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Articles 661 - 677 of 677
Full-Text Articles in Civil Engineering
Discharge Headway At Signalized Intersections In Monterrey, Nuevo Leon, Mexico, Luis F. Chapa
Discharge Headway At Signalized Intersections In Monterrey, Nuevo Leon, Mexico, Luis F. Chapa
Civil Engineering Dissertations - Archive
Driver behavior has been the subject of study for almost 100 years. As a result, driver characteristics have been determined and used in the design of highway elements, both for interrupted and for free flow facilities. Signalized intersections represent the most typical interrupted flow facility, with driver reaction time and aggressiveness playing a key role in signal timing design and also in the assessing of intersection performance. These driver characteristics were first determined in the United States in the late 1940's, identifying an average headway (in seconds) between consecutive vehicles as they react to light change from red to green …
Comparison Of Clinoptilolite With Gravel In A Recirculating Course Media Biofilter Treating Simulated Septic Tank Effluent, Adnan Sadikot
Comparison Of Clinoptilolite With Gravel In A Recirculating Course Media Biofilter Treating Simulated Septic Tank Effluent, Adnan Sadikot
Civil Engineering Theses - Archive
The main objective of the pilot scale study was to compare the performance of recirulating clinoptilolite biofilter with course gravel biofilter used to treat simulated septic tank effluent by simultaneous nitrification and denitrification. For better comparison of performance of total inorganic nitrogen removal and COD removal both the biofilter were chosen of identical size and identical operating conditions were maintained in the laboratory setup. Both the biofilters were operated at recycle ratio of 6 and surface hydraulic loading rate of 7.5 gal/ft2/day without recycle and 52.5 gal/ft2/day with recycle through out the duration of the duration of the research. Results …
Effects Of Water-Cement Ratio On Deep Mixing Treated Expansive Clay Characteristics, Siva Prasad Pathivada
Effects Of Water-Cement Ratio On Deep Mixing Treated Expansive Clay Characteristics, Siva Prasad Pathivada
Civil Engineering Theses - Archive
The structures built on the unstabilized expansive soils are subjected to distress due to swell shrink behavior due to seasonal fluctuations. Medium stiff expansive clays with moderate and high PI were collected from two sites located at IH 820 N bound in Fort Worth, Texas. Deep soil mixing technique was proposed as a potential solution to counter the shrink swell movements of the expansive soil. These soils were stabilized using lime and cement as a whole and in combinations at different proportions in laboratory conditions simulating field deep soil mixing. Similar studies performed on soft soils revealed several factors mainly …
Numerical Modeling And Analysis Of Pile Supported Embankments, Krishna Nag Rao
Numerical Modeling And Analysis Of Pile Supported Embankments, Krishna Nag Rao
Civil Engineering Theses - Archive
Very soft clays are often avoided in construction due to their low shear strength and high compressibility. Special construction methods are adopted when embankments are constructed on very soft clay or peat. Design of structures on soft ground, where the structure impose large loads onto the ground raises several concerns on factors like bearing capacity failure, differential settlements, lateral pressures and structural instability. Shallow and deep stabilization of soft ground are most frequently used special construction techniques adopted in geotechnical engineering. Chemical (lime and cement) stabilization has been extensively used in both shallow and deep stabilization in order to improve …
Laboratory And Field Investigations To Address Erosion, Volume Change And Desiccation Cracking Of Compost Amended Expansive Subsoils, Napat Intharasombat
Laboratory And Field Investigations To Address Erosion, Volume Change And Desiccation Cracking Of Compost Amended Expansive Subsoils, Napat Intharasombat
Civil Engineering Dissertations - Archive
Desiccations cracks are formed during drying process of fine grained cohesive soils in summer and these cracks often appear on unpaved subgrades due to direct exposure to sun. These cracks allow surface runoff infiltration into subsoils and eventually weaken adjacent base and subgrade layers. The loss of support from these underlying layers results in both longitudinal and transverse cracks in paved shoulders and pavements. Composting is a successful method of recycling organic waste material into stabilized materials that could be used for erosion control and landscaping applications. Since compost is rich in fibrous material and exhibits moisture affinity characteristics, it …
Removal Of Carbonyl Sulfide Using Compost Biofilter: Measurement Of Removal Rates And Elimination Capacity In Conjunction With Hydrogen Sulfide, Divya R. Garrepalli
Removal Of Carbonyl Sulfide Using Compost Biofilter: Measurement Of Removal Rates And Elimination Capacity In Conjunction With Hydrogen Sulfide, Divya R. Garrepalli
Civil Engineering Theses - Archive
