of cementitious binders with waste materials aids as a path to reduce the volume of waste and carbon emission. This review summarizes the current state of practice for cementitious binder fabrication in favor to the utilization of waste materials such as waste concrete powder (WCP), coal bottom ash (CBA) and steel slags. These materia...
Article
Full-text available
The vibration-reducing ability of construction materials is generally described by the damping ratio of the materials. Previously, many studies on the damping ratio of concrete have been done, such as the addition of rubber, polymer, fiber, and recycled aggregates in the concrete. However, the application of these materials in construction is limit...
Article
Surface perforated mortar (SPM) is a cement-based acoustic material that can reduce railway noise. SPM has macro-sized holes on its surface, and the geometry of the holes influences the majority of the absorption performance of SPM. A previous study achieved a higher sound absorption performance than that of traditional pervious concrete by attenua...
Article
The porosity of construction materials has a direct impact on some of their properties such as sound absorption, heat transfer, and strength. Several traditional procedures have been developed to measure the porosity, however , their applications can be limited because of the low accuracy and measurement complexity among other drawbacks. This study...
Article
Full-text available
This paper investigates the effect of silica fume on the mechanical properties of metakaolin-based geopolymers with different silicon-to-aluminum molar (S/A) ratios. Geopolymer has been extensively studied as an alternative to traditional cementitious material because of its low CO 2 emissions. Previous studies revealed that the application of sili...
Article
Hybrid alkaline cement composites (HACC) were developed to overcome the low compressive strength of hybrid alkaline cement. Synthesized with geopolymer and cement paste, HACC contains a larger amount of calcium and alkali-activator than general hybrid alkaline cement does. Although HACC can achieve higher compressive strength than geopolymer and ce...
Article
Full-text available
This paper explores hybrid alkaline cement composites with high cement content over 50%. Calcium (Ca) accelerates the strength development and improves the compressive strength of geopolymer. However, the mixing proportion of Ca in geopolymer has been limited because Ca significantly decreases the flow of fresh geopolymer. This study resolves the f...
Article
Full-text available
Laser cutting of intrusive rocks, including granite, gabbro, and diorite, is carried out in order to assess the cut characteristics through geometrical measurements, such as kerf width, melting width, and penetration depth. The absorption rate for each specimen at the wavelength of 1064 nm is measured using a spectrophotometer. A multimode fiber la...
Article
Full-text available
This study was conducted to address practical problems in producing structural pervious concrete, such as issues with mix proportioning, paste sagging, porosity, strength, and acoustic absorption. Concrete mixtures with varying aggregate types, target void ratios, and fiber contents were cast in cylindrical and panel-type specimens to determine the...
Article
A railway bridge with slab track is subjected to end rotations because of the deflection of the girder during train operation. At the ends of a slab track, the end rotation of the bridge girder causes uplift deformation of the slab track, and leads to compressive stresses in the rail fasteners. In this study, a prototype bridge consisting of one sp...
Article
Full-text available
This numerical study investigates the structural performance of railway sleepers made of ultra high-performance concrete (UHPC). First, numerical concrete sleepers are developed, and the tensile stress-strain relationship obtained from the direct tension test on the UHPC coupons is used for the tensile constitutive model after applying a fiber orie...
Article
The expansion in cementitious materials can be generally caused by a generation of air bubbles by adding pore generation materials. Even though these materials are beneficial for forming porous structure, they can cause drastic changes in fresh and hardened properties due to their reactions with cementitious materials. To identify these relationshi...
Article
Full-text available
Although ultra high-performance concrete (UHPC) has great performance in strength and durability, it has a disadvantage in the environmental aspect; it contains a large amount of cement that is responsible for a high amount of CO2 emissions from UHPC. Supplementary cementitious materials (SCMs), industrial by-products or naturally occurring materia...
Article
A series of experiments was conducted to investigate the crack-expansion of a cement matrix containing atomized basic oxygen furnace slag with a metallic iron. The BOF slag particles were dispersed in supersaturated Ca(OH)2 solution mimicking the pore solution in a cement matrix and the changes in these particles were visually observed. X-ray diffr...
