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Effects of fly-ash and polypropylen fibers on the properties of roller compacted concrete

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In this thesis, effects of fly-ash and polypropylene fibers on the properties of roller compacted concrete (RCC) designed for highway pavement application were investigated.
In the first part of the study; water contents of 16 different RCC mixtures, containing 0, 20, 40 and 60% fly-ash by mass of binder material and 0, 0.25, 0.50 and 0.75% [...]

Nis

1

Production and characterization of porous titanium alloys

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In the present study, production of titanium and Ti6Al4V alloy foams has been investigated using powder metallurgical “space holder technique” in which magnesium powder were utilized to generate porosities in the range 30 to 90 vol. %. Also, sintering of titanium and Ti-6Al-4V alloy powders in loose and compacted condition at various temperatures (850-1250oC) and [...]

Nis

1

Investigation of the effect of cr additives on mechanical properties and microstructure of the zinc-aluminum-based Za-12 alloy

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At present, ZA alloys are used in many areas/applications instead of conventional casting alloys such as Al alloys, brass, bronze and cast iron alloys. This is reason that ZA alloys have good castability, high strength; good wear resistance and high ratio of strength to weight. The most important advantage of ZA alloys, in addition to [...]