Effect Of Internal Curing And Shrinkage-Mitigating Materials On Microstructural Characteristics Of Fiber-Reinforced Mortar, Kamran Aghaee, Kamal Khayat

Civil, Architectural and Environmental Engineering Faculty Research & Creative Works

Internal curing (IC) and other shrinkage mitigating materials are employed to reduce shrinkage and risk of cracking. This study investigates the efficiency of individual versus combined use of IC and shrinkage mitigating materials on key characteristics of fiber-reinforced mortar (FRM). The investigated mixtures include a 25% pre-saturated lightweight sand (LWS) that is added individually and combined with 10% CaO-based expansive agent (EA) and 2% shrinkage reducing admixture (SRA). This elucidates the synergistic effect of high content IC and EA/SRA on macro- and micro-mechanical characteristics of FRM, especially at the interface of the matrix with fibers. Mechanical properties, microstructural characteristics, and …

Prediction Of Compressive Strength And Evaluation Of Different Theoretical Standards And Proposed Models Of Brick Columns Confined With Frp, Frcm, Or Srg System, Zuhair Al-Jaberi, John J. Myers

Civil, Architectural and Environmental Engineering Faculty Research & Creative Works

The Strength Capacity of Confined Masonry Column is One of the Topics that Need to Be Studied. in This Study, the Efficiency of using Different Types of Advanced Composite (Non-Corrosive Materials) Such as Fiber Reinforced Polymer (FRP), Fiber Reinforced Cementitious Matrix (FRCM), or Steel Reinforced Grout (SRG) in Confining Masonry Columns is Investigated. a Wide Range of Experimental Database of Masonry Column Specimens Has Been Collected from the Results that Available in Scientific Literatures. Different Theoretical Standards and Proposed Models that Used to Predict the Capacity of Masonry Columns Confined with FRP and FRCM Are Evaluated based on Collected Experimental …

Rejuvenation Effect Of Aged Sbs-Modified Asphalt Utilizing Molecule Analysis, Ke Shi, Feng Ma, Jenny Liu, Zhen Fu, Ruimeng Song, Dongdong Yuan, Chen Li

Civil, Architectural and Environmental Engineering Faculty Research & Creative Works

The Performance of Styrene-Butadiene-Styrene Modified Asphalt (SBSMA) is Significantly Impacted by its Aging and Regeneration. in This Research, the Molecular Dynamics Simulation Was Utilized to Investigate the Rejuvenation Effect of Active Reagents on Aged SBS Modified Asphalt through the Following Tasks: 1) Verifying the Accuracy of the Asphalt Model by Density and Solubility Parameters; 2) Assessing the Changes in the Rejuvenated Asphalt Model's Energetic Parameters and Volume Parameters, 3) Studying the Interaction Energy between SBS Molecules and Asphalt Molecule Models, and 4) Evaluating the Relative Concentration, Interfacial Interaction Energy, and Diffusion Effect of the Asphalt-Asphalt Models. the Results Indicated that …

Field Implementation And Performance Of Fiber-Reinforced Low-Shrinkage Concrete For Bridge Deck Construction, Ahmed Abdelrazik, Kamal Khayat

Civil, Architectural and Environmental Engineering Faculty Research & Creative Works

This Paper Reports on the Field Implementation of Fiber-Reinforced Concrete (FRC) Used for Redecking the Two-Span overpass Bridge in Missouri. the Spans Measured 38.4 and 35.05 M in Length. Modeling of the Structural Behavior of the Bridge Replacement Deck Indicated Significantly High Tensile Stresses at Midspan (Up to 45 MPa) Due to the Continuity of the Deck over the Four Precast Main Girders. Redecking of the Bridge and Casting of the Central Diaphragm Were Carried Out Continuously and Necessitated 40 Concrete Truck Deliveries of 252 M3 of FRC. Six Sensor Towers Were Installed in the Bridge Deck to Monitor Variations …

Automated Detection And Characterization Of Cracks On Concrete Using Laser Scanning, Yunfeng Ge, Jenny Liu, Xiong Zhang, Huiming Tang, Xiaolong Xia

Civil, Architectural and Environmental Engineering Faculty Research & Creative Works