Article
This experimental research investigates the structural and electrical responses of ultra-high performance concrete (UHPC) railway sleepers with three different levels of steel fiber content. The UHPC sleepers used in this research were fabricated using a conventional concrete sleeper manufacturing process including the post-tensioning method. They...
Article
Full-text available
This experimental research investigates the mechanical properties of municipal plastic waste-based particulate composites reinforced with coal ash (CA), the by-product of thermal power plants, for sustainable railway sleepers. Six series of sustainable composites filled with inorganic mineral fillers, including CA, were prepared by a twin-screw ext...
Article
Full-text available
This experimental research investigated the applicability of the liquid crystal display (LCD) by-product of the refining process as a sustainable and alternative alkali activator for ground granulated blast-furnace slag (GGBFS) blended cement concrete. Three levels of binder replacement using the industrial by-product, and four water/binder ratios...
Article
Full-text available
The use of lightweight concrete has continuously increased because it has a primary benefit of reducing dead load in a concrete infrastructure. Various properties of lightweight concrete, such as compressive strength, elastic modulus, sound absorption performance, and thermal insulation, are highly related to its pore characteristics. Consequently,...
Article
Full-text available
This experimental study investigates the effects of the aggregate surface conditions on the compressive strength of quick-converting track concrete (QTC). The compressive strength of QTC and interfacial fracture toughness (IFT) were investigated by changing the amount of fine abrasion dust particles (FADPs) on the aggregate surface from 0.00 to 0.1...
Article
As transportation on roads and railways has become an essential means enabling the development of cities, residents living near roads and railways face undesirable noise pollution. To reduce this noise pollution, sound absorbable porous cement-based materials have great potential in terms of high sound absorption ability at a wide frequency range....
Article
Full-text available
This experimental research highlights the applicability of laser cutting to cement-based materials using multimode fiber lasers. A 9 kW multimode fiber laser is used, and the experimental variables are the water-to-cement ratio, laser speed, and material compositions such as cement paste, cement mortar and ultra high performance concrete (UHPC). Th...
Article
This study investigated the interfacial fracture toughness (IFT) between injected quick-hardening mortar and coarse aggregate to increase the strength of quick-converting track concrete. The effects of different maximum grain size of sand and different additives (two types of polymer, silica fume, ground granulated blast-furnace slag and fly ash) o...
Article
Full-text available
Cement-based materials are the most prevalent construction materials, and the conventional cutting techniques are still mostly used for fabricating the materials. However, these conventional cutting methods could generate undesirable micro-cracks and remove unintentional structural sections. This experimental study aims to evaluate the effects of t...
Article
The results of experimental investigation of ultra-high performance concrete (UHPC) by evaluating the flexural response are presented in order to qualitatively evaluate the effects of chloride-induced corrosion. The third-point bending test is carried out using the hydraulic servo-controlled testing machine. The experimental variables are thickness...
Article
The strength of quick-converting railway tracks is expected to be lower due to abraded fine particles attached to the surface of ballast aggregates caused by gravel friction under repetitive train loading. The effects of abraded fine particle content on the failure process of quick-hardening concrete were investigated using digital image correlatio...
Article
Concrete structures that employed general and multicomponent blended binders were constructed using a low-carbon, ecofriendly microwave heat curing technology with the aim of accelerating the concrete's curing process. In this study, a field-cast concrete tunnel lining that employed a general binder (portland cement) and a precast box culvert that...
Article
In order to effectively control ambient noise from transportation, this experimental study aims to develop sound absorbable high performance concrete. The main parameters evaluated include porosity, acoustic absorption coefficient, noise reduction coefficient, compressive strength, and freeze-thaw resistance. The PU test setup is adopted to charact...
Article
Full-text available
The results of an experimental investigation on the physical and chemical characteristics of cement-based materials under laser interactions are presented. The laser cutting tests were conducted using a multi-mode continuous fiber laser with a laser power of 1 kW. The experimental variables were laser speed, water to cement ratio, and material comp...
Article
This experimental study was conducted to evaluate the abrasion resistance of ultra high performance concrete (UHPC) that incorporated pre-selected coarser aggregates. The aggregates were selected based on their properties and local availability. In addition, coal bottom ash powder was also used with coarser aggregates as a replacement for silica po...
