Civil and Environmental Engineering Commons^™

Air Stripping Of Volatile Organic Contaminants Using Rotating Disc Contactor, Kai-Ping Hsueh

Dissertations

Previous studies have suggested that the transfer of VOCs to the atmosphere by air stripping may be a convenient and potentially cost-effective method to remove these compounds from the water. A Rotating Disk Contactor (RDC), similarly to other aeration devices, can provide intimate contact between the VOC-bearing water and air. It is believed that under carefully selected operating conditions, the RDC system are more competitive with packed tower than other aeration methods. The objectives of this study were to evaluate the feasibility of using the RDC to strip VOCs from the contaminated water and to develop a mathematical model to …

Permeability And Volume Change Characeristics Of Bentonite-Sand Mixes In A Contaminant Environment, Yuan-Hsun Wu

Dissertations

This research was conducted to study the characteristics of permeability and volume change of bentonite-sand mixes due to contaminants. The soil specimens consisted of clean sand, bentonite, and fly ash. Test liquids included seven diluted organic and inorganic chemicals and a landfill leachate.

Index tests included liquid limit, expansion, cracking, and sedimentation tests. Expansion tests proved to be the most useful for permeability evaluation in a contaminant environment.

The conventional consolidometer permeameter and flexible wall permeameter proved to be not completely satisfactory for testing soft bentonite mixes. A triple ring permeameter was developed to compensate for the limitations of these …

Adsorption And Desorption Of Chromium On Clayey Soils, Ker-Shu Tan

Theses

Chromium residue waste was produced during sixties in the chromium production process. It was used as construction fill. Problems associated with chromium waste sites include structure distress and surface and groundwater contamination.

The purpose of this study was to investigate the adsorption and desorption of chromium on soil. In order to achieve this purpose, experiments were conducted to study the effect of pH, type of chromium compound, and type of soil on adsorption and desorption.

Experiments were performed on kaolinite, bentonite and sand. In our study, it was found that sand had almost no adsorption for chromium. Kaolinite had less …

Experimental Evaluation Of J-Integral For Fiber Reinforced Concrete Subjected To Impact Loading, Piyushkumar Patel

Theses

This research presents an experimental Evaluation of J-Integral for Fiber Reinforced Concrete Subjected to Impact Loading. Three-point edge notched bend specimen were employed in evaluation of J-Integral using both the multi-specimen, and the single specimen techniques. In the multi-specimen technique three different notch lengths were employed for extracting the energetic fracture parameter J_Ic. In the single specimen technique, the method developed by Rice[13] was used to evaluate J_Ic at three different notch lengths.

Different proportions of fiber were employed in determining the J_Ic values. Experimental results from present study indicates that the J_Ic values calculated …

Optimal Design Of Prestressed Concrete Members Using Numerical Techniques, Nasseruddin Syed

Theses

This research consists of the application of nonlinear optimization techniques for the economical design of prestressed concrete members. A computer program using Lattice and Matrix methods of optimization is employed for least weight design of I-shaped prestressed concrete girders. The program calculates the most optimum values of the cross-sectional dimensions.It has the freedom to impose any constraints on any of the design variables, including sectional dimensions, eccentricities, concrete cover and limiting stresses.

Comparison of results obtained in this thesis with other analytical methods indicate that with the advent of computers, the numerical methods have a definite advantage over other analytical …

Competitive Bidding Strategy In The Construction Industry : A Game Theoretic Approach, Hongbin Chen

Theses

A game theoretic approach is applied to analyze competitive bidding in the construction industry because previous models do not consider the conflict of interest that exists among competitors. The game theoretic model improves corporate performance when compared to previous Bayesian analyses.

