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Civil Engineering

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https://hdl.handle.net/10315/34418

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Now showing 1 - 20 of 100

Open Access
Development of a Kinetically Engineered Microbial Community for Nitrite Shunt as a B-Stage Process Using Different Aeration Strategies
(2024-03-16) Soliman, Moomen Mahmoud Moharram Abdallah; Eldyasti, Ahmed K.
Nowadays, depleted energy resources, increasing worldwide energy demand and global climate change has been witnessed. In accordance, wastewater treatment plants (WWTPs) have prioritized minimizing its energy use, maximizing resources recovery, while efficiently treating the received wastewater. Shortcut BNR (SBNR) has been proposed as an energy-efficient nutrients removal process towards lowering the energy use of the current WWTPs. Nonetheless, full-scale implementation of SBNR in mainstream conditions has been hindered by the major challenge of nitrite oxidizing bacteria (NOB out-selection. To address such a key bottleneck, this dissertation proposes, for the first time, a novel kinetic-adaptation based strategy to engineer the microbial community to maintain NOB out-selection at mainstream conditions. The successful implementation of such a strategy and its underlying mechanisms was demonstrated and investigated for more than 400 days. In result, an ammonia removal efficiency of 99.4±0.4% and nitrite accumulation rate of 87.4±0.6% under low DO levels of 0.1–0.2 mg/L was reached. Afterwards, the potential to employ the developed strategy to perform mainstream nitrite shunt was investigated considering the limited carbon availability in the A-stage effluent, its fractionation, and the applied aeration strategy. At carbon to nitrogen (C:N) ratio as low as 6.0, ammonia, COD and total inorganic nitrogen (TIN) removal efficiencies of 99.2±0.7, 94.0±0.1 and 93.2±1.6% were successfully achieved under continuous low DO aeration strategy. Investigations revealed that maintaining NOB suppression played a key role in achieving high TIN without the need for external carbon addition. Two more aeration strategies were investigated, low DO intermittent aeration and high DO intermittent aeration. At C:N ratio as low as 6, higher TIN removal of 95.8±0.9% was achieved at low DO compared to high DO which achieved a TIN removal of 73.8±1.7%. Therefore, it was concluded that the developed kinetic-adaptation strategy can be utilized along with different aeration strategies with slight advantage to low DO intermittent aeration for its higher TIN removal with limited carbon. The findings of this dissertation present a novel strategy that blaze a trail to overcome the major bottleneck of NOB out-selection to implement nitrite shunt at mainstream as energy and resources efficient B-stage process.
Open Access
Understanding Freight Fluidity in Peel Region with Emphasis on Arterial Roads
(2024-03-16) Jain, Prateek; Park, Peter Y.
This thesis examines the concept of freight fluidity and seeks to analyze the correlation between truck collisions and freight fluidity measures in the Region of Peel. The study employed a multidisciplinary approach, incorporating data processing, visualization, and correlation techniques. The research involved developing a dashboard that depicts freight fluidity measures and truck collisions. A descriptive data analysis was conducted to identify trends related to freight fluidity measures and collisions. The maximum congestion for trucks was observed in the afternoon period. Brampton showed the highest level of congestion and collisions among all the municipalities. By statistically analyzing the correlation between freight fluidity measures and truck collisions, the study provided insights into how freight fluidity can lead to safer and efficient freight transportation. A statistically significant correlation was observed between collisions and freight fluidity measures. The findings of this thesis will provide valuable insights for transportation planners in the Region of Peel.
Open Access
Performance Assessment and Retrofit Strategies for Unreinforced Masonry Structures
(2024-03-16) Pezeshki, Mina; Pantazopoulou, Stavroula
This research project provides a detailed investigation into the seismic assessment of Unreinforced Masonry (URM) heritage structures, emphasizing their cultural and historical importance and vulnerability to earthquakes. It focuses on advanced seismic evaluation methods, including 3-D finite element modeling, to address specific challenges such as the unique characteristics of these buildings, like distributed stiffness and mass, and the absence of diaphragm action. The project aims to bridge knowledge gaps in the dynamic, nonlinear behavior of URM structures during seismic events, and involves comparative evaluation of different computational modeling methods. Additionally, it addresses the calibration and validation of computational models, analysis of dynamic response and failure characteristics, and evaluates retrofitting strategies to mitigate seismic risks. The research aligns with international preservation conventions and aims to contribute to the effective seismic risk mitigation strategies for unreinforced masonry heritage buildings.
