ASM International San Fernando Valley Chapter Presents

November 2005 Meeting

Student’s Night and CSUN Alumni Night Presented by CSU, Northridge   Corrosion Sensors for High-Strength Steel Strands in Suspension Cables – Ami Garcia Corrosion sensors have been highly sought after due to high levels of corrosion evident inside the main cables of suspension bridges. This research describes the design of atmospheric corrosion sensors used to assess corrosion rates within main cables. The sensors were exposed to four different atmospheric conditions: wet/dry cycles in water, wet cycles in water, wet/dry cycles in salt water and wet cycles in salt water. For each atmospheric condition, the sensors were tested on a potentiostat for three different periods of time: the first was set for an hour long period at intervals of fifteen minutes; the second was set for twenty-four hours at intervals of four hours each; and the third was set to test once daily for four consecutive days. A scaled down model of a main cable was also constructed with one sensor placed in the outside perimeter of the cable and four others inside the main cable.   Fracture Properties of Multi-layered Steel Fiber-Reinforced Concrete – Victor Cervantes Fiber reinforced concrete has recently been used to increase the energy absorption capacity and toughness of concrete. The fibers can be made of materials like steel, polypropylene, or polyethylene and are randomly mixed into the concrete mixture; they make up less than one percent of the mixture by volume. This study uses steel crimped fibers as an additive to a concrete mixture. Multi-layered steel fiber reinforced concrete beams, measuring 700 mm long, 150 mm high, and 80 mm deep, were tested using the two-parameter fracture model test after seven days of curing. Results showed that the steel fiber reinforced concrete increased fracture energy of the beams. On average, the specimen configuration which had the Steel Fiber Reinforced Concrete (SFRC) layer on top of the plain concrete layer had a total fracture energy that was about 3.3 times greater than the plain concrete beams. Synthesis of Faceted BaXSrX-1TiO3 Microcrystals - Nallely Olguin Faceted microcrystals of BaTiO3 and SrTiO3 were made. For the BaTiO3 microcrystals to facet, heating to a temperature of 1100°C for 10 hours was required, while SrTiO3 required 1300°C for 8 hours. The increase in salt does not make much of a difference, what is more helpful in attaining single crystals for the SrTiO3 is magnetic stirring overnight. BaTiO3 and SrTiO3 are reacted to create BaSrTiO3. X-ray diffraction shows the two react fully when pressed with 6,366 psi and heated to 1200°C for 15 hours. Photochemical reactions are done on various materials using a 350W ultra-violet lamp. Their anisotropic reactivity with silver is examined. Some crystals show that Ag covers certain faces, such as ZnO and BaXSrX-1TiO3. It is also observed that Ag accumulates on the steps that form on crystals.

		Pratt Whitney Rocketdyne

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