Mohsen A. Issa

Mohsen A. Issa
University of Illinois at Chicago | UIC · Department of Civil and Material Engineering

PhD

About

105
Publications
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1,811
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Publications

Publications (105)
Article
Previous experimental and numerical research studies have investigated the behavior of laterally restrained FRP-reinforced concrete bridge deck slabs under wheel loading. Existing punching shear models are limited in their degree of accuracy due to the normalization approach and lack of consideration of all reinforcement parameters. This paper reit...
Article
This paper presents a comprehensive experimental investigation of the dynamic size effect and fracture characteristics of concrete. The study involves about two hundred concrete specimens with various maximum aggregate sizes subjected to tensile loading ranging over five orders of magnitude. The effect of structural size and aggregate size on the d...
Chapter
In all widely used fracture test specimens, the compressive or tensile stress parallel to the plane of growing crack is negligible, and thus its effect cannot be revealed. The classical fracture models, including the cohesive crack model, cannot capture any effect of such crack-parallel normal stress and strain, except parametrically, because they...
Article
Integral abutment bridges (IABs) are a special type of bridges that are built free of joints on the superstructure to overcome the undesirable consequences associated with conventional jointed bridges. Despite of the proven advantages of IABs, no consensus exists among bridge engineers about design guidelines. This paper presents a parametric study...
Article
The line crack models, including linear elastic fracture mechanics (LEFM), cohesive crack model (CCM), and extended finite element method (XFEM), rest on the century-old hypothesis of constancy of materials’ fracture energy. However, the type of fracture test presented here, named the gap test, reveals that, in concrete and probably all quasibrittl...
Article
Full-text available
This paper investigates the development of compressive strength (fc′), flexural strength (fr), and static elastic modulus (Ec) in relation to the dynamic modulus (Ed) for portland concrete cement (PCC) pavement and patch mixtures. The study in this paper was motivated by the need to establish the less commonly known fr−Ed relationship in comparison...
Article
Full-text available
The content of this document supplements the following research article: Bassim, R., & Issa, M. (2020). Dynamic-and Static-Elastic Moduli and Strength Properties of Early-Age Portland Cement Concrete Pavement Mixtures. Journal of Materials in Civil Engineering, 32(5), 04020066. This document addresses a valid remark raised by the editorial board...
Article
Full-text available
This paper investigates the accuracy of concrete strength estimation using the maturity method (ASTM C1074) for portland concrete cement (PCC) pavements and patches at the stage of early roadway opening to traffic (EOT). An experimental program and an analytical study were developed for this purpose. The experimental program entails four different...
Article
Integral abutment bridge (IAB) length is limited by the lateral displacement capacity of the piles supporting the bridge. This paper presents a numerical study calibrated to experimental tests to investigate the lateral displacement capacity of H-piles (HPs) in integral abutment bridges subjected to combined axial load and cyclic displacement ampli...
Article
This paper reports on a study to determine the effectiveness of using externally bonded carbon-fibre-reinforced polymer composite sheets as a method of increasing the shear strength of reinforced concrete beams. The investigated parameters were the amount and distribution of the composite, the bonded surface and fibre orientation. The overall behav...
Article
Full-text available
Optimizing ultra-high-performance concrete (UHPC) mixture design requires investigating the effect of varying the materials constituents and curing temperature on its mechanical characteristics. Therefore, a comprehensive experimental program was conducted that included studying the effect of varying the materials constituents on the mechanical and...
Article
Full-text available
The overall structural behavior of a totally prefabricated counterfort retaining wall system was examined experimentally and analytically using nonlinear finite element analysis. A 20 ft 2 in. (6.09 m) high, 13 ft 10 in. (4.21 m) wide full-scale prototype was designed meeting the requirements of the AASHTO LRFD speci¬fications, assembled, construct...
Article
This paper investigates the effect of adding inorganic process additions (IPA) and increasing the insoluble residue (IR) on the strength and permeability characteristics of concrete. Also, the effect of supplementary cementitious materials and fine aggregate type is demonstrated. The depth of water penetration per DIN 1048 and the rapid chloride pe...
Article
This paper investigated the impact of room temperature, cyclic ponding salt water (15%), hot water of 65°C, and rapid freeze and thaw cycles for three years on the flexural behavior of reinforced concrete beams strengthened with different configuration of CFRP composites. Totally sixteen RC beams were casted and tested as simply supported load as f...
Article
In this paper, a totally precast concrete counterfort retaining wall system is proposed for highway and bridge applications. This system provides several advantages over conventional methods, such as reduced construction time, cost, and environmental impacts. The system is composed of a precast counterfort wall that is connected to a base slab thro...
Article
This paper investigates the effect of adding inorganic process additions (IPA) and increasing the insoluble residue (IR) on the strength and permeability characteristics of concrete. Also, the effect of supplementary cementitious materials and fine aggregate type is demonstrated. The depth of water penetration per DIN 1048 and the rapid chloride pe...
