Architectural Engineering Commons^™

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 …

Characterizing Energy Dissipation Of Shallow-Water Wave Breaking In A Storm Surge, Hunter Boswell, Guirong Grace Yan, Wouter Mostert

Civil, Architectural and Environmental Engineering Faculty Research & Creative Works

While understanding breaking waves is crucial for the development of parametrizations used in ocean wave modeling for both deep and shallow water, the complete process of wave breaking is not well understood. Here we present direct numerical simulations of two-dimensional solitary waves that shoal and break on a uniform beach in shallow water, with the presence of storm surge represented by an inshore region. The storm surge depth, beach slope, and wave amplitude are varied to study the dependence of energy dissipation in the breaker on wave and bathymetric parameters. We classify wave breaker types and find a separation between …

The Bridge Newsletter Spring 2023, Missouri University Of Science And Technology

The Bridge Newsletter

-Virtual reality in architectural engineering
-Steel Bridge team wins fifth consecutive competition
-S&T Volleyball star ‘jumps’ at research opportunity
-Benavides legacy continues

Calibration Of Bbm Parameters Using The Modified State Surface Approach, Xiong Zhang, Beshoy Riad, Eduardo E. Alonso

Civil, Architectural and Environmental Engineering Faculty Research & Creative Works

The Barcelona Basic Model (BBM) developed by Alonso et al. [1] is the first and the mostwidely used elasto-plastic model for unsaturated soils. The BBM successfully explained many key features of unsaturated soils and received extensive acceptance. However, there is lack of a well-establishedmethod for selecting parameter values for the BBM from laboratory tests, although a variety of methods have been recently developed for calibrating model parameters for the BBM. Concerns still exist on the correctness and robustness of such parameter value selection procedures. The above statements were evidenced by a recent benchmark exercise on selection of parameter values for …

A Unified Two Independent Stress Variable Approach To Moisture-Change-Induced Unsaturated Soil Volume Change, Sandra Houston, Xiong Zhang

Civil, Architectural and Environmental Engineering Faculty Research & Creative Works

In 1968, Matyas and Radhakrishna introduced the concept of the state surface, demonstrating that unsaturated soil volume change is dependent on two independent stress state variables, net total stress and suction. For decades the basic theory of unsaturated soils has been known, and a holistic view of the elastoplastic response of unsaturated soils, based on a modified state surface approach (MSSA), makes it clear that a method accounting for independent roles of net total stress and suction is required to quantify volume change of unsaturated soils. Still, reliance on pre-unsaturated-soil-mechanics-era methods persists, particularly within the geotechnical practice community. Unsaturated soil …

Lunar In-Situ Aluminum Production Through Molten Salt Electrolysis (Lisap-Mse), Jacob Ortega, Jeffrey D. Smith, Fateme Rezaei, David Bayless, William P. Schonberg, Daniel S. Stutts, Daoru Frank Han

NASA-Missouri Space Grant Consortium

The goal of Artemis is to establish a sustained presence on the Moon. To achieve so, numerous resources are necessary. The Moon contains several essential elements needed to sustain human presence. Most of those elements are trapped in the form of minerals. To refine those minerals into useful materials, reduction methods are needed. Most reduction methods on Earth require large amounts of mass and power which is unrealistic for early stages of building a lunar base. To solve this problem, we are developing a concept of Lunar In-Situ Aluminum Production through Molten Salt Electrolysis (LISAP-MSE).

The LISAP-MSE project, if successful, …

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 …

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 …

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 …

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) …

Raveling Performance Of Conventional And Rubberized Chip Seal Under Field And Laboratory Traffic Loading, Alireza Pourhassan, Ahmed A. Gheni, Mohamed Elgawady

Civil, Architectural and Environmental Engineering Faculty Research & Creative Works

Raveling, or the Loss of Surface Aggregate, is a Major Concern in Chip Seal Pavement. Previous Studies Have Used the Standard Sweep, Vialit, and Pennsylvania Tests to Evaluate Raveling, But These Tests Do Not Replicate the Stresses of Rolling Vehicle Tires on Chip Seal and Have Produced Inconsistent Results. Additionally, These Tests Mainly Evaluate Early-Stage Raveling Due to their Short Curing Time. in This Study, a Small-Wheel Traffic Simulation Device (SWTS) Was Used to Apply Similar Stresses as Rolling Vehicle Tires and Produce Comparable Raveling Results. This Was Confirmed through a 13-Month Field Observation of Chip Seal, Where the Laboratory …

