Moncef L. Nehdi

Moncef L. Nehdi
The University of Western Ontario | UWO · Department of Civil and Environmental Engineering

44.23
 · 
PhD, P. Eng. FACI FCSCE

About

371
Publications
133,934
Reads
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5,377
Citations
Introduction
Dr. Moncef L. Nehdi, P. Eng. is a Professor at Western University, Canada. He was Technical Director for Imasco Minerals and for MTL. He is a Fellow of ACI and CSCE and recipient of several awards, including the CSCE Horst Leipholz Medal and Whitman White Award, ICE's Bill Curtin Medal, the Ontario Premier’s Research Excellence Award and the ACI Young Member Award for Professional Achievement. A prolific author with more than 300 publications, he ranked in the world’s most cited civil engineers
Research Experience
July 1999 - present
Western University
Position
  • Professor (Full)
Education
September 1993 - April 1998
University of British Columbia - Vancouver
Field of study
  • Civil Engineering
January 1991 - August 1993
Université de Sherbrooke
Field of study
  • Civil Engineering
January 1987 - December 1990
Laval University
Field of study
  • Civil Engineering

Publications

Publications (371)
Article
Full-text available
Steel corrosion induces distress in concrete structures, resulting in the cracking and spalling of the concrete cover, which accelerates further damage. Chloride ions (Cl–) and carbonation are the primary causes of steel corrosion in concrete. This study investigates the effects of Cl– in precast concrete tunnel lining (PCTL) segments through condu...
Article
Despite that considerable research has explored self-healing of portland cement-based materials, potential self-healing in alkali-activated binders remains largely unexplored. Therefore, this paper deploys a wide array of experimental techniques to investigate the self-healing properties of PVA fibre-reinforced alkali-activated slag-based composite...
Article
Using single elliptical (SE) cage reinforcement in reinforced concrete pipes (RCP) can reduce both the needed reinforcing steel and labor for manufacturing double and triple steel reinforcing cages. However, there is currently no robust tools to predict the structural behavior of RCP with SE reinforcement. In this study, non-linear 3D finite elemen...
Article
Reinforced Concrete Pipe (RCP) with single elliptical (SE) reinforcement offers cost savings and is permitted by Canadian and American standards. Yet, its use has not yet gained momentum primarily due to limited knowledge of its structural performance. This study explores the structural behavior of full-scale 1050 mm and 1200 mm diameter RCP reinfo...
Article
The annual production of sugarcane in Brazil is estimated at around 646 million tons and contributes around $US 43.8 billion of gross domestic product. Around 80% of Brazil’s biomass electricity is generated from sugarcane bagasse. However, the process of generating energy from bagasse using calcination leads to a by-product residue, sugarcane baga...
Article
With several countries halting coal combustion in favor of clean and renewable energy production, there is need for alternative mineral additions that can substitute for fly ash in concrete and bring about similar benefits. This study explores using waste-marble powder (WMP) as an economical and eco-friendly method for controlling the alkali-silica...
Article
Accurate prediction of the mechanical properties of concrete has been a concern since these properties are often required by design codes. The emergence of new concrete mixtures and applications has motivated researchers to pursue reliable models for predicting mechanical strength. Empirical and statistical models, such as linear and nonlinear regr...
Article
Hydrostatic joint performance for infiltration is a key design requirement for a reinforced concrete pipe (RCP) to withstand in situ groundwater pressure. However, current standards and test methods adopted by RCP manufacturers do not adequately consider this requirement, leading to higher risk of leaky joints. Moreover, existing in-field evaluatio...
Article
Full-text available
The large portfolio of aging highway bridges worldwide includes many reinforced concrete T-section beams with various levels of damage and degradation. However, there is currently dearth of research on the anchoring behavior of CFRP sheets used for strengthening such RC T-section beams. Moreover, there is a need for rational and accurate analytical...
Article
Full-text available
The eco-efficiency and economy of geopolymer composites largely depend on their alkaline activator dosage. In this study, the effect of applying a pre-setting pressure and variation of the aggregate-to-fly ash ratio on the alkaline solution dosage and mechanical strength of fly ash-based geopolymer composites was explored. It is shown that through...