Article
Full-text available
Replacing cement with limestone and inorganic process additions (IPAs) and increasing the insoluble residue (IR) can aid in reducing the CO2 emission. This paper investigates the effect of adding IPA and increasing IR on the diffusivity characteristics of concrete. Also, the effect of replacing cement with supplementary cementitious materials while...
Article
An analytical model is introduced in this paper to predict the stress–strain behavior of axially loaded circular reinforced concrete (RC) columns with internal longitudinal reinforcement and lateral ties confined by carbon fiber-reinforced polymer (CFRP) composites. The proposed model is a two stage stress strain curve, with a second-order polynomi...
Article
Full-text available
The flexural properties of eight 200 x 300 mm (8 x 12 in.) concrete beams reinforced with basalt fiber-reinforced polymer (BFRP) reinforcing bars were investigated. The beams were reinforced with four different sizes of BFRP (10, 13, 16, and 25 mm). The flexural reinforcement ratios ρf ranged from 1.43 to 10.70 times the balanced ratio ρfb. The bea...
Article
Rail track longevity is a primary concern for the railroad industry in the US. Therefore, it is important to study the rail support system in detail. This includes understanding the interactions between the rail, the different fastening components, and the crosstie. Then evaluate the support system’s long-term performance. Over the past several yea...
Article
The primary objective of this article is to study the effect of beam depth on the performance of shear-deficient beams externally strengthened with carbon fiber–reinforced polymer composites. The investigated parameters include overall behavior up to failure, the onset of the cracking, crack development, and ductility. The experimental results show...
Conference Paper
The interaction between the train, track, and bridge was considered as an interaction between two decoupled subsystems. A first subsystem consisted of the train vehicle simulated as a four-wheelset mass-spring-damper system having two layers of suspensions and ten degrees of freedom. A second subsystem consisted of the track-bridge system assumed t...
Article
Full-text available
The bond strength characteristics between Carbon Fiber Reinforced Polymer (CFRP) and concrete were investigated by conducting double face shear type pullout test. A simplified experimental setup was designed for the test to eliminate the eccentricity of active load across the bond interface. The objective of the study is to determine the ultimate b...
Article
Full-text available
This paper examines the shear strength and behavior of concrete beams reinforced with basalt fiber-reinforced polymer (basalt FRP) bars with and without shear reinforcements. Six 200×300 mm (8×12 in.) and six 300×200 mm (12×8 in.) concrete beams were, respectively, made with and without basalt FRP shear reinforcements. The flexural reinforcement ra...
Article
Railroad spikes represent a vital component of the rail track system, as they fasten the rail to the supporting crossties. Thus, it is important to understand its behavior and effect on the fastening assembly to mitigate any local failure, which, in turn, could lead to system deterioration or damage. Currently, alternative solutions to the traditio...
Article
The use of sand-lightweight concrete made with expanded shale aggregate has become prevalent in recent years. Sand-lightweight concrete is approximately 20% lighter than its normalweight counterpart based on the incorporation of coarse lightweight aggregate. Earthquake forces applied to a building structure are directly proportional to its mass, so...
Article
The effect of temperature on structural materials is a major concern in engineering applications. Thermoplastic composites are highly sensitive to temperature changes and recycled high-density polyethylene (HDPE) is no different in that respect. Temperature variations may alter the mechanical properties for even the best designed HDPE compositions....
Article
Currently, the railroad industry is leaning towards alternative solutions to hardwood timber for crossties applications. This trend is part of an effort to increase train speeds beyond the wooden crossties capacity and minimize the negative environmental effects associated with them. Among the available alternatives are recycled plastic composite c...
Article
The natural frequencies of vibration of short span bridges used in high-speed rail were investigated. Three different models of increasing complexity were evaluated and their effects on the vibration frequency were compared to the first basic model of simply supported Euler-Bernoulli beam. In the second and third cases, the bridge was modeled as an...
Article
Hardwood timber has been the predominant material of choice for crossties since the establishment of the railroad industry in the US. Recently, several concerns, including higher speeds, heavier loads, durability and negative environmental effects associated with deforestation and wood-treating chemicals, have invoked the railroad industry's intere...
Conference Paper
Full-text available
This article is intended to highlight the problems related to incorporating site soil conditions in structural performance. In EGF-based simulated seismograms, the site soil condition inherently exists in small earthquakes used while in theoretical-based Greens' function methods, the synthesized seismogram and the structural performance are strongl...
Article
A total of eight reinforced concrete slabs, 2440×600×125mm strengthened with different layers and configurations of CFRP sheets were fabricated and tested. In addition, nonlinear finite element analysis (NLFEA) using ANSYS package was used to simulate the behavior of the test specimens. After reasonable validation of NLFEA with the experimental tes...