Hyperspectral Reflectance For Determination Of Steel Rebar Corrosion And Cl− Concentration, Pengfei Ma, Liang Fan, Genda Chen

Civil, Architectural and Environmental Engineering Faculty Research & Creative Works

In This Study, a New Method is Proposed to Determine Chloride Ion (Cl−) Concentration and Steel Rebar Corrosion from Hyperspectral Spectroscopy. Three Groups of Mortar Cubes with Water-To-Cement (W/c) Ratios of 0.5, 0.6, and 0.7 Were Subjected to Rapid Corrosion Testing in 3.5 Wt% NaCl Solution to Accelerate the Transport of Chloride Ions. Embedded Along the Centerline of Each Mortar Cube Was a Steel Rebar that Corroded When the Cl− Accumulation Around It Exceeded a Critical/threshold Concentration. Open Circuit Potential Was Measured to Characterize the Corrosion Possibility of Steel Rebar. Mortar Surfaces Were Scanned with a Hyperspectral Camera in the …

Wind Effects On Dome Structures And Evaluation Of Cfd Simulations Through Wind Tunnel Testing, Tiantian Li, Hongya Qu, Yi Zhao, Ryan Honerkamp, Guirong Grace Yan, Arindam Chowdhury, Ioannis Zisis

Civil, Architectural and Environmental Engineering Faculty Research & Creative Works

In the Study, a Series of Wind Tunnel Tests Were Conducted to Investigate Wind Effects Acting on Dome Structures (1/60 Scale) Induced by Straight-Line Winds at a Reynolds Number in the Order of 106. Computational Fluid Dynamics (CFD) Simulations Were Performed as Well, Including a Large Eddy Simulation (LES) and Reynolds-Averaged Navier–Stokes (RANS) Simulation, and their Performances Were Validated by a Comparison with the Wind Tunnel Testing Data. It is Concluded that Wind Loads Generally Increase with Upstream Wind Velocities, and They Are Reduced over Suburban Terrain Due to Ground Friction. the Maximum Positive Pressure Normally Occurs Near the Base …

Enhancement Of Heat-Cured Cement Paste With Tannic Acid, Jinrui Zhang, Ziye Kang, Youzhi Yang, Biqin Dong, Hongyan Ma

Civil, Architectural and Environmental Engineering Faculty Research & Creative Works

The Improvement of Cement-Based Materials' Performance by Natural Organic Compounds Can Greatly Promote the Green and Sustainable Development of the Construction Industry. However, Such Compounds Are Not Widely Used Yet Because of their Retarding Effect on Cement. in This Study, the Retardation Effect of Tannic Acid (TA, a Well-Known Retarding Compound) is overcome and the Enhancing Effect is Achieved by Adding Less Than 0.1% Content and Curing Samples in Thermal Regime. Then the Mechanism of TA Enhancing Heat-Cured Cement Pastes is Studied Systematically. Mechanical Properties Results Suggest that Addition of 0.025% TA Can Reduce the Compressive and Flexural Strengths of …

Synergistic Effect Of Hedp.4na And Different Induced Pouring Angles On Mechanical Properties Of Fiber-Reinforced Alkali-Activated Slag Composites, Jingjie Wei, Jianwei Liu, Kamal Khayat, Wu Jian Long

Civil, Architectural and Environmental Engineering Faculty Research & Creative Works

The Poor Flexural and Damping Properties of Building Materials Damages Concrete Structures and Affects their Service Life When Concrete Structures Are Subjected to Dynamic Loads. Three Different Dosages (I.e., 0%, 0.3%, and 0.6%) of Organic Phosphonates (HEDP.4Na) and Different Pouring Methods (I.e., Conventional Pouring Method, 90°-Induced Pouring Method, and 150°-Induced Pouring Method) Were Designed to Improve the Flexural and Damping Performance of Fiber-Reinforced Alkali-Activated Slag Composites (FR-AASC). the Enhanced Mechanism of HEDP.4Na Was Revealed by Phase Analysis (X-Ray Diffraction, XRD), Pore Structure Analysis (Mercury Intrusion Porosimetry, MIP), the Heat of Hydration, and Scanning Electron Microscopy (SEM) Analysis. the Results Showed …