Article
Full-text available
This study investigates the behavior of cast-in-situ masonry cavity walls subjected to in-plane quasi-static loading. Thirteen cast-in-situ masonry cavity walls and one solid wall were tested under combined axial and quasi-static lateral loads. Test parameters included the tie shape, tie layout, thickness of the insulating layer, and the level of a...
Article
Full-text available
Synopsis: Bridge deck condition rating systems commonly use measurements of obvious defects recorded through visual investigation. Accordingly, the condition of bridge decks is rated linguistically with inherent vagueness in the description of the deck condition. Although several advanced non-destructive testing (NDT) technologies have emerged for...
Article
The bond stress of a reinforcing bar in a cementitious matrix varies along the bar length and is difficult to quantify. Thus, design code provisions refer to the concept of bar development length and rely on statistical analysis of rebar-pull-out test results. In the present study, a novel data-driven predictive model based on Polynomial Chaos Expa...
Article
In-situ load testing allows for assessment of the adequacy of existing structures with insufficient design information or unknown internal material deterioration history. In this study, flat slabs of an existing reinforced concrete (RC) building were evaluated using in-situ load testing per the ACI-318 test procedure. The tested structure had five...
Book
Full-text available
To improve the eco-efficiency and sustainability of concrete, the cement and concrete industry can exploit many byproducts in applications that could, in some cases, outperform conventional materials made with traditional ingredients. This Special Publication of the American Concrete Institute Committee 555 (Concrete with Recycled Materials) is a c...
Article
Applications of phase change materials (PCMs) have become of great interest in recent years owing to beneficial effects on the thermal, mechanical and durability properties of construction and pavement materials. PCMs can alter the thermal mass and thermal inertia of building materials, thus enhancing thermal energy storage. The effects of PCMs on...
Article
Design code provisions for reinforced concrete are often based on empirical relations resulting from simple statistical treatments of experimental data. Hence, they may provide inaccurate results for predicting complex structural behavior. In the present study, novel nonlinear regression for prediction of the reinforcing bar development length is d...
Article
Full-text available
This study explores highly eco-efficient preplaced aggregate concrete mixtures having superior tensile characteristics and impact resistance developed for pavement and infrastructure applications. A fully recycled granular skeleton consisting of recycled concrete aggregate and recycled tire rubber granules, and steel wire fibers from scrap tires ar...
Article
Full-text available
Grouted dowel connections are used extensively in precast load bearing walls owing to their simple construction and forgiving tolerances. Current design guidelines do not adequately consider the composite nature of such connections. Moreover, robust numerical models for these connections are yet to be developed. Therefore, a finite element model of...
Article
Full-text available
Grouted dowel connections are used extensively in precast load bearing walls owing to their simple construction and forgiving tolerances. Current design guidelines do not adequately consider the composite nature of such connections. Moreover, robust numerical models for these connections are yet to be developed. Therefore, a finite element model of...
Article
Self-healing efficiency ofcement-based materials has so farbeen evaluated mostlythrough the healing ofsurface cracks, without adequately capturing the dominant effects of environmental exposure or accurately quantifying the volume of cracks healed. In addition, the effects of diverse additions such as silica-based materials, swelling agents, and carbon...
Article
Full-text available
An engineered cementitious composite, endowed with strain recovery and incorporating hybrid shape memory alloy (SMA) and polyvinyl alcohol (PVA) short fibers, was subjected to drop weight impact loading. Numerical simulation of the composite's impact behavior was performed, and the model predictions agreed well with the experimental findings. Numer...
Chapter
Bridge deck condition assessment is commonly conducted through visual inspection by bridge inspectors. Considering the colossal backlog of aging bridge structures, there is a need to develop cost-effective and innovative solutions to evaluate bridge deck conditions on regular time intervals, without interrupting traffic. This makes remote sensing t...
Article
Full-text available
Bagasse is biomass residue generated on extraction of juice from sugarcane. It is commonly used as fuel for electricity generators, and its calcination produces sugarcane bagasse ash (SCBA). Finely ground SCBA can be used as partial replacement for cement. In this study, the effects of SCBA incorporating different quartz contents on properties of c...
Article
The grouted dowel connection has been simple, cost-effective, and widely used in precast concrete structural systems. The grouted bar length in this connection is currently designed similarly to a regular steel bar in reinforced concrete. This underestimates the connection's bond strength, thus resulting in excessive connection length. The effect o...
