American Studies Commons^™

Effect Of Tricalcium Silicate Content On Expansion In Internal Sulfate Attack, Troy T. Whitfield

USF Tampa Graduate Theses and Dissertations

The purpose of this study was to determine the cementitious parameters and placement temperature that impact internal sulfate attack in concrete. Concrete structures make up a large percentage of the infrastructure and multifamily housing. Durability is very important. Cements can be formulated to reduce the impact of external environmental exposure such as high salinity from marine environments or high sulfate levels from soils or surface waters. Concrete is also subject to internal attack such as alkali aggregate reaction, (AAR), and delayed ettringite formation, (DEF). This study focused on some of the cement chemistry issues that determine susceptibility of cement to …

Inorganic Sorption In Polymer Modified Bentonite Clays, Melody Schwartz Nocon

USF Tampa Graduate Theses and Dissertations

In 1986, geosynthetic clay liners (GCLs) were invented and successfully used as a replacement for the soil layer in composite lining systems. In some applications an additive (polymer) is mixed with the bentonite to increase performance, especially in those that have low concentrations of sodium bentonite (EPA 2001).Studies showing significant increases in hydraulic conductivity values for bentonite in the presence of high salt concentrations are frequently documented and there is a risk of early breakthrough due to performance failure of the GCL clay component. (Ashmawy et al, 2002). It has also been stated that sodium, potassium, calcium, and magnesium have …

Control Of Hydrogen Sulfide From Groundwater Using Packed-Bed Anion Exchange And Other Technologies, Camilo Romero Cotrino

USF Tampa Graduate Theses and Dissertations

Hydrogen sulfide imparts odors and taste to drinking water and can be corrosive to distribution systems. Groundwater sources used to produce drinking water tend to have sulfide concentrations ranging from below 0.1 to over 3 mg/L. Under anaerobic conditions, hydrogen sulfide can be formed from reduction of sulfate and elemental sulfur through chemical or biological reactions. Therefore, to decrease the potential for hydrogen sulfide in water systems, control of all forms of sulfur should be consistent.

Hydrogen sulfide in groundwater can be controlled through conversion or removal mechanisms. Conversion reactions result from chemical or biological reactions that oxidize hydrogen sulfide …

Development Of A Gis Based Infrastructure Replacement Prioritization System; A Case Study, Brian D. Pickard

USF Tampa Graduate Theses and Dissertations

Maintenance, repair, and replacement of transmission mains and distribution system piping is expected to cost approximately $75 billion over the next two decades to ensure that public water systems are capable of providing the United States with safe drinking water. However, there is a significant gap between the funds available and the projected costs of infrastructure replacement or rehabilitation. Infrastructure Management Systems (IMS) have been developed to assist utilities and decision-makers in determining how to allocate resources for infrastructure. This project utilizes theTampa Water Department (TWD) as a case study to develop a tool for prioritizing infrastructure replacement.

TWD is …

A Damage Assessment And Wind Loading Analysis Of Residential Structures Built Post-1996 In Punta Gorda In The Wake Of Hurricane Charley, James Newberry

USF Tampa Graduate Theses and Dissertations

One of the communities in the path of Hurricane Charley as it came ashore

August 13, 2004, was Punta Gorda, recording gusts up to 145 mph. This project

utilizes aerial photos taken approximately 10 days after the storm battered the

area, using a digital photography program. Focusing on the one-story residential

structures (houses) of the Punta Gorda area, a damage assessment could be

made of the area’s homes, and how they stood up to the storm. This study

focused further on homes built after major changes to the local/state building

codes went into effect (starting in 1996) after the devastation …