Engineering Commons^™

Properties Of Concrete Mixtures Incorporating Magnetized Water, Mohamed Abdel Raouf Metwally

Archived Theses and Dissertations

Water is a vital constituent that controls much of concrete properties such as strength and workability. Water is added to concrete in the form of a liquid at ambient temperature. However, it is occasionally added in the form of hot water in freezing conditions or in the form of ice/chilled water in hot weathering conditions. Recently, work has been conducted to magnetize water to adequate level before being incorporated in concrete. Indications show that some improvements can occur to concrete made with magnetized water. However, there is scarcity of data as to how such magnetized water can influence the properties …

Behavior Of Structural Concrete Members Strengthened By Composite Fabrics, Jian Chen

Dissertations

The new technique of using Fiber Reinforced Polymer (FRP) materials to repair and strengthen various concrete members is becoming more and more popular in structural retrofitting field. Among all the confining materials, Carbon Fiber Reinforced Polymer (CFRP) fabric jackets are identified as an effective way to enhance the strength and ductility of concrete members due to its superior mechanical properties. This study investigates the detailed structural behavior of confined concrete members using CFRP fabric jackets by both analytical and experimental approaches.

A series of CFRP wrapped concrete cylinder tests were conducted to study the compressive stress-strain behavior for CFRP confined …

Structural Condition Assessment Of Prestressed Concrete Transit Guideways, Robert Zachary Shmerling

Electronic Theses and Dissertations

Objective condition assessment is essential to make better decisions for safety and serviceability of existing civil infrastructure systems. This study explores the condition of an existing transit guideway system that has been in service for thirty-five years. The structural system is composed of six-span continuous prestressed concrete bridge segments. The overall transit system incorporates a number of continuous bridges which share common design details, geometries, and loading conditions. The original analysis is based on certain simplifying assumptions such as rigid behavior over supports and simplified tendon/concrete/steel plate interaction. The current objective is to conduct a representative study for a more …