Article
Full-text available
The risk of alkali–silica reaction of concrete aggregates in many parts of the word remains largely unexplored. In particular, a suitable test approach for testing aggregates with marginal to moderate alkali–silica reactivity has not been clearly identified. In this study, the mineralogical compositions of aggregates from five different quarries we...
Article
Grouted dowel connections are widely used to resist tension induced by in-plane straining actions and to provide ductility to precast concrete load bearing wall structures. Yet, such connections have not yet been duly investigated. Current design code and standard provisions treat it similar to a simple bar-in-concrete detail. The present study rep...
Article
Full-text available
One quarter of bridges in Canada and the United States need repair. The present study provides a critical overview of the state-of-the-art existing condition assessment techniques for reinforced concrete bridges, with an emphasis on current practice in North America. The techniques were classified into five categories, including visual inspection,...
Conference Paper
Full-text available
The hydrostatic performance of reinforced concrete pipe (RCP) depends on the gasket design and its materials properties, the joint design and its quality, the joint dimensional tolerance during pipe manufacturing, and more importantly, the quality of the concrete pipe installation. Existing specifications pertinent to testing RCP joint performance...
Conference Paper
Full-text available
In the present study, self-healing of cracks in concrete under different environmental exposure was investigated. Pre-cracked mortar specimens were exposed to three different environmental conditions including cyclic temperature/relative humidity, cyclic wetting/drying, and continuous submersion in water. Change in crack width in each specimen due...
Article
Full-text available
Reinforced concrete pipe (RCP) standard guidelines and industry practice have rather been disconnected from the end-users' expectations. No genuine effort has so far been made to create synergy between the expertise gained and advances made around the world. With the advent of strong competition from flexible pipe products and changing end-user exp...
Conference Paper
Full-text available
Bridge decks are deteriorating at an alarming rate due to corrosion of the reinforcing steel, requiring billions of dollars to repair and replace them. Nowadays, infrared thermography (IRT) diagnostics represent a mature high-technology field that combines achievements in the understanding of heat conduction, material science, and computer data pro...
Conference Paper
Full-text available
The automated data collection of civil infrastructure projects, whether under construction, newly put into service, or in operation has been receiving increased attention by researchers and practitioners. Such real-time progress tracking is essential for the active monitoring of production during the construction phase of a project and for the buil...
Article
Despite abundant literature on self-healing of cement-based materials, there is dearth of information on how environmental exposure affects self-healing. In this study, self-healing of cracks in cement mortar under different environmental exposure was investigated. Pre-cracked mortar specimens were submerged in water, while identical specimens were...
Article
Full-text available
The analysis of Infrared thermography (IRT) data to evaluate the condition of concrete bridge decks still relies on user interpretation of thermal images. Delaminations are commonly defined based on the pixels associated with temperatures higher than predefined threshold values that are arbitrarily selected. Such a subjective scheme can produce inc...
Article
To create composite behaviour in precast concrete panel construction, grouted dowel connections are widely used owing to their simplicity and ability to divert damage from panels during excessive deformation. Yet, current design codes treat this connection as a bar-in-concrete idealization, disregarding the sleeve confinement and composite behaviou...
Article
Full-text available
The structural integrity of precast concrete tunnel lining (PCTL) segments largely depends on its durability performance. The ingress of chloride ions into PCTL segments can induce reinforcement corrosion, which has been the primary cause that jeopardizes the structural safety of PCTL. This study explores the mechanical behavior of specimens extrac...
Article
Owing to its exceptional strain capacity, which can reach hundreds of times that of normal concrete, and its reduced crack width, engineered cementitious composites (ECC) are a very promising solution for mitigating many of the problems that generate colossal backlogs of deteriorated concrete structures worldwide. However, research is needed to dev...
Article
This study explores the development of eco-friendly burnt clay bricks incorporating recycled waste marble powder (WMP). WMP was collected from local marble industry and used to manufacture brick specimens at a local brick manufacturing facility with dosages ranging from 5% to 25% by clay weight. The mechanical and durability performance of bricks i...
Article
Full-text available
Extreme loading events such as blasts, impacts and earthquakes often lead to the partial or total collapse of reinforced-concrete structures, resulting in economic and human life losses. Civil engineers have therefore been seeking innovative materials and systems that would allow the design of resilient and smart structures that can withstand such...