The game theoretic model is discussed in conjunction with construction contracting practice. Competitive bidding is formulated as a game theoretic model in which a contractor optimizes his bid price to maximize his utility or corporate performance. Using available historical data, order statistics are employed to access the distribution of estimated costs among bidders for a project. The winner's curse …

Sediment Transport/Sand Bypassing Analysis At Manasquan, Nj, Christopher Clemens Obropta

Theses

An experiment to determine the longshore sediment transport rate using a fluorescent dyed sand tracer was conducted during the summer of 1987 to help determine the feasibility of sand bypassing at the Manasquan Inlet in New Jersey. After the fluorescent sand tracer was introduced to the longshore transport system, the Spatial Integration Method was used to sample the surf zone. The Spatial Integration Method allowed the tracer cloud to be monitored in both time and space. The tracer experiment provided a constant to be used in the calculation of the longshore sediment transport rate. This constant is specific to the …

Laboratory Model Studies Of Pneumatic Fracturing Of Soils To Remove Volatile Organic Compounds, Panayiotis Papanicolaou

Theses

Bench-scale laboratory studies were conducted from January 1988 to October 1988 to demonstrate the feasibility of using Pneumatic Fracturing* to enhance the removal of Volatile Organic Compounds from the vadose soil zone. Experiments were conducted to investigate: 1) The effect of pneumatic fracturing on the rate of contaminant removal; and 2) the injection pressures required to initiate soil fracturing.

Contaminated soil was placed and compacted in three identical 15 inch square by 30 inch high plexiglass tanks. The first tank was equipped with a vapor extraction system consisting of vacuum and/or positive air injection. The second tank was equipped with …

Slurry Wall Backfill Integrity And Desiccation, Mahendraratnam Thilliyar

Theses

The upper reaches of slurry wall, in a waste containment structure may under go cycles of wetting and drying, because of seasonal ground water level fluctuations. This may result in desiccation and cracking of back fill material. Experiments were conducted to study these effects with water, aniline, phenol, hydrochloric acid solutions on soils containing different proportions of bentonite, kaolinite, and sand. The largest crack was formed with phenol and the smallest with water. With hydrochloric acid no crack was formed. With increase kaolinite content, the width and density of crack decreased. Hydraulic conductivity tests on cracked specimens indicated high hydraulic …

Thermal Desorption Of Phenol Contaminated Clay Soils, Chia-Ling Ting

Theses

Clay mineral/organic reactions have been studied extensively by a numerous physicochemical methods. There also has been extensive research done in the areas of adsorption, Lewis acid-base reactions, desorption, adduct formation. Many of these studies explain the role and dehydration of silicates.

Studies have shown through extraction, thermal analysis, and gas chromatography. That there is more than one type of bonding, weak and strong, taking place between the clay mineral and the organic waste.

In order to determine the practicality of the containment technology, this research has been investigated by using more powerful tools, such as thermogravimetric analysis, differential scanning calorimetry …

Dynamic Analysis Of Linear Structural System Using Ritz Vector Method And Substructuring Formulation, Vijay R. Modi

Civil & Environmental Engineering Theses & Dissertations

In this study, the substructuring formulation is incorporated into Ritz Vector method to obtain and solve the reduced system of dynamic equilibrium equations. Two-dimensional and three-dimensional truss problems are considered in the present study. The accuracy and computational time using the proposed technique are compared with known solutions. The effect of using different number of substructures and Ritz vectors are also investigated, equations solver is utilized to Moreover, a version of a parallel further enhance the numerical performance of the proposed technique on the FLEX/32 Multicomputer.

Irish Building Services News

Building Services Engineering

No abstract provided.

Irish Building Services News

Building Services Engineering

No abstract provided.

An Experimental Study Of Dewatering Of Alum Sludge, Uday G. Kelkar

Civil & Environmental Engineering Theses & Dissertations

The use of aluminum sulfate (Alum) as a coagulant for treating surface water was introduced in 1884. When this salt is added to water, the aluminum Ion hydrolyzes by reaction that consumes alkalinity in water. The gelatinous hydroxide thus formed in the reaction, carries suspended material with it as it settles. In addition, however, it is likely that positively charged hydroxyl-bridge dimmers and higher polymers are formed which interact specifically with the colloidal particles, bringing about coagulation. These gelatinous floes settle by gravity, called sludge, consists of relatively large quantities of suspended and colloidal inorganic and organic materials.

The disposal …

Irish Building Services News

Building Services Engineering

No abstract provided.