Article
High production cost and scarcity of raw materials may hinder the application and accessibility of ultra-high performance concrete (UHPC). In the present study, mine tailings, mineral waste products from mining sites, were applied to mitigate these problems. Two types of quartz-based mine tailings produced in South Korea were used to substitute sil...
Article
In this study, the hardening process of ultra high performance concrete (UHPC) was monitored non-destructively using a single embedded sensor system and the characteristics of guided waves, especially the Lamb wave. Lamb wave propagation depends on the material properties of the medium and boundary conditions. Since the boundary conditions of the e...
Article
This research reviewed and compared the railway noise standards of major railway countries because the control of railway noise has become more important recently. In order to satisfy demand for railway vehicles capable of higher speeds and to reduce maintenance, concrete slab track is becoming more popular due to its high rigidity compared to conv...
Article
Full-text available
This study successfully applied multi-mode laser cutting with the variation of the laser cutting speed to cement mortar for the first time. The effects of the amount of silica sand in the cement mortar on laser cutting are tested and analyzed. The kerf width and penetration depth of the specimens after laser cutting are investigated. As the laser c...
Article
Full-text available
Railway ballast, for which natural crushed stone aggregates have been generally used, is an essential track component for the distribution of train loads along the rails and sleepers to the roadbed. However, the use of natural crushed stone aggregate causes environmental destruction as well as dust production in train service. This paper evaluates...
Article
This experimental research investigates the mechanical properties and shrinkage of ultra high performance concrete (UHPC) incorporating coarser fine aggregates with maximum particle size of 5 mm. To adequately design UHPC mixtures using various sizes of solid constituents, particle packing theory was adopted. UHPC mixtures containing either dolomit...
Article
Experimental results on the effects of chloride content of ultra high performance concrete (UHPC) are presented. The experimental variables are the amount of sodium chloride, ranging from zero to 3.0% per cement weight, and matrix strength, including normal mortar and high strength mortar. Sodium chloride is directly mixed with cement matrix in ord...
Article
The shear resistance of ultra-high-performance fiber-reinforced concrete (UHPFRC) was investigated by using a newly proposed shear testing system. UHPFRCs displayed strain-hardening responses, in both shear and tensile testing, accompanied with multiple microcracks. The shear resistance of UHPFRCs was clearly influenced by their tensile resistance...
Article
The ballasted track system has been widely adopted on conventional railways due to its ease of construction, but its key shortcoming is its need for frequent maintenance. In recent years, with the growing demand for railway vehicles capable of higher speeds and capacities, the concrete track is becoming more popular due to its high rigidity and rel...
Article
This experimental research addresses the physical properties of eco-friendly Ultra High Performance Concrete (UHPC) incorporating industrial by-products including coal bottom ash, fly ash and two types of slag powder. Slump flow, compressive strength development, porosity, setting time, autogenous shrinkage and thermogravimetric analysis of UHPC ar...
Article
Full-text available
This research suggests feasible means for domestic railway industries to actively enter overseas railway markets by thoroughly analyzed the business trends of the expanding international railway markets and their characteristics. The 983 independent cases of international railway orders introduced in domestic markets during the past five years were...
Article
Ultra high performance concrete (UHPC) is an emerging construction material with its superior mechanical properties. However, UHPC requires high amount of energy intensive materials including cement, which could cause unfavorable environmental impact compared to normal concrete. Various eco-friendly UHPC mix designs are proposed by incorporating in...
Article
This experimental study investigates the direct tensile behavior of ultra-high performance fiber reinforced concrete (UHP-FRC) at strain rates ranging from 90 to 146/s. The tests are conducted using a recently developed impact testing system that uses suddenly released strain energy to generate an impact pulse. Three fiber types were considered, a...
Article
This paper investigates crack speed in ultra-high performance concrete (UHPC) using pre-notched three-point bending specimens. The experimental parameters are fiber volume fraction and rate of loading. A hydraulic servo-controlled testing machine is used to apply lower notch tip strain rates, in the range of 0.025–1.0 1/s, while a newly developed i...