Article
Full-text available
Precise evaluation of the condition of RC bridge decks, particularly for corrosion-induced delaminations, is decisive for ensuring bridge performance and safety. Although infrared thermography (IRT) and ground penetrating radar (GPR) have considerably aided this task, cogent procedures for deciphering their data have yet to be developed. Postproces...
Article
Full-text available
In this research, a machine learning model namely extreme learning machine (ELM) is proposed to predict the compressive strength of foamed concrete. The potential of the ELM model is validated in comparison with multivariate adaptive regression spline (MARS), M5 Tree models and support vector regression (SVR). The Lightweight foamed concrete is pro...
Article
Full-text available
The colossal backlog of deteriorated concrete bridge decks draws attention to the importance of nondestructive testing (NDT) technologies as potential bridge condition assessment tools. The selection of NDT techniques to evaluate the current state of bridge decks is a decision variable. The foremost objective of this study was to conduct a comparat...
Article
Most commonly used bridge condition rating systems utilize data emanating from visual inspection reports, inevitably associated with considerable uncertainty. This could possibly lead to unnecessary repair actions or overlooking critical problems. Although the advent of nondestructive testing (NDT) technologies has significantly aided more precise...
Article
An innovative hybrid engineered cementitious composite with crack-healing capability is pioneered in this study. The mechanical properties of this composite, which incorporates short randomly dispersed polyvinyl alcohol (PVA) and shape memory alloy (SMA) fibers were investigated. Results show that a combination of PVA and SMA fibers significantly e...
Article
A novel eco-efficient technology for the construction of pavements and sidewalks using high recycled volume Two-Stage Concrete is proposed. Two-Stage Concrete is a special type of concrete, which is distinguished by its high coarse aggregate content and exceptional placement, whereby aggregates are first pre-placed in the mold then injected with a...
Article
Full-text available
Most commonly used bridge condition rating systems utilize data emanating from visual inspection reports, inevitably associated with considerable uncertainty. This could possibly lead to unnecessary repair actions or overlooking critical problems. Although the advent of nondestructive testing (NDT) technologies has significantly aided more precise...
Article
This study pioneers the concept of fibre-reinforced preplaced aggregate concrete through premixing and preplacing steel fibres with aggregates in the formwork, then injecting a flowable grout. Unlike in conventional steel-fibre reinforced concrete where the fibre dosage, length and aspect ratio are hampered by workability considerations, the influe...
Article
Full-text available
The present study explores the potential application of unmanned aerial vehicle (UAV) Infrared Thermography for detecting subsurface delaminations in concrete bridge decks, which requires neither traffic interruption nor physical contact with the deck being inspected. A UAV-borne thermal imaging system was utilized to survey two in-service concrete...
Article
Two-stage concrete (TSC), also known as preplaced aggregate concrete, is produced through placing coarse aggregate particles in the formwork and subsequently injecting grout to fill the interparticle voids. The ability of the used grout to flow around the preplaced aggregate particles and effectively fill voids has a predominant effect on the TSC p...
Article
Full-text available
It has been well established that supplementary cementitious materials (SCMs) can significantly enhance the resistance of concrete to chemical sulfate attack. However, the effect of SCMs on the durability of concrete exposed to physical salt attack is still controversial. To date, there have been only limited studies that have investigated this con...
Article
You can view a full text of this article using this link: https://link.springer.com/epdf/10.1617/s11527-017-1056-0?author_access_token=JykI8CfkfUPn2LQVUPCAw3k_ZoEKMXbDGXWx5s5gP1ZaxkW4ju7YlcHmwIkgM05BEIg9q5N2GYdGm4wkR2aUuwNfun8F2wWi67MBHLDj6-xVj-nJ0Zyvs31ngdFArhADOgjj_HEZiN7muOTGprBJxA%3D%3D Owing to its forgiving tolerances and eliminating the n...
Conference Paper
Full-text available
Recently, the development of self-healing concrete has become an area of great attention. Achieving such a goal can save substantial repair costs and reduce worldwide green house gas emissions from new construction and repair work. In the present paper, the application of artificial neural networks (ANNs) to predict the self-healing of concrete is...