A lab study using biofiltration was conducted using three PVC columns as biofilters, with hardwood chips and compost as the media. Previous research determined the removal efficiency of carbonyl sulfide alone. (Nawal, 2004) Typically, however H2S is present with COS in the air streams from wastewater treatment plant units. In the current study, different combinations of hydrogen sulfide and carbonyl sulfide gases were tested using H2S/COS ratios typical of the concentrations from wastewater treatment plants. Various runs were conducted using compost and hardwood chips individually and also with an 80:20 ratio by volume of wood chips to compost. The specific …
Comparison Of Adsorption Capacities Of Nanoadsorbents With Conventional Activated Carbon For Volatile Organic Compounds, Namrata Baburao Deshmukh
Comparison Of Adsorption Capacities Of Nanoadsorbents With Conventional Activated Carbon For Volatile Organic Compounds, Namrata Baburao Deshmukh
Civil Engineering Theses - Archive
This research explores the potential for using single wall carbon nanohorns (SWNHs) for adsorption of volatile organic compounds (VOCs) categorized as hazardous air pollutants and which contribute to ground level ozone smog formation. It also compares the adsorption capacity of conventional activated carbon and carbon nanohorns. Carbon nanoadsorbents, with at least one dimension on the nanometer scale, can possess advantages over traditional activated carbon adsorbents in terms of binding energies or interaction potentials for physisorption. Nanotubes and nanohorns both have excellent adsorption properties due to high-energy adsorption sites in their interior (internal pores) and in the region between adjacent nanotubes/nanohorns …
Field And Experimental Studies To Assess The Performance Of Stabilized Expansive Clay, Gautham S. Pillappa
Field And Experimental Studies To Assess The Performance Of Stabilized Expansive Clay, Gautham S. Pillappa
Civil Engineering Theses - Archive
A vast majority of the expansive soils are montmorillonite-rich clays, over consolidated clays and shales. The swell and shrinkage movements of expansive soil cause considerable damage to structures such as buildings and pavements. This damage can be attributed to moisture fluctuations caused by seasonal variations. Volumetric changes typically appear in the form of cracks which will lead to the softening and vertical heaving in subsoils. Both softening and vertical expansion induce damage to overlying structures. Certain soils rich with sulfates exhibit swell and heaving even after treatment with stabilizers. The present research project was conducted at the University of Texas …
Evaluation Of Texas Cone Penetrometer Test To Predict Undrained Shear Strength Of Clays, Hariharan Vasudevan
Evaluation Of Texas Cone Penetrometer Test To Predict Undrained Shear Strength Of Clays, Hariharan Vasudevan
Civil Engineering Theses - Archive
The cone penetration test used in Texas is termed as Texas cone penetrometer (TCP), which works on dynamic principles similar to those of SPT, i.e. a hammer is used to drive the cone device for a preset depth of penetration of 12 inches. Results are typically reported in the form of N12 values. Correlations between N12 and soil strength properties are currently used by the TxDOT to determine in situ strength properties of soils prior to any infrastructure design. A research study was initiated to evaluate the existing shear strength predicting correlations used by TxDOT and its applicability for soils …
Water Damage Evaluation Of Concrete Infrastructure, Roshan Shakya
Water Damage Evaluation Of Concrete Infrastructure, Roshan Shakya
Civil Engineering Theses - Archive
This study presents an experimental program to evaluate the effect of a special waterproofing material, International Chem-Crete Pavix (CCP), on the durability of concrete. The experimental program identified the concrete mix design commonly used for pavement and other infrastructure as set by Texas Department of Transportation (TXDOT). The tests conducted include the water absorption and air void (ASTM C 642), freeze-thaw (ASTM C 666), chloride penetration (ASTM C 1202), and petrographic (ASTM C 457) test. The tests were performed on both cored and laboratory treated and untreated specimens. The absorption test was performed on the concrete specimens with water cement …
Impacts Of Signal Synchronization On Vehicular Emissions - An On-Board Measurement Case Study, Rupangi Munshi
Impacts Of Signal Synchronization On Vehicular Emissions - An On-Board Measurement Case Study, Rupangi Munshi
Civil Engineering Theses - Archive
Nearly 56% of total nitrogen oxide (NOx) emissions are produced by mobile sources. Transportation and air quality managers at the state and regional level have the responsibility of developing and evaluating Transportation Control Measures (TCMs) and Transportation Improvement Plans (TIPs) to improve air quality of the region. Signal synchronization is considered to be an effective TCM to reduce corridor congestion and maintain air quality in the region. This research was carried to determine the impacts of signal synchronization on real-world, on-road emissions. A portable instrument, OBS-1300 manufactured by Horiba Instruments Inc., was used to measure on-road tailpipe emissions of NOx …
Development Of Finite Element Method-Based Model Equations For Hollow Tapered Poles, Jiwon Jung
Development Of Finite Element Method-Based Model Equations For Hollow Tapered Poles, Jiwon Jung
Civil Engineering Dissertations - Archive