Open Access
Experimental Investigation on Microplastics Biofouling Rate in an Aquatic System
(2024-03-16) Mohammadiun, Malihe; Karimpour, Shooka; Brar, Satinder
Microplastics (MPs), small plastic particles under 5 millimeters, are a growing environmental concern in freshwater and marine ecosystems. They originate from numerous sources, can easily move due to their small size, and hold the potential to transport pollutants through their movements in marine and freshwater ecosystems. Hence, formulating the distribution and movement of these microplastics within aquatic environments is very important. However, MP distribution and mobility in water are complex processes which depend on many environmental and physical factors. One of the factors contributing to the dynamic nature of microplastics is biofouling. Biofouling, a process where MPs undergo surface changes and accumulate microorganisms, is a key factor influenced by factors like size, shape, and environmental conditions. Water quality in Lake Ontario is impacted by urban and wastewater discharge and across the lake MPs are reported at different levels. The wastewater effluent influences biofilm formation on MPs and in turn, affects their movement in the lake. Despite increased research on microplastic biofouling in freshwater, a significant research gap still exists especially in experimental works. To address this gap, in this study, a series of lab-based experiments, simulating Lake Ontario conditions, were conducted to analyze bacterial growth and biofilm formation on different microplastic sizes. The study investigated factors such as bacteria type, nutrient availability, shaking speed, microplastic size, and flow rate on MP biofouling formation and growth. This study highlights the significance of biofouling on microplastics, focusing on how bacterial competition, nutrient supply, and the rate of water flow affect the formation of biofilms. This understanding is crucial for addressing hydro-environmental issues related to biofouling and microplastics, providing insight into mitigation measures.
Open Access
An analysis of 100 years of post-fire streamflow responses of British Columbia watersheds
(2024-03-16) Abogadil, Karen Elaine; Khan, Usman T.
Wildfires are becoming larger and more severe due to climate change. This trend is destructive to the forest ecosystem, disrupting many eco-hydrologic processes in forested watersheds. Effects can include rapid runoff responses, increased surface runoff, and elevated erosion, leading to lower water quality and long-lasting effects on hydrologic ecosystem services (such as flood regulation). However, post-fire hydrology studies often have variable and contrasting results, making cross-study comparisons difficult. Studies are typically short-term and focused on single wildfire events. This research aims to determine accurate indicators for post-fire flow responses. The study area includes 257 drainage basins (grouped into five ecozones) in British Columbia, Canada, known for its susceptibility to wildfires and floods. The study analyzes wildfire data from 1910 to 2020. Post-fire percent changes for four hydrological metrics (low, high, peak flows and runoff ratio) were calculated using pre-fire and post-fire values for multiple temporal bands. Using streamflow, precipitation, temperature, wildfire perimeters, and topographic data, statistical analyses including hypothesis testing and multiple linear regression were done. The two-sample Kolmogorov-Smirnov test results comparing the fire group against the two control groups resulted in highly variable p-values. Multiple linear regression was done to predict the percent changes for all flows. Regression yielded poor model performance, suggesting that the hydrometeorological parameters alone cannot explain the post-fire changes observed. The most frequently influential watershed indicators in post-fire streamflow responses were percent burn, maximum daily temperature, and elevation. Results across multiple temporal bands, ecozones and hydrological metrics over 100 years will aid future research on the wildfire effects on hydrology in forested watersheds.
Open Access
Analysis of Drinking Water Distribution Systems using the Engineering Design Process
(2024-03-16) Moghaddam-Ghadimi, Sara; Gora, Stephanie
Our research has identified that issues pertaining to distribution infrastructure are a leading cause of water safety vulnerability. These challenges are exacerbated within small communities which experience a disproportionate number of boil water advisories compared to larger communities. This study used the engineering design process to explore the root causes and potential solutions to water safety hazards within the water distribution system. A systematic literature review thoroughly examined data-backed evidence of issues causing potential threats to drinking water safety. Potential solutions involving the implementation of distributed treatment using UV LEDs installed at different points in the distribution system were identified through research and stakeholder consultation and compared to one another using EPANET software. The results of this analysis indicated that installing UV LEDs at the point-of-entry could potentially be used to reduce the impact of water safety hazards within the distribution system.
