Speed-flow-density Study of two different Indian roads and their comparisons

Abstract :-
In this work speed -flow-density study of an Indian road has been conducted. Data has been collected using video camera and later decoded in computer. This data is very essential to estimate capacity of an Indian road. Since the collected data is of a narrow density domain, capacity prediction from this data is not promising. One of the data is collected in Chennai and another data is from Rourkela .Both the data’s were compared statistically. For both the data’s Z-value is calculated and it is compared with Z-critical to define whether both the data’s are same or different. Continue reading Speed-flow-density Study of two different Indian roads and their comparisons

Characterization of Delayed Ettringite Formation in Maryland Bridges

Abstract :-
The research investigated the significance of Delayed Ettringite Formation (DEF) presences in the Maryland Bridge Inventory. The objective of the research included investigating possible presence of DEF, correlations between the presence of DEF in cast-in-place concrete and moist map cracking, and correlations between presence of DEF in cast-in-place concrete and air entrainment agents (AEA). The research required coring a target population, so that scanning electron microscope (SEM) with energy dispersive analysis x-ray (EDAX) could be utilized to identify DEF in the concrete. Continue reading Characterization of Delayed Ettringite Formation in Maryland Bridges

Characterization of Damage in Mortar and Concrete Specimens due to Delayed Ettringite Formation (DEF)

Abstract :-
Delayed ettringite formation (DEF) in concrete and mortar systems has been associated with deleterious expansion leading to its premature deterioration. DEF causes a characteristic form of damage which is highly influenced by the cement chemistry, curing methods and exposure conditions. While the cement paste expands, the aggregate does not and cracks around these aggregates that usually form during curing, grow over time and eventually become filled with DEF at a later age. Continue reading Characterization of Damage in Mortar and Concrete Specimens due to Delayed Ettringite Formation (DEF)

Characterization and Mobilization of Arsenic in Various Contaminated Materials

Abstract :-
Arsenic is a potentially toxic contaminant of concern even at relatively low concentrations in the environment. The complex chemistry of arsenic in the environment is influenced by a variety of chemical and physical factors. The presence of iron minerals is believed to be particularly important to arsenic mobility. Extraction methods were used to evaluate arsenic and iron in a variety of contaminated materials including mine tailings and soils. Continue reading Characterization and Mobilization of Arsenic in Various Contaminated Materials

The Characteristics and Impacts of Imperviousness From a GIS-based Hydrological Perspective

Abstract :-
With the concern that imperviousness can be quantified differently depending on data sources and methods, regression equations to translate between imperviousness estimates using land use and land cover were developed. In addition, this study examined how quantitatively different imperviousness estimates affect the prediction of hydrological response. The regressions between indicators of hydrological response and imperviousness-descriptors were evaluated by examining goodness-of-fit measures such as explained variance or relative standard errors. Continue reading The Characteristics and Impacts of Imperviousness From a GIS-based Hydrological Perspective

Catalog of Material Properties for Mechanistic-Empirical Pavement Design

Abstract :-
The new pavement design methodology is based on mechanistic-empirical principles that are expected to be used in parallel with and eventually replace the current empirical pavement design procedures. The new mechanistic-empirical pavement design guide (MEPDG) requires greater quantities and quality of input data. Material characterization for the mechanistic-empirical approach, the focus of this thesis, is significantly more fundamental and extensive than in the current empirically-based AASHTO Design Guide. The objective of the thesis is to develop an organized database of material properties for the most common paving materials used in Maryland. A comprehensive material property database in Microsoft Access 2007 has been developed. The database is initially populated with all information received from SHA. It provides complete data management tools for adding and managing future data as well as data display screens for MEPDG. Recommendations for future material testing for Maryland are also provided. Continue reading Catalog of Material Properties for Mechanistic-Empirical Pavement Design