Article
Full-text available
This article is intended to predict a seismogram at sites other than those from which the model is calibrated using the two well-known stochastic point-source and finite-fault approaches. The two models are implemented on the 2005 Zarand earthquake as a case study. For this purpose, the models are validated against recordings at four stations throu...
Article
The paper presents the results of an experimental and analytical study involving the static and accelerated fatigue testing performance of nine reinforced concrete beams externally strengthened with different number and configuration of CFRP sheets. The beams were tested for the stress ranges of 0.25fy–0.35fy, 0.45fy–0.65fy, 0.65fy–0.90fy, and 0.45...
Conference Paper
This paper summarizes the results of comprehensive NLFEA models to evaluate the behaviour of CFRP strengthened beams exposed to environmental conditions in terms of degradation in epoxy bond strength. Based on the NLFEA results and observations from the stress and strain investigations, it was concluded that CFRP repairs and strengthening have exce...
Conference Paper
Nearly 4.2 billion tons of non-hazardous by-products are generated from agricultural, domestic, industrial, and mineral sources and have been used in land filling, due to nonavailability of economically attractive use options. Coal combustion produces minute particles of fly ash that cause huge environmental damage. Land filling is undesirable beca...
Article
Full-text available
This paper provides evaluation and estimation to the shrinkage-induced bond stresses at the interface between bridge deck slab and concrete overlay. In this study, the drying shrinkage-induced bond stresses were estimated through performing 3-dimensional nonlinear finite element analyses (FEA) and through unique modification to Fowler’s guidelines...
Article
Several reinforced lightweight concrete beams were cast with and without CFRP shear strips. The objective of this research is to investigate the shear contribution of the CFRP strips to the ultimate shear strength of the beams. To make full use of the CFRP strips, anchorage at the top sides of the beam webs was provided in the form of CFRP strips a...
Article
Full-text available
Latex-modified concrete (LMC) overlays have performance characteristics that are superior to microsilica concrete (MSC) overlays and other overlay types. LMC provides unique features that are critical for fulfilling the functionality of the overlay. Polymerization of the latex creates a membrane around the LMC particles, resulting in a low-permeabl...
Article
Evaluation of the diffusivity and permeability of high-performance concrete (HPC) was a major task in a comprehensive strength and durability study in the Wacker Drive Viaduct Reconstruction Project in Chicago, III. Two main HPCs were selected. Mixture 1 included 15% slag, 10% fly ash, and 5% silica fume, and mixture 2 included 20% fly ash and 5% s...
Article
This study investigated direct and indirect factors influencing the bond strength between the concrete overlay and the bridge deck by using finite element analysis (FEA) and experimental validation. In addition, it presents reliable guidelines for the required bond strength that is needed for concrete to avoid potential delamination under various p...
Article
This paper presents an experimental and nonlinear finite-element analysis (NLFEA) results of circular short reinforced concrete (RC) columns confined externally with carbon fiber-reinforced polymers (CFRP) subjected to pure axial loading. The experimental program involves the fabrication and testing of 55 specimens wrapped with different number and...
Article
Full-text available
An extensive laboratory experimental program was conducted to develop high-performance fibrous latex-modified concrete (LMC) and microsilica concrete (MSC) overlay mixtures based on target performance characteristics. The designed LMC and MSC overlay normal weight mixtures have the desired workability, 28-day f(')c and f(r) greater than 41 and 4.5...
Article
The influence of mixture type, amount, and type of cementous materials, and the variations among concrete suppliers on the strength and durability characteristics of high-performance concrete was investigated. An extensive study to evaluate the performance characteristics of various HPC mixtures was conducted over a period of more than two years. C...
Article
Full-text available
Plain and fibrous latex modified concrete and microsilica concrete overlays with acceptable laboratory strength and durability characteristics were installed on a full-scale prototype bridge deck for field performance evaluation. After I year of exposure to drying shrinkage, temperature variations, and freeze-thaw cycles, no cracking or debonding w...
Article
The length to diameter ratio (L/d) of cylindrical concrete specimens is the main factor that affects the compressive strength of concrete. A total of more than 200 molded and cored high performance concrete cylinders of 100- and 150-mm diameters with various L/d ratios were tested to failure at 28 and 105 days. The results confirmed that the concre...
Article
The implementation of a prefabricated full-depth precast concrete deck system is an innovative technique that accelerates the rehabilitation process of a bridge deck extending its service life for the purpose of reducing user delays, and community disruptions and lowering its life-cycle costs. A full-scale, two-span continuous prototype bridge 82 f...
Article
A group of five full-depth male-female shear key specimens were match cast and tested to examine the shear capacity of epoxy-jointed single keys. Another group of four specimens were match cast using full-scale dimensions of a segmental construction bridge deck system for testing the fatigue and water tightness at a segment joint. Both cold-weather...