Integrating Quality Assurance In Balance Mix Designs For Durable Asphalt Mixtures: State-Of-The-Art Literature Review, Yizhuang David Wang, Jun Liu, Jenny Liu

Civil, Architectural and Environmental Engineering Faculty Research & Creative Works

Delivering durable asphalt concrete within a reasonable cost is one of the great ambitions of pavement material engineers. This state-of-the-art review article documents the efforts spent in the past two decades to ensure the durability and performance of asphalt mixtures in mix design and production. A perspective with the attempt to integrate laboratory mix design, plant production quality assurance, and field place acceptance is applied in the review. The development of the performance specification and performance mix design is summarized. The paper categorizes performance specification into index-based performance specification and predictive performance specification that include performance-related specification and performance-based specification. …

Rheological Characterization Of Ultra-High Performance Concrete For 3d Printing, Arun R. Arunothayan, Behzad Nematollahi, Kamal Khayat, Akilesh Ramesh, Jay G. Sanjayan

Civil, Architectural and Environmental Engineering Faculty Research & Creative Works

The authors recently developed a 3D-printable ultra-high performance fiber-reinforced concrete (3DP-UHPFRC) for additive construction of structural members with significantly reduced reliance on steel bars. This study investigates the rheological behavior of the developed 3DP-UHPFRC. The effects of two major factors affecting the performance of 3DP-UHPFRC, namely steel fiber volume (0, 1%, and 2%) and nano-clay (NC) content (0, 0.1%, and 0.2% by binder mass) on workability, static yield stress, dynamic yield stress, and apparent viscosity were determined. Test results showed that the inclusion of steel fibers and NC reduced the workability and led to a significant increase in the static …

Homogeneous Flow Performance Of Steel-Fiber Reinforced Self-Consolidating Concrete For Repair Application: A Biphasic Approach, Naimeh Nouri, Masoud Hosseinpoor, Ammar Yahia, Kamal Khayat

Civil, Architectural and Environmental Engineering Faculty Research & Creative Works

In this study, fiber-reinforced self-consolidating concrete (FR-SCC) was considered as a diphasic suspension of fiber and coarse aggregate (F-A ≥ 5 mm) skeleton in mortar suspension with solid particles finer than 5 mm. The coupled effect of the volumetric content of fibers, coarse aggregate particle-size distribution, and rheological properties of the mortar on the passing ability and dynamic stability of various FR-SCC mixtures was investigated. Nine high-strength and 10 conventional-strength FR-SCC mixtures for repair application were proportioned with water-to-binder ratios (W/B) of 0.35 and 0.42, respectively, and macro steel fibers of 0.1%–0.5% volumetric contents. The dosages of high-range water-reducer (HRWR) …

Effect Of Class C And Class F Fly Ash On Early-Age And Mature-Age Properties Of Calcium Sulfoaluminate Cement Paste, Sukanta K. Mondal, Carrie Clinton, Hongyan Ma, Aditya Kumar, Monday Uchenna Okoronkwo

Civil, Architectural and Environmental Engineering Faculty Research & Creative Works

To Promote the Sustainable Development of Eco-Efficient Calcium Sulfoaluminate (CSA) Cements through the Partial Replacement of the CSA Clinker with Supplementary Cementitious Waste Products, the Effects of Coal Fly Ashes on the Early-Age and Mature-Age Properties of a Calcium Sulfoaluminate (CSA)-Based Cement Paste Were Investigated. the Impacts of Both Class C and Class F Fly Ashes on the Rheological Properties, Hydration Kinetics, and Compressive Strength Development of CSA Cement Paste Were Studied. Rheology-Based Workability Parameters, Representing the Rate of Loss of Flowability, the Rate of Hardening, and the Placement Limit, Were Characterized for the Pastes Prepared with Fixed Water-To-Cement (W/c) …