Accurate crack detection and characterization on concrete are essential for the maintenance, safety, and serviceability of various infrastructures. In this paper, an innovative approach was developed to automatically measure the cracks from 3D point clouds collected by a phase-shift terrestrial laser scanner (TLS) (FARO Focus3D S120). The approach integrates several techniques to characterize the cracks, which include the deviation on point normal determined using k-nearest neighbor (kNN) and principal components analysis (PCA) algorithms to identify the cracks, and principal axes and curve skeletons of cracks to determine the projected and real dimensions of cracks, respectively. The coordinate transformation was then …

Preliminary Bond Capacity Exploration Between Monolayer Graphene And Cementitious Composites, Yanping Zhu, Chuanrui Guo, Genda Chen

Civil, Architectural and Environmental Engineering Faculty Research & Creative Works

This Study Aims to Explore Bond Capacity between Monolayer Graphene and Cementitious Composites for the First Time through a Pullout Test. the Low-Pressure Chemical Vapor Deposition Method Was Used to Synthesize Monolayer Graphene on the Copper Substrate to Be Embedded in the Mortar Made by the Briquette Mold. the Bond Capacity between Them Was Higher Than the Tensile Strength of the Copper Sheet with As-Grown Monolayer Graphene on the Surface Since All Specimens Failed in Fracture with Embedment Length of More Than 30 Mm. the Monolayer Graphene Enhanced the Copper Tensile Fracture Stress and Normalized Energy during the Test as …

Assessment Of Design Standards For Fish Landing Centers In The City Of Aden, Abdulnasser Abdulla Alkaderi, Gawaher Khaled Fadhl

Emirates Journal for Engineering Research

ABSTRACT

The existence of fishing harbors became one of the factor that implies the performance of local fishermen. Since 2015, the fishing industry in Yemen has faced increased challenges, including a significant drop in the level of production; fish processing plants halting, and the disempowerment of the Ministry of Fish Wealth. Local fish landing centers and auction squares in the city of Aden suffer from a specific problem, which lies in their lack of many important services. Based on the problem, the study purposes to facilitate handling of fish products and provide comfortable environment for sellers, and consumers. Considering the …

Using Bim To Increase The Efficiency Of Energy-Driven Retrofitting Projects, Anne Grego, Shannon Chance, Barry Mcauley

Conference Papers

The building sector is responsible for nearly 40% of global energy consumption. Many existing buildings have poor thermal insulation and low energy performance, hindering sustainability goals. Energy-driven building retrofitting could address this issue and implementing Building Information Modelling (BIM) in retrofitting can reduce process time, costs, and waste associated with such undertakings. Yet, there is a lack of research and insufficient guidance for implementing BIM in energy-driven retrofitting. A BIM framework is presented to enhance decision-making processes during retrofitting. The aims of this study were to (1) identify BIM technologies and methodologies that could address existing barriers and improve efficiency …

معايير تقييم محطات النقل التبادلية بالتطبيق على محطة الجيزة التبادلية بالقاهرة الكبرى, Rania Adham, Abeer Galal, Maha Abd El Sattar

Emirates Journal for Engineering Research

يعتبر الاهتمام بترابط وكفاءة وسائل النقل العام في كل من البلدان المتقدمة والنامية من الأولويات الاستراتيجية من أجل تحقيق تنقل سلس وفعال، خاصة في المدن كثيفة التحضر والأنشطة، حيث يكون استخدام وسائل النقل المختلفة سمة أساسية في الحياة اليومية للناس. ويواجه انشاء محطات نقل الركاب بمختلف أنماطها عدة تحديات أهمها تحقيق هدف التنقل الامن للركاب بالتوافق مع معايير الاستدامة العمرانية والاقتصادية والاجتماعية والبيئية. يركز البحث على دراسة محطات نقل الركاب التبادلية وذلك من خلال استخلاص معايير لتقييم تلك المحطات من الدراسات النظرية والتجارب العالمية، ثم تطبيق تلك المعايير لتقييم إحدى المحطات التبادلية في إقليم القاهرة الكبرى. وينتهي البحث باستخلاص نتائج …

Subterraneans: A Regional Earth Dwelling For Comfort And Beauty, Isaak Benchoff

Architecture Undergraduate Honors Theses

Subterraneans is a study of an affordable, self-sufficient, sustainable, and dignified housing prototype for the region of Northwest Arkansas. It is a design process investigation based on the ideas of turning a local, sustainable material into affordable homes that can be built within a community of people sharing land and resources. The homes would utilize as many natural materials as possible to minimize the impact on the Earth and the cost to the owners.