Open Access
Optimizing Truck Parking Facilities with Major Distribution Centres in Pandemic Conditions
(2024-03-16) Annalingam, Elanakayon; Park, Peter; Gingerich, Kevin
The Covid-19 pandemic has had a disproportionate impact on truck drivers facing inadequate rest space availability due to exacerbated by pandemic conditions. GPS data is used in this thesis to understand trends of freight parking and the critical locations in which freight activity is occurring. The data is also used to compare pre-pandemic patterns in 2019 with pandemic conditions in 2020. An optimization scheme is developed using a P-median approach to optimize travel from rest areas to major distribution centres. This scheme identifies the best locations where truck drivers can park and rest before accessing distribution centres. It is also proposed to be used to identify top locations for potential expansion for rest areas. The Region of Peel is used as the study area for this analysis as a major freight centre and documented impact from the Covid-19 pandemic.
Open Access
Biodegradation of Perfluorocarboxylic Acid in Landfill Leachate
(2024-03-16) Shu, Xuhan; Brar, Satinder K.
Long-chain perfluoro carboxylic acids (LC-PFCAs), a subset of perfluorochemicals (PFCs), were identified in landfill leachate during the sampling period from June 2022 to July 2023. In this thesis, the exclusive focus is on the chemical degradation of PFCAs, omitting biological degradation experiments due to their persistent nature. The leachate analysis revealed a seasonal fluctuation in its chemical characteristics including nitrogen, phosphate, alkalinity, pH, and chemical oxygen demand (COD). Interestingly, the selected C9 and C10 LC-PFCAs were consistently present in the leachate but did not show any significant seasonal variation. Concentrations of LC-PFCAs ranged from 100 ng/L to 800 ng/L. To assess the biodegradability of C9 and C10 PFCA in the leachate using native microorganisms, a bench-scale experiment was conducted. The microbial community exhibited biphasic growth when exposed to the specified PFCAs (10-100 mg/L) for 6 days. Notably, the C9 and C10 PFCAs displayed a biodegradation efficiency of up to 58% within this 6-day period.
Open Access
Spatialized probabilistic flood risk assessment in urban areas protected by levees
(2024-03-16) Mainguenaud, Florence Marianne; Khan, Usman T.; Sharma, Jit
Flood hazard assessment is a necessary input to a flood risk assessment. Integrated flood hazard assessment methods provide a good overview and distinguish three steps: assessment of the flooding event probability, reliability assessment of the flood defense system, flood propagation using numerical simulations. Flood hazard assessment results in one or several flood maps, each dependent on the intensity and duration of the modeled flooding event. A definition of flood risk assessment is the combination of hazard, exposure, and vulnerability. We identified several gaps in each step of the flood risk assessment process. Gaps found in flood hazard assessment include: the lack of decisive method to estimate a combined levee failure probability of various failure mechanisms and few probabilistic flood hazard assessments include levee failure scenarios. One of Integrated Flood Risk Management (IFRM) aims is to provide a standard for risk assessments to enable comparisons between different studies and better management on the long run. To address those gaps, we propose a method, which estimate earthen levee failure probabilities for several return periods and failure mechanisms (backward erosion, slope stability, and overflow). We used limit equilibrium method and Monte-Carlo simulations to estimate sliding failure, compared seepage gradients to a critical gradient to estimate backward erosion failure, and used expert judgment to estimate overflowing failure probabilities. We aggregated failure mechanism probabilities into a global fragility curve using Monte-Carlo simulations, hence providing a comprehensive fragility curve for an earthen levee segment. We defined several scenario of flood and levee failure for backward erosion and overflowing mechanisms to compute a probabilistic flood hazard map. We modeled six flood events, each challenging the levee reliability, enabling the breaching of each levee segment. For each scenario, the resulting flood maps of water depth and velocity are associated with a flood occurrence probability and a levee failure probability. The maps are combined into a single probabilistic flood hazard map where for each pixel, a cumulative probability curve of depth and velocity is available. Future works will propose a probabilistic flood risk map building on the probabilistic flood hazard method, and applying new vulnerability considerations.
Open Access
Numerical Evaluation of Square Reinforced Concrete Slabs Incorporating High Volumes of Recycled Materials
(2024-03-16) Ikpotokin, Peace Osalumhense; Butler, Liam J.