This study presents the development of three-parameter load-deflection models for steel and FRP poles commonly used to support closed circuit television cameras. An experimental investigation is carried out to obtain static load-deflection characteristics of tapered octagonal steel cross section and circular FRP cross section poles. Numerical results generated from three-dimensional isoparametric finite element model (FEM) considering coupled nonlinear algorithms for material, geometric, contact, and pre-tensioning effects are compared with those obtained experimentally. Eight-node elsto-plastic solid element is employed to model the pole, end-plate, bolts, concrete base, and laboratory reaction floor. The laboratory reaction floor is modeled with a thick plate …
Performance Evaluation Of Bamboo Reinforced Concrete Beams, Leena Khare
Performance Evaluation Of Bamboo Reinforced Concrete Beams, Leena Khare
Civil Engineering Theses - Archive
This study presents the evaluation of the feasibility of the use of bamboo as a potential reinforcement in concrete structural members. To achieve this objective a series of tensile tests on three types of bamboo Solid; Moso; and Tonkin; were conducted to obtain their constitutive relation. Also, four-point bending tests on concrete beams reinforced with bamboo were performed to identify their behavior compared to steel reinforced concrete members. Tensile tests specimens were prepared by cutting the bamboo typically in 1/2 in (13 mm) wide strips of 9 to 12 in (228 mm to 305 mm) in length. In order to …
Performance And Check-Out Verification Testing Of A New True Triaxial Apparatus Using Partially Saturated Silty Sand, Jae Hyun Park
Performance And Check-Out Verification Testing Of A New True Triaxial Apparatus Using Partially Saturated Silty Sand, Jae Hyun Park
Civil Engineering Theses - Archive
A stress-controlled, flexible boundary, true triaxial (cubical) testing apparatus has been developed to test 3-inch cubical specimen of partially saturated soil under different moisture contents and for a wide range of multiaxial stress paths. A series of HC, CTC, TC, TE, and SS tests were conducted in order to perform a thorough performance and check-out verification testing of the newly developed device by investigating the multiaxial stress-strain response of partially saturated silty sand specimens artificially prepared in the laboratory. The development of the apparatus, specimen preparation process, test procedure, and the corresponding validation of its suitability for testing partially saturated …
Nonlinear Finite Element Model Analysis Of Human Accommodation Lens, Tri Le
Nonlinear Finite Element Model Analysis Of Human Accommodation Lens, Tri Le
Civil Engineering Theses - Archive
The crystalline human lens is modeled by using the finite element software, ABAQUS/CAE Version 6.5-1 as an axisymmetric shell to study the optical power and displacement of anterior and posterior poles induced due to zonule traction. Several different element types were tested to obtain the optimum mesh. These elements were three and six-noded triangular hybrid and four-noded quadrilateral hybrid for modeling of the cortex and nucleus. Constant strain triangular and regular quadrilateral elements were examined for modeling the capsule. One dimensional two degree of freedom spring elements were used to model the anterior, posterior, and equatorial zonules. Five different lens …
Seasonal And Spatial Variation Of Subgrade Response, Mustaque Hossain, Stefan Romanoschi, Andrew J. Gisi
Seasonal And Spatial Variation Of Subgrade Response, Mustaque Hossain, Stefan Romanoschi, Andrew J. Gisi
Civil Engineering Faculty Publications - Archive
Temperature, subgrade moisture content, and Falling Weight Defleetometer (FWD)-deflection data were collected monthly on four asphalt pavement test sections in Kansas for a year. The subgrade moduli were baekealeulated using the elastic layer theory. It was found that for almost all sites, the monthly variation in subgrade moisture content was not very significant over the seasons. The patterns of subgrade response, in terms of subgrade moduli versus time, simulated sine-shaped forms signifying a possible temperature effect. Higher variabilities across the site were associated with the extreme temperature conditions, usually very low or high average pavement temperatures. In all cases, the …
The First Full-Scale Accelerated Pavement Test In Louisiana: Development And Findings, J.B. Metcalf, Stefan Romanoschi, Y. Li, M. Rasoulian
The First Full-Scale Accelerated Pavement Test In Louisiana: Development And Findings, J.B. Metcalf, Stefan Romanoschi, Y. Li, M. Rasoulian
Civil Engineering Faculty Publications - Archive
The Pavement Research Facility in Port Allen, Louisiana houses the first full-scale accelerated pavement testing experiment in the state. The purpose of the first experiment was to evaluate the historically prevalent flexible crushed stone and in-place soil cement stabilized base construction in comparison to several alternative base construction materials and construction processes for pavements designed for a semi-tropical climate. Loading is provided by an Accelerated Loading Facility (ALF) machine, the second of its type in the United States. More than six million equivalent axle loads (ESALs) were applied to the nine test lanes. Performance of the pavement structures and materials …