Experimental Evaluation Of J-Integral For Concrete Subjected To Impact Loading, Naishan Zhang

Theses

This thesis presents an experimental evaluation of J-integral for concrete subjected to impact loading. Twenty four three-point bend specimens with two different thicknesses and mid-span notch lengths were tested under impact velocities of 167.22 in/sec (424.74 cm/sec) and 261.78 in/sec (664.92 cm/sec). Multi specimen method was used to analyze and estimate J_I and its critical J^-Ic values. Effects of specimen thickness and impact velocity on J^-Ic values were observed and discussed. Evaluation of J^-Ic Values from the experimental results of this study indicated that can be characterized as a material constant even under different impact velocities. …

Study Of Steel-Concrete Interface Behavior Of Reinforced Concrete Members, Jun Wan

Theses

The main objective of this thesis work is to study the steel-concrete interface behavior of reinforced concrete members using the nonlinear finite element method.

The reinforced concrete member was modeled as a continuum consisting of plane stress rectangular elements which represent the concrete, pin-joint two node bar elements which represent the reinforcing steel, and the nondimensional linkage elements which represent the bond stress-slip, aggregate interaction and dowel action effects. The load increment procedure is employed to carry out the nonlinear analysis.

An axially loaded tensile specimen, a deep beam specimen and a shallow beam specimen were analyzed. The results from …

Feasibility Study Of Maine's Small Hydropower Potential, James D. Sysko

Maine Collection

Feasibility Study of Maine's Small Hydropower Potential

Prepared by James D. Sysko, Small Hydro East, for the Maine State Planning Office, Maine Office of Energy Resources, January 1989.

"This study focuses on finding potential hydropower sites of approximately 50 kw to 1000 kw in capacity."

Traffic Speed Report No. 122, David L. Cochran, Leroy Gray, Donald W. Genda

JTRP Technical Reports

No abstract provided.

1988 Update Of The Indiana Highway Cost Allocation Study, Kumares C. Sinha, Sunil K. Saha, Tien Fang Fwa, Ah Beng Tee, Harold L. Michael

JTRP Technical Reports

No abstract provided.

Construction Specifications For Highway Projects Requiring Horizontal Earth Boring And/Or Pipe Jacking Techniques: Executive Summary, Donn Edward Hancher, Thomas D. White, David Thomas Iseley

JTRP Technical Reports

No abstract provided.

Bond Of Epoxy Coated Reinforcing Steel In Concrete Bridge Decks : Informational Report, Douglas Bruce Cleary, J. A. Ramirez

JTRP Technical Reports

No abstract provided.

Construction Specifications For Highway Projects Requiring Horizontal Earth Boring And/Or Pipe Jacking Techniques, Donn Edward Hancher, Thomas D. White, David Thomas Iseley

JTRP Technical Reports

No abstract provided.

The Development Of Optimal Strategies For Maintenance, Rehabilitation, And Replacement Of Highway Bridges: Volume 3 - Bridge Traffic Safety Evaluation, Sudhir Murthy, Kumares C. Sinha

JTRP Technical Reports

No abstract provided.

An Investigation Of Surface Coatings On Exposed Concrete : Executive Summary, Luh M. Chang, Peter Scott Garner

JTRP Technical Reports

No abstract provided.

The Development Of Optimal Strategies For Maintenance, Rehabilitation, And Replacement Of Highway Bridges: Volume 6 - Performance Analysis And Optimization, Yi Jiang, Kumares C. Sinha

JTRP Technical Reports

No abstract provided.

An Evaluation Of Leading Vs. Lagging Left Turn Signal Phasing : Executive Summary, Joseph E. Hummer, Robert E. Montgomery, Kumares C. Sinha

JTRP Technical Reports

No abstract provided.

Development Of Asphaltic Concrete Overlay Design Procedure For Rigid Pavements In Indiana, Norman D. Pumphrey, Thomas D. White

JTRP Technical Reports

No abstract provided.

An Investigation Of Surface Coatings On Exposed Concrete, Luh M. Chang, Peter Scott Garner

JTRP Technical Reports

No abstract provided.

Laboratory Investigations On Latex-Modified Concrete : Executive Summary, Sidney Diamond, Qizhong Sheng

JTRP Technical Reports

No abstract provided.