The objective of this research is to enhance the properties concrete by using Fly Ash as a partial substitution concrete. Tests carried out on cement are Initial and Final setting time aggregates, specific gravity sieve analysis. mean target strength with given compressive at 28 day quality control level calculated. Concrete blend proportions for first tryout mix calculated casting cube 15mm si...

Lattice-type bi-block reinforced concrete (RC) sleepers have been widely used for cast-in-place slab tracks. However, the standards manufacturing, inspection, and performance verification of lattice-type RC are not well established, even when such a sleeper is critical component track. Therefore, it necessary to develop new standard sleepers. In this study, requirements relevant were investigat...

The IEEE 802.16 standard defines the ARQ mechanism as a part of the MAC layer. The functioning of the ARQ mechanism depends on a number of parameters. The IEEE 802.16 specification defines them but it does not provide concrete values and solutions. This paper studies the key features and parameters of the 802.16 ARQ mechanism. In particular, we consider a choice for the ARQ feedback type, an al...