Article
Assessment on adequate dosage of superplasticizer in eco-friendly ultra-high performance concrete (UHPC) containing industrial by-products was carried out from the standpoint of workability. Various types of industrial by-products, including blast-furnace slag, coal bottom ash and rapid-cooled electric arc furnace oxidizing slag, were utilized, and...
Article
A composite railroad track is a rigid track system that is developed using quick-hardening infilling materials, and has the advantages of a reduced maintenance cost compared to a normal conventional ballasted track. Quick-hardening infilling materials were developed in this study through a process that, which does not require the processes of clean...
Article
This study investigated the corrosion resistance of strain-hardening steel-fiber-reinforced cementitious composites (SH-SFRCs) in a chloride environment. Two types of steel fibers, hooked and twisted, were added (2% by volume) to a high-strength mortar matrix (90 MPa). All the specimens were exposed to cyclic wetting in a 3.5% chloride solution fol...
Data
The results of an experimental investigation of UHP-FRC tensile response under a range of low strain rates are presented. The strain rate dependent tests are conducted on dogbone specimens using a hydraulic servo-controlled testing machine. The experimental variables are strain rate, which ranges from 0.0001 1/s to 0.1 1/s, fiber type, and fiber vo...
Article
Experiments have consistently shown that the tensile strength of concrete increases with increasing strain rate. The reasons for this phenomenon are not yet well understood and several hypotheses have been proposed in the past to explain it. This study offers additional insight through the application of dynamic fracture mechanics. The relationship...
Article
A multiscale modeling scheme that addresses the influence of the nanoparticle size in nanocomposites consisting of nano-sized spherical particles embedded in a polymer matrix is presented. A micromechanics-based constitutive model for nanoparticle-reinforced polymer composites is derived by incorporating the Eshelby tensor considering the interface...
Article
Full-text available
Polymeric thin-film assemblies whose bulk electrical conductivity and mechanical performance have been enhanced by single-walled carbon nanotubes are proposed for measuring strain and corrosion activity in metallic structural systems. Similar to the dermatological system found in animals, the proposed self-sensing thin-film assembly supports spatia...
Article
An elastoplastic damage model considering progressive imperfect interface is proposed to predict the effective elastoplastic behavior and multi-level damage progression in fiber-reinforced metal matrix composites (FRMMCs) under transverse loading. The modified Eshelby’s tensor for a cylindrical inclusion with slightly weakened interface is adopted...
Article
A three-dimensional �3D� micromechanics-based evolutionary damage model is proposed to predict the effective elastic behavior of continuous fiber-reinforced brittle matrix composites with microcracks and imperfect interfaces. Eshelby’s tensor for a circular cylindrical inclusion with slightly weakened interface is adopted to model continuous fibers...
Article
Based on the micromechanics-based constitutive model, derived in our preceding work [Lee, H.K., Pyo, S.H., 2009. A 3D-damage model for fiber-reinforced brittle composites with microcracks and imperfect interfaces. Journal of Engineering Mechanics-ASCE, in press, doi:10.1061/(ASCE)EM.1943.7889.0000039.], incorporating a multi-level damage model and...
Article
Full-text available
This paper presents a micromechanical approach for predicting the elastic and multi-level damage response of aligned and randomly oriented whisker-/ short fiber-reinforced composites. Based on a combination of Eshelby's micromechanics and the evolutionary imperfect interface approach, the effective elastic moduli of the composites are derived expli...
Article
This paper presents the results of an experimental investigation conducted to characterize the joint strengths, peel stresses and failure modes in adhesively bonded double-strap and supported single-lap glass fiber-reinforced polymer (GFRP) joints. The joints were composed of pultruded GFRP adherends having the same stiffness as the members that wo...
Article
An elastoplastic multi-level damage model considering evolutionary weakened interface is developed in this work to predict the effective elastoplastic behavior and multi-level damage evolution in particle reinforced ductile matrix composites (PRDMCs). The elastoplastic multi-level damage model is micromechanically derived on the basis of the ensemb...
Article
This paper proposes a multi-level elastic damage model based on a combination of a micromechanical formulation and a multi-level damage model to predict the effective elastic behavior and progressive weakened interface in particulate composites. The progression of weakened interface is assumed to be gradual and sequential. A multi-level damage mode...