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Ice Adhesion Analysis Of Severely Aged Pdms Rubbers, Theodore R. Woll
Ice Adhesion Analysis Of Severely Aged Pdms Rubbers, Theodore R. Woll
Electronic Theses and Dissertations
The goal of this study was to evaluate and optimize the ice adhesion test initially developed by the University of Denver and to examine Polydimethylsiloxane (PDMS) based silicone rubbers for their ice-phobicity as a function of their physical and chemistry properties, and under severe oxidative aging. The test is based on an ice block bonded to a silicone rubber substrate and subjected to shear. In its original state, the test had severe limitations that caused the ice to be dislodged through a mixture of shear and peeling. Several steps were taken in this research to improve the test, and the …
The Investigation Of Nano Silica In The Cement Hydration Pro, Jonathan Samuel Belkowitz
The Investigation Of Nano Silica In The Cement Hydration Pro, Jonathan Samuel Belkowitz
Electronic Theses and Dissertations
With the advent of nano technology, materials have been developed that can be applied to high performance concrete mix designs. Nano silica reacts with calcium hydroxide (CH) to develop more of the strength carrying structure of cement: calcium silica hydrate (CSH). In this paper, relationships have been developed to distinguish the benefits when using different sizes of nano silica in cement paste. An extensive regime of experimental analysis was carried out to determine the effect of nano silica. Through these experiments the heat of hydration of multiple cement mix designs was measured. After that, the concentration of CH was recorded …