Concrete remains the most widely used building material in the world, due to its locally available constituent materials, versatility of form and shape, functionality, and durability. However, due to the processes involved in the manufacturing of cement, the sustainability of concrete both globally and in local communities, is often called into question. Cement production accounts for approximately 7 percent of CO2 emissions globally and, as the resources required for concrete production (e.g., aggregates, sand, potable water, etc.) continue to diminish, this poses a series problem for the long-term viability for the concrete construction industry. A three-pronged solution to this problem is therefore required which focuses on reducing, reusing, and recycling our concrete infrastructure. As urban populations are only expected to increase in the coming decades, concrete structures will continue to be constructed. This research is aimed at investigating the flexural response of two-way slabs produced using low-carbon concrete (LCC) containing recycled and secondary materials. Given that concrete floor slabs account for the largest portion of concrete in a typical building, the use of LCC in slabs has the potential to have a significant reduction in the structure’s overall CO2 footprint. The primary objective of this research is to examine the effects of replacing portland cement with high volumes of slag, fine and coarse recycled concrete aggregates (RCAs). To address the main research objective, a three-phase experimental program was completed. The first phase involved the material characterization of the various constituent materials including cement, slag, natural sand, natural coarse limestone aggregates, and fine and coarse RCAs. The second phase focused on concrete mixture design development. An experimental matrix included the batching and testing of several low carbon concrete mixtures consisting of one target strength class (30 MPa) and combinations of up to 100% replacement of natural limestone and sand with fine and coarse RCAs and up to 50% replacement of portland cement with ground granulated blast furnace slag. The next phase of experimental testing program was then completed to help better understand the individual and combined effects of the various constituent materials on fresh (e.g., slump, density, air content) and hardened concrete properties (e.g., compressive and splitting tensile strength) of low carbon concrete. Based on the top performing concrete mixtures, the third phase incorporated their measured material properties into a finite element model. Four two-way slabs (one control slab and three slabs containing different LCC mixtures) were then analyzed to evaluate and compare the maximum flexural capacity, deformational characteristics, and crack patterns. The obtained flexural and deformation response of the slabs were then compared with results obtained from the yield line analysis, Response 2000 sectional analysis which is based off the moment capacity and results were compared to CSA empirical code equations. Findings showed that firstly, the predicted pattern of failure from the finite element analysis was in concordance with that of the yield line analysis, secondly an inverse relationship between density LCC and the replacement ratio of recycled/secondary materials was obtained, and thirdly, that 50% of the numerical deflection values were in alignment with ACI crossing beam method. In terms of flexural capacity, relatively low decreases in load of 4.6%, 8.7%, and 9.8%, were computed for LC-C, LC-CF, LC-CFS, respectively. These results are promising for demonstrating the feasibility of utilizing LCC incorporating high volumes of recycled and secondary materials in two-way slab systems.
Open Access
BIM and Fire Safety Engineering for Wood Structures
(2023-12-08) Davidson, Anne Charlette; Gales, John A.
This thesis provides a map for Fire Safety Engineering (FSE) practitioners who are navigating the complicated and under-studied research area of mass timber in fires and how such a project would fit into the BIM design process. The thesis expands the field of knowledge on how architectural features correlate with fire dynamic outcomes of full scale CLT compartments, provides baseline fire metrics for Eastern Hemlock without any existing published data, and provides a wholistic interpretation of the performance of a traditional mortise and tenon timber frame connection in a fire test, also without any existing publications. The thesis also provides an option for how each project might be included in BIM and any research or requirements that would allow for total integration, as well as the potential benefits.
Open Access
A Holistic Approach to Mass Timber Design
(2023-12-08) Philion, Ethan Paul; Gales, John A.
As a new material, there is a significant lack of knowledge of the performance of mass timber, especially in fire. This research investigated the current understanding of modern mass timber, the performance of heritage mass timber, and the state of diversity of the industry itself. Findings include heritage hardwoods typically charred at a higher rate than the heritage softwoods but the species converged at a rate of 1.05 mm/min when exposed to 50 kW/m². Gender distributions of the survey (16% women, 81.7% men) mirrored industry statistics. It was also found that 71.4% of the women were ages 44 and under compared to 39.1% for men. The findings of this thesis can be used to further the design of mass timber structures and direct where future research for mass timber is needed most.
Open Access
Investigating Structural and Human Factors of Wildland-Urban Interface Fires
(2023-12-08) Carton, Hannah Li Er; Gales, John A.