Effect Of Additional Water Or Superplasticizer On Key Characteristics Of Cement Paste Made With Superabsorbent Polymer And Other Shrinkage Mitigating Materials, Kamran Aghaee, Ricarda Sposito, Karl Christian Thienel, Kamal Khayat

Civil, Architectural and Environmental Engineering Faculty Research & Creative Works

The use of superabsorbent polymer (SAP) coupled with expansive agent (EA) or shrinkage-reducing admixture (SRA) can effectively reduce shrinkage of cement-based materials. However, SAP particles at high contents can adversely affect rheological and mechanical properties. Securing proper workability can be accomplished by additional water or adjusting the superplasticizer (SP) demand. There is an uncertainty about the efficiency of these approaches to workability compensation. This study evaluates the effect of additional water or SP on key properties of cement paste made with SAP and relatively high content of EA or SRA. Macro and micro mechanisms underlying the effect of combined shrinkage …

Prediction Of Dynamic Mechanical Behaviors Of Coral Concrete Under Different Corrosive Environments And Its Enhancement Mechanism, Jingjie Wei, Boyuan Cheng, Lixiao Li, Wu Jian Long, Kamal Khayat

Civil, Architectural and Environmental Engineering Faculty Research & Creative Works

The marine structures are usually exposed to dynamic loadings within short periods and chemical attacks, resulting in severe dynamical damage or failure to concrete structures. The study of the time-dependent changes in the dynamic mechanical behavior of coral concrete under different corrosive environments and low-frequency waves is limited. For the safety and reliable use of coral concrete in the marine environment, different corrosion environments (chloride ions, sulfate ions, and mixed chloride-sulfate ions) and low-frequency waves (0.5–2.0 Hz) were designed to evaluate the dynamic properties of concrete. A model considering the effect of corroded age is formulated to predict the damping …

Key Factors Affecting Labor Productivity In Offsite Construction Projects, Rayan H. Assaad, Islam H. El-Adaway, Makarand Hastak, Kim Lascola Needy

Civil, Architectural and Environmental Engineering Faculty Research & Creative Works

Offsite construction has been shown to possess many advantages and benefits in dealing with the construction industry's challenges, which include poor labor productivity. Nevertheless, all previous productivity-related research studies have focused mainly on factors impacting labor productivity in traditional stick-built construction methods. This paper filled this knowledge gap by following a multistep interrelated research methodology. First, a research team of 19 construction professionals and academics developed and distributed an industry survey to (1) quantify the likelihood of occurrence and relative impact of risk factors that adversely impact labor productivity in offsite construction projects; (2) identify and prioritize key risk factors …

Assessing The Predictive Capability Of The Nno Ballistic Limit Equation For Low-Density Projectile Impact, William P. Schonberg

Civil, Architectural and Environmental Engineering Faculty Research & Creative Works

The design of nearly all Earth-orbiting spacecraft includes some sort of added shielding that protects the spacecraft against impacts by meteoroids and orbital debris. The effectiveness of the shielding is typically assessed using ballistic limit equations (BLEs) that are developed using data from high-speed impact tests on key spacecraft components and elements. These equations predict whether or not a particular system or structural element will sustain a critical failure following a specific impact event. As such, they are essential components of spacecraft system design as well as any quantitative spacecraft risk assessments that may need to be performed as part …

Measurement Of Volumetric Deformation, Strain Localization, And Shear Band Characterization During Triaxial Testing Using A Photogrammetry-Based Method, Sara Fayek, Xiong Zhang, Xiaolong Xia, Qingqing Fu, Jeffrey D. Cawlfield

Civil, Architectural and Environmental Engineering Faculty Research & Creative Works

Triaxial Testing Has Been Routinely Used as a Standard Laboratory Test that Allows Correct Determination of Soil Characteristics. Previously the Volumetric Strain of the Triaxial Specimen Was Considered to Be Uniformly Distributed Along with the Specimen during the Isotropic and Deviatoric Loading. Although This Assumption Might Hold True under Isotropic Loading, the Effects of Restrained Ends and Disturbance during the Procedures of Specimen Installation and Testing Can Cause Nonuniform Strains throughout the Whole Specimen. This Paper Investigates the Effects of Specimen Preparation and Misalignment on the Strain Uniformity Along with the Soil Specimen during Triaxial Testing. a Series of Consolidated …

Editorial: Ultra-High Performance Concrete: Computation And Simulation Methods, Xinpeng Wang, Yitong Ma, Dongshuai Hou, Hongyan Ma, Yue Zhang

Civil, Architectural and Environmental Engineering Faculty Research & Creative Works

No abstract provided.