Research looked at many different vernacular building precedents as well as the work done by contemporary design firms in the area of economical, low-impact, and passively …

Predicting The Friction Coefficient Of High-Friction Surface Treatment Application Aggregates Using The Aggregates' Characteristics, Ahmed S. El-Ashwah, Korrenn Broaddus, Magdy Abdelrahman

Civil, Architectural and Environmental Engineering Faculty Research & Creative Works

Providing Sufficient Pavement Surface Friction (I.e., Skid Resistance) between Vehicle Tires and Pavement Surface throughout the Pavement Service Life is Considered to Be One of the Main Objectives of Highway Design. Moreover, Vehicle Safety, the Amount of Consumed Fuel, and the Wearing Rate of Vehicle Tires Generally Are Influenced by Pavement Surface Friction. in This Study, a Comprehensive Experimental Testing Program Was Conducted on Different Aggregate Sources, Including Calcined Bauxite and Five Alternative Local Sources, to Assess their Friction Characteristics. the Testing Program Included a British Pendulum Tester (BPT) and a Dynamic Friction Tester (DFT), Which Were Used to Evaluate …

The Way Of Water: A Cultural Revival, Mariana Munoz

Architecture Senior Theses

THE WAY OF WATER: A CULTURAL REVIVAL MARIANA MUNOZ:

This thesis aims to address the challenges facing the coastal community of Condado, Puerto Rico, by proposing interventions that protect against floods and restore access to water, while also enhancing daily life and cultural practices. Through an examination of the community’s existing conditions, and answer three research questions: (1) how to mitigate flooding without displacing the community, (2) how to meet the needs of the community during times of emergency, and (3) how to integrate interventions into daily life and existing practices. The proposed interventions include a canal system to redirect …

Remote Alignment Fixing Device With Vizir Marks In Base Lcd Indicator, Nodirbek Rustambekovich Yusupbekov, Zahidov Muratovich Nematjon

Chemical Technology, Control and Management

The article substantiates the needs to increase the level of automation of methods and geodetic support of geometric parameters during the construction of buildings and structures. In particular, the method of alignment measurements is considered. This is widely used in determining deviations from the straightness and alignment of the installation of elements in engineering building structures, including hydraulic structures, as well as in the control of process equipment installations, rolling mills, conveyor lines, crane tracks, when monitoring precipitation. and deformations of techno objects. One of the methods of alignment measurements with the use of a visual-optical device – aliniometer and …

Law School News: Joyce And Bill Cummings Of Cummings Foundation To Deliver Keynote Address At Rwu Commencement 4-20-2023, Jill Rodrigues

Life of the Law School (1993- )

No abstract provided.

Discrete-Element Modeling Of Shear-Induced Particle Migration During Concrete Pipe Flow: Effect Of Size Distribution And Concentration Of Aggregate On Formation Of Lubrication Layer, Tooran Tavangar, Masoud Hosseinpoor, Jeffrey S. Marshall, Ammar Yahia, Kamal Khayat

Civil, Architectural and Environmental Engineering Faculty Research & Creative Works

The Paper Seeks to Better Understand the Particulate Mechanics Giving Rise to the Lubrication Layer (LL) in Flows with Wide Particle-Size Distributions (PSD) Typical of Concrete Pumping Applications. the Study Uses a Soft-Sphere Discrete Element Method (DEM) to Simulate the Shear-Induced Particle Migration (SIPM) Mechanism of Formation of the LL. to Provide Realistic Understanding of SIPM and Rheological Heterogeneity of Concrete, Three Wide PSDs (Fine, Medium, and Coarse) and Three Different Concentrations (10 %–40 %) of Five Spherical-Particle Subclasses (1–17 Mm Diameter) Were Investigated. the Radial Evolution of Concentration and Particle Distribution Was Simulated over Time and the LL Formation …

Performance Assessment Of Bioasphalt Mixtures Containing Guayule Resin As An Innovative Biobased Asphalt Alternative, Ahmed Hemida, Magdy Abdelrahman

Civil, Architectural and Environmental Engineering Faculty Research & Creative Works