Wildfires are increasing in number and severity due to multiple factors including climate change and increased interactions between people and the wildland. This thesis investigates structural and human factors of wildland-urban interface (WUI) fires with the goal of informing the design and creation of wildfire resilient communities. A review of building survival post-wildfires found that there are many structural and landscape factors that contribute to building survival, which are impacted by thevwildfire behaviour. There is a lack of post-wildfire data collection and data from diverse types of building performance in Canada. An ignition study of Eastern white cedar shingles found that increasing moisture content delays ignition. Video analysis of vehicular evacuations from the 2016 Fort McMurray Fire observed unusual traffic behaviour such as lane reversals, driving outside of marked lanes and bandwagon behaviour from other evacuees, which should be taken into account during evacuation planning.
Open Access
Influence of Climatic Factors on Water and Heat Transfer Within Subgrades
(2023-12-08) Modeste, Kerwin Glen; Park, Peter; Sharma, Jit
Open Access
Towards a Fire Safety Framework in Informal Settlements in Costa Rica
(2023-08-04) Guevara Arce, Sara Maria; Gales, John
This investigation develops a provisional understanding of fires in informal settlements in Costa Rica. This is achieved by analyzing previous fires and observing how the population behaved. One of the case studies is the El Pochote informal settlement fire, where it was possible to analyze the fire dynamics, the reaction of the inhabitants against the fire, how the first responders faced the fire and the working relationship between inhabitants and first responders. Then, a comparison between four informal settlements of different sizes will be performed in order to characterize their physical features and understand if the differences result in different behaviours of the population when facing fire events. The research includes a comparison on how Costa Rica and Canada manage their housing issues and analyzes what both countries can learn from each other. The thesis concludes with a test methodology for assessing materials that may be proposed in these settlements.
Open Access
Modelling of ECC and SMA-Reinforced Concrete Members
(2023-08-04) Martins-Robalino, Austin Marcelo; Palermo, Dan
Changes in codes which emphasize performance-based design have increased interest in the use of novel high-performance materials such as Shape Memory Alloys (SMAs) and Engineered Cementitious Composites (ECC). This work looks to model the response of ECC at both small-and large-scale sizes based on experimental data of ECC flexural prisms and shear walls reinforced with ECC. Modelling was conducted using VecTor2, a FEA modelling program widely applied in literature and industry. The applicability of built-in models for fibre-reinforced concrete (FRC), a concrete classification that includes ECC, was examined at a small scale. Lessons learned were applied in large scale modelling of hybrid SMA-steel slender shear walls in original condition and repaired with ECC. Results of small- and large-scale modelling demonstrated the need for further refinement of FRC models to better reflect ECC and allowed for a modelling methodology that provided more accurate load and ductility predictions in examined shear walls.
Open Access
Testing and Modelling of a Reinforced Concrete Shear Wall Subjected to Combined Lateral and Axial Loading
(2023-08-04) Paglia, Alessandro Serafino; Palermo, Dan
Higher axial loading requires higher lateral loads to displace the shear walls, however, during seismic events higher axial loads reduce the shear walls’ abilities to dissipate energy. During these seismic events, the hysteretic response of shear walls with axial loading exhibits a pinching effect. Not only does this signify reduced energy dissipation, but this pinching effect is also representative of lower residual drifts and higher stored elastic potential energy. The experimental and numerical testing of a large-scale RC slender shear wall was conducted herein to investigate these behavioural characteristics. The results from testing using combined axial loading and reverse cyclic lateral displacements demonstrated that higher axial loads increased the lateral load required to displace the wall, reduced the residual displacements, increased the amount of stored elastic potential energy during the loading cycles, and confined most of the damage within the bottom half of the wall. The numerical analysis and assessment of the wall required multiple changes and an investigation of various constitutive models to achieve a satisfactory simulation.
Open Access
Equivalent CO2 Emissions and Construction Costs of Buildings Designed Using Recycled Aggregate Concrete
(2023-08-04) Olcun, Sarp; Butler, Liam J.
Growing environmental concerns and lack of a sustained source of aggregate resources, have resulted in increased research dedicated to concrete produced with a variety of recycled and secondary materials. Despite the environmental benefits of recycled concrete aggregate (RCA), compared with conventional aggregates, the use of these materials often results in significantly lower mechanical properties of the resulting RCA concrete, requiring increases in cement content or structural dimensions in order to obtain similar strengths. In order to quantify and better understand environmental benefits of RCA concrete, a series of hypothetical case study structures were designed and analysed for equivalent CO2 emissions and costs during construction. In cases where higher quality RCA was available the reduction in eCO2 emissions was determined to be as high as 13.7%. Even with lower quality RCA, emission reductions of up to 8% were observed with certain alterations to structural design. It was concluded that when utilizing RCA concrete in new construction, the quality of the material available was the main factor in determining the degree of reduction in eCO2 emissions and the costs. Additional areas of further research were determined including more Lifecycle Assessment impact categories, RCA concrete structure assessment throughout service life, and analysis of additional building types.