Conference Paper
Full-text available
In this study, the effect of fire on the impact resistance of a novel hybrid fiber-reinforced engineered cementitious composite incorporating short randomly dispersed shape memory alloy and polyvinyl alcohol fibres (HECC-SMAF) was investigated. A two-parameter Weibull distribution was used to analyze variations in experimental results in terms of r...
Article
There is currently dearth of information on the durability of two-stage concrete (TSC) to physical and chemical sulfate exposure. TSC differs from conventional concrete in many ways including its placement technique, high aggregate content and the use of very flowable grout. Therefore, available data on the behavior of conventional concrete under s...
Article
There is currently dearth of information on the durability of two-stage concrete (TSC) to physical and chemical sulfate exposure. TSC differs from conventional concrete in many ways including its placement technique, high aggregate content and the use of very flowable grout. Therefore, available data on the behavior of conventional concrete under s...
Article
h i g h l i g h t s Effect of subfreezing temperature on grouted dowel connections was explored for the first time. Bond strength was proportional to compressive strength square root after early-age subfreezing. Bond stress-slip response was unchanged after exposure to early-age subfreezing conditions. Initial normal temperature curing period was c...
Article
Burnt clay bricks are commonly used in construction across the globe. The objective of this study is to explore the potential of using waste glass sludge (WGS) as a secondary material in clay brick manufacturing. WGS was collected during industrial-scale cutting and polishing of glass. Brick specimens were manufactured using various dosages (i.e. 5...
Article
Full-text available
Synopsis: Bridge deck condition assessment is commonly conducted through visual inspection by bridge inspectors. Considering the colossal backlog of aging bridge structures, there is a need to develop cost-effective and innovative solutions to evaluate bridge deck conditions on regular time intervals, without interrupting traffic. This makes remote...
Book
With increasing world population and urbanization, the depletion of natural resources and generation of waste materials is becoming a considerable challenge. As the number of humans has exceeded 7 billion people, there are about 1.1 billion vehicles on the road, with 1.7 billion new tires produced and over 1 billion waste tires generated each year....
Book
Full-text available
With increasing world population and urbanization, the depletion of natural resources and generation of waste materials is becoming a considerable challenge. As the number of humans has exceeded 7 billion people, there are about 1.1 billion vehicles on the road, with 1.7 billion new tires produced and over 1 billion waste tires generated each year....
Article
Full-text available
This paper presents an approach to predicting the intrinsic self-healing in concrete using a hybrid genetic algorithm–artificial neural network (GA–ANN). A genetic algorithm was implemented in the network as a stochastic optimizing tool for the initial optimal weights and biases. This approach can assist the network in achieving a global optimum an...
Article
Two-stage concrete (TSC), also known as pre-placed aggregate concrete, is characterized by its unique placement technique, whereby the coarse aggregate is first placed in the formwork, then injected with a special grout. Despite its superior sustainability and technical features, TSC has remained a basic concrete technology without much use of mode...
Article
Two-stage concrete (TSC), also known as pre-placed aggregate concrete, is characterized by its unique placement technique, whereby the coarse aggregate is first placed in the formwork, then injected with a special grout. Despite its superior sustainability and technical features, TSC has remained a basic concrete technology without much use of mode...
Article
Full-text available
Conference Paper
Full-text available
The premature deterioration of concrete bridges is one of the most serious problems currently facing several highway authorities. The detection of subsurface fracture planes, or delaminations, is necessary when prioritizing bridges for repair. Delaminations are commonly detected by manual methods, such as a sounding rod or a chain drag, which are s...
Conference Paper
Full-text available
Bridge decks in Canada are deteriorating rapidly due to exposure to various degradation mechanisms. Exposure to freezing and thawing cycles coupled with the ingress of chloride ions from de-icing salts used during winter seasons typically damage bridge decks at a higher rate than other bridge components. Recently, there has been an increase in the...
Article
Full-text available
The lining system in tunnel infrastructure is very important as it provides the first line of defense against overburden loads and complex geotechnical surrounding conditions. In this study, conventional reinforced concrete (RC) and steel ! ber-reinforced concrete (SFRC) precast tunnel lining (PTL) segments were investigated for mechanical and dura...
Article
Full-text available
In this study, an extensive literature review has been conducted on the material characterization of UHPC and its potential for large-scale field applicability. The successful production of ultra-high performance concrete (UHPC) depends on its material ingredients and mixture proportioning, which leads to denser and relatively more homogenous parti...