Field Reconnaissance And Observations From The February 6, 2023, Turkey Earthquake Sequence, Gulen Ozkula, Robert K. Dowell, Tugce Baser, Jui Liang Lin, Ozgun A. Numanoglu, Okan Ilhan, C. Guney Olgun, Cheng Wei Huang, Tunc Deniz Uludag

Civil, Architectural and Environmental Engineering Faculty Research & Creative Works

On February 6, 2023, a sequence of earthquakes hit Kahraman Maras, Turkey, with magnitudes of M w = 7.8 and 7.5, at 4:17 am and 1:24 pm local time, respectively. According to the records, the M w = 7.8 event was the biggest earthquake since the 1939 Erzincan earthquake of the same magnitude and second-strongest recorded after the 1668 North Anatolia Earthquake. However, it was the most devastating earthquake in the history of Turkey in terms of structural and geotechnical damage and fatalities caused by this. The objective of this article is to explore the aftermath of this major seismic …

Point Density For Soil Specimen Volume Measurements In Image-Based Methods During Triaxial Testing, Sara Fayek, Xiong Zhang, Javad Galinmoghadam, Jeffrey D. Cawlfield

Civil, Architectural and Environmental Engineering Faculty Research & Creative Works

Discrete Measurement Targets Were Frequently Utilized in Image-Based Methods on the Specimen's Surface to Monitor the Soil Specimen during Triaxial Testing. However, the Required Density of Measurement Targets that Should Be Used in Triaxial Testing to Achieve Highly Accurate Volume Measurement Has Not Been Investigated. to overcome This Limitation, This Paper Presents a Parametric Study to Determine the Optimum Target/point Densities to Be Utilized on the Triaxial Soil Specimen Surface to Achieve the Desired Level of Volume Measurement Accuracy in Image-Based Methods. LiDAR Scanning Was Applied to Establish the "Ground Truth" Volume of the Specimen. the Effects of Deformation and …

Efficient And Accurate Coded Target Decoding For 3d Reconstruction Of Soil Specimens In Triaxial Test, Xiaolong Xia, Xiong Zhang

Civil, Architectural and Environmental Engineering Faculty Research & Creative Works

Coded Targets Have Been Widely Used for Solving the Corresponding Problem in Photogrammetry for High-Accuracy Three-Dimensional Measurements. Accurate and Efficient Recognition and Identification of Coded Targets Are of Great Importance in Coded Target-Based Photogrammetry. in This Paper, an Efficient and Accurate Method for Coded Target Decoding Was Developed. in This Method, Blob Analysis Was Performed to Recognize the Coded Targets. Then, Image Processing, the RANSAC Algorithm, and the Interpolation Technique Were Applied Respectively to Decode the Coded Targets, Identify Falsely Identified Coded Targets, and Recover Missing Coded Targets. Interpolation Was Also Performed on the Membrane, Which Can Significantly Increase the …

Internal Structure And Breakage Behavior Of Biogenic Carbonate Sand Grains, Elieh Mohtashami, C. Guney Olgun, Chenglin Wu, Tara Selly

Civil, Architectural and Environmental Engineering Faculty Research & Creative Works

This Study Investigates the Mechanical Behavior of Biogenic Carbonate Sands from Puerto Rico at Grain-Scale Level. Micro-Computed Tomography Has Also Been Used to Get Insights on the Internal Structure of These Particles Before and after Loading. the Crushing Strength of These Particles Are Smaller Comparing to the Values Reported for Silica Sands. It Has Also Been Shown that These Particles Have Complex Internal Structure Including a Network of Pores Connected with Channels. This Study Also Demonstrates the Effect of Intragrain Structure of Biogenic Carbonate Sands and Shows How Internal Grain Structure Plays a Role on Particle Fracture.