Guayule resin was investigated through mixture to assess its role in the field performance. For performance comparisons, conventional asphalt, neat guayule, asphalt-rubber-guayule, and guayule-rubber binders were implied. Field-simulated lab mixtures were made to investigate the major distresses. Modified Lottman, rut, semicircular bending, and disk-shaped compact tension tests were used to assess stripping, rutting, fatigue, and thermal cracking resistances. Stripping and rutting susceptibilities were also assessed by Hamburg wheel-tracking test. The outcomes disclosed that when the modified Lottman test was used, guayule containing a 7% air content was more susceptible to stripping than that containing a 3.5% air content, resulting in …

Analysis Of Eccentrically Loaded Frp Partially Wrapped Reinforced Concrete Columns Subjected To Combined Environmental Erosion, Zhiqiang Gu, Congjie Wei, Chenglin Wu, Danying Gao, Peibo You, Dong Wei

Civil, Architectural and Environmental Engineering Faculty Research & Creative Works

The Behavior of Eccentrically Loaded Fiber Reinforced Polymer (FRP) Partially Wrapped Reinforced Concrete (RC) Columns under Combined Environmental Erosion Was Investigated in This Paper. Circular RC Columns Were Firstly Subjected to Chloride Erosion Where the Target Corrosion Degree (0, 10 %, and 20 %) is Obtained with Externally Applied Current. This Was Then Followed by Partially Strengthening with 2-Ply of Glass Fiber Reinforced Polymer (GFRP) Strips as Well as 50 Freeze–thaw Cycles. Series of Eccentric Compression Tests Were Conducted with Ranging Eccentricities of 0, 5 Mm, 10 Mm, and 15 Mm. for Comparison, the Carbon Fiber Reinforced Polymer (CFRP) Partially …

Efficient Recycling Of Waste Rubber In A Sustainable Fiber-Reinforced Mortar And Its Damping And Energy Dissipation Capacity, Haodao Li, Wu Jian Long, Kamal Khayat

Civil, Architectural and Environmental Engineering Faculty Research & Creative Works

A Great Number of Waste Tires Are Discarded in Landfills, Occupying Land Resources, and Severely Endangering the Ecosystem. Upcycling These Wastes as Aggregates to Partially Substitute Natural Sand and Develop Structure-Function Integration in Concrete Structures is a Desirable Solution. in This Study, a Sustainable Fiber-Reinforced Rubberized Mortar with Superior Material Damping and Moderate Strength is Developed by Combined Use of Waste Crumb Rubber (WCR) Incorporated at 0, 30%, and 60%, by Volume of Sand, and Polyvinyl Alcohol (PVA) Fiber Added at 0, 0.5%, and 1%, by Volume, in a High-Volume Fly Ash Binder System. Low-Temperature Plasma (LTP) Pre-Treatment of the …

Investigation Of Corrosion Mechanism Of Ribbed Mild Steel Bars Coated With Magnesium Potassium Phosphate Cement Paste, Fan Zhang, John J. Myers, Wenyu Liao, Cun Hui, Hongyan Ma

Civil, Architectural and Environmental Engineering Faculty Research & Creative Works

This Study Investigated the Anti-Corrosion Performance of Magnesium Potassium Phosphate Cement (MKPC) Paste Applied to the Surface of Ribbed Mild Steel Bars – Which Was Exposed to Simulated Accelerated Corrosive Environment. Four Electrochemical Approaches Were Used Including Open-Circuit Potential (OCP), Electrochemical Impedance Spectroscope (EIS), Polarization Resistance (PR) and Potentiodynamic Polarization (PDP) over a Period of 5376 H (224 Days). Moreover, Visual Inspection, Optical Microscope, and Scanning Electron Microscopy (SEM) with Energy Dispersive Spectroscopy (EDS) Were Used to Assess the Extent of Corrosion on the Samples. to Understand the Mechanism of Corrosion Protection of the Coating System, X-Ray Photoelectron Spectroscopy (XPS) …

Biomimicry As An Urban Challenge In Shaping The Future Of Cultural Communities, Nora M. Rehan

Architecture and Planning Journal (APJ)

The cultural identity of urban communities is the main expression of historical privacy and shapes societies’ past, present, and future. It is an entity of cultural and knowledge accumulation stemming from the community's traditions and customs, which help to consolidate the social fabric and play an important role in the lives of individuals and the planning and development processes. Urban areas with cultural and heritage values are the most important competitive advantages of urban cities that are considered as a primary nucleus for achieving sustainability on a broader scale for the neighboring regions. One of the most important of those …