Open Access
Performance of RC Columns Retrofitted with UHPFRC Jackets Under Cyclic Displacement Reversals
(2023-08-04) Tsiotsias, Konstantinos; Pantazopoulou, Stavroula
It is the purpose of this study to evaluate, through combined experimental and analytical research, the performance of reinforced concrete columns with or without prior damage, after retrofitting with ultra-high-performance fiber-reinforced concrete (UHPFRC) jackets and subjected to cyclic loading that simulates earthquake effects. A series of conventionally designed RC column elements were constructed, based on detailing methodologies of older code standards. Preliminary damage was imposed, simulating the effects of previous seismic excitation on the columns, and the plastic hinge zone was repaired through cover replacement with a thin commercial-grade UHPFRC jacket, as well as bond breakers placed on the starter bars of the lap-spliced connection. Through experimental testing, the behavior of the columns was studied under reversed lateral cyclic displacements with the objective to obtain quantified evidence of the performance of the retrofit methodology. The UHPFRC-retrofitted columns demonstrated substantial improvement in strength and ductility, over the pre-damaged columns, where the repaired and strengthened specimens showed similar failure modes and comparable responses. Detailed FEA simulations of the experimental program were conducted, where cyclic performance of the UHPFRC-retrofitted models was defined in accordance with the pertinent experimental data, and the broader distribution of reinforcement strains was validated. Companion small-scale material characterization experiments were prepared, to obtain the constitutive hysteretic properties of concrete confined with UHPFRC jackets, under axial monotonic and cyclic loading regimes, where the remarkable enhancement of the ductile response of the encased concrete was illustrated. Analytical models based on classical mechanics were applied, and the constitutive material laws were formulated, based on parameter calibration with the results collected from the experimental component. An extensive database on bond experiments from the literature was assembled, including specimens fabricated with UHPFRC and engineered cementitious composites (ECC). The database reveals the existing trend of discrepancy in the experimentally measured bond, dependent on specimen geometry. The results of a combined experimental study, containing direct tension pullout (DTP) and anchored four-point bending (AFPB) using UHPFRC-fabricated specimens confirm the passive contribution of curvature in bond strength, and parametric sensitivity FEA was conducted, where the spurious lateral effects occurring on the various bond test setups were captured.
Open Access
Safety and Operational Impact of Truck Platooning on Geometric Design Parameters
(2023-03-28) Chowdhury, Md Tanvir Uddin; Park, Peter Y.
The most well-known benefits of heavy commercial vehicle (HCV) platooning are fuel savings and emission reductions. HCV platooning under SAE automation level 4 or 5 would also address the truck driver shortage by eliminating the driver from one or more HCVs in a platoon. This dissertation investigates the safety and operational implications of SAE level 4 HCV platooning on North American roadways. The research develops modified analytical models and micro-simulation models (PTV VISSIM) for analyzing impacts on two-lane rural highways, urban arterial roadways, and freeways. The study considers different time headways (0.6 sec and 1.2 sec) between the platooning vehicles, and three market penetration rates (0%, 5%, and 10%). The two-lane rural highways chapter investigates the passing sight distance (PSD) required to overtake an HCV platoon. The urban arterial roadways chapter compares existing traffic controls with traffic signal priority (TSP) for HCV platoons. The freeways chapter investigates freeway acceleration lane length on merging segments for HCV platooning operations. The findings suggest that two-HCV platooning with 0.6 sec time headway and a 5% market penetration rate can be allowed on designated North American roadways. With proper passing lanes, two-HCV platoons can be operated on two-lane rural highways that already permit long combination vehicle operations. Even with TSP, HCV platooning on urban arterial roadways at penetration rates higher than 5% at our selected intersection may, however, cause significant delays and overwhelm the traffic system. On freeways, two-HCV platooning at a 5% market penetration rate where the freeway acceleration lane is at least 600m long appear to be feasible. The study will assist transportation professionals and policymakers in understanding the consequences of HCV platoons and deciding whether to allow HCV platooning on North American roadways.