Article
Full-text available
Using full-depth precast concrete panels to replace a bridge deck is an innovative approach. The major advantages of the precast concrete system are speed of construction, durability of the bridge deck, and full composite action between the bridge deck and the precast, prestressed concrete girders. Composite action can be achieved between the preca...
Chapter
Full-text available
Bridges are an integral part of a highway network and represent a multi-billion dollar investment. It is imperative that they are always open to traffic, resistant to natural disaster, and undaunted by millions of loading cycles per year. However, bridges are expensive to maintain and do occasionally fail. Early signs of deterioration are often not...
Article
In this research, a total of 28 full-scale, and quarter-scale push-out specimens were subjected to static loading. Each quarter-scale specimen was composed of a steel beam and two quarter-scale precast panels; each full-scale specimen comprised a steel beam and two full-scale precast panels. Precast panels were attached to the top flange of the ste...
Article
Over the past three decades, bridge deck construction using precast concrete components has become the system of choice for contractors and transportation officials. This preference for precast concrete systems is due to the rapid erection of its relatively lightweight components, reduction in overall mobilization and equipment costs, and structura...
Article
The quantitative description of rough surfaces and interfaces has been an important challenge for many years. This paper addresses the potential application of fractal geometry to characterize the fracture surface and to determine whether there is any correlation between fracture properties and the roughness of the fracture surface. Fractured surfa...
Article
Full-text available
This paper presents research on the behavior of a type of building popular in high seismic zones with a lateral-load-resisting system consisting of masonry-infilled reinforced concrete (RC) frames. Older buildings of this type typically were designed for gravity loads in combination with insufficient or no lateral loads, therefore they do not meet...
Article
In the present work, the distribution of the random toughness characteristics (i.e. critical energy release rate, G1c) has been evaluated on the basis of experimental observations. Fracture test results from three groups of geometrically similar concrete specimens of size (width×total depth×thickness), 420×420×50–1680×1680×200 mm3, made with differ...
Article
Full-text available
This report presents a comprehensive overview of technical information and procedures that are essential for inspecting wood structures and understanding the results. The text addresses wood species characteristics, published structural properties, building code considerations, the effects of environmental factors, and distresses caused by organism...
Article
Test results obtained on the effect of specimen size and aggregate size on concrete compressive strength and modulus of elasticity are presented. The concrete was prepared using 4.75, 9.5, 19.0, 37.5, and 75-mm nominal maximum size aggregate. Over 600 cylinders were cast and tested for concrete compressive strength and modulus of elasticity. Four d...
Article
In the Strategic Highway Research Program (SHRP) a test method for identifying D-cracking susceptible aggregates in approximately eight days was developed to replace the widely used but time-consuming rapid freezing-and-thawing test using ASTM C 666 test methods. The basic assumption in this new method is that the hydraulic pressure expected in con...
Article
This paper presents an investigation on the effects of construction loads and vibrations on typical newly poured reinforced concrete bridge decks. The main objective of this paper was to perform dynamic finite-element analyses of concrete bridge decks under construction loads and vibrations. Two types of bridges were modeled by effectively simulati...
Article
A significant number of highway bridges in the U.S. are in need of replacement or rehabilitation. The rehabilitation process is dependent upon the urgency and magnitude of the damage reported, as well as the type and extent of rehabilitation in terms of time and cost of construction. An effective and economic design concept can be implemented for t...
Article
This paper presents an analysis of the extensive experimental program aimed at assessing the influence of maximum aggregate size and specimen size on the fracture properties of concrete. Concrete specimens used were prepared with varying aggregate sizes of 4.75, 9.5, 19, 38, and 76mm. Approximately 250 specimens varying in dimension and maximum agg...
Article
Full-text available
This paper presents an experimental investigation on the influence of microstructural parameters, such as aggregate size, and macroscopic parameters, such as specimen dimensions, on brittle fracture. Maximum aggregate size was used as a representative parameter of aggregate distribution in agreement with ASTM C[`(GF )]\overline {G_F } indicates th...
Article
The loads, construction procedures, and material behavior influence the performance of the bridge deck as well as its structural integrity. This paper includes a thorough investigation to identify the probable causes of cracking in reinforced concrete bridge decks, particularly at early ages. The objectives of the study were addressed through a lit...
Article
It has been suggested that the reinforcing fiber size and the spacing between the reinforcing fibers play a dominant role in determining the fracture properties of cementitious composite materials. In the present study, 48 specimens were tested under fatigue loading to investigate the effect of fiber size and the corresponding spacing between the r...
Article
The size effect in brittle fracture of rock-type materials is studied by conducting a comprehensive experimental program with concrete specimens of different sizes from materials with different aggregates. Fracture behavior in single edge notched specimens subjected to forces, splitting and compressive along the plane, under displacement control co...