EXPERIMENTAL STUDY ON STRENGTH & DURABILITY CHARACTERISTICS OF SPECIAL CONCRETE BY USING PHOSPHOGYPSUM WITH STEEL FIBRE
Authors: Prof. B.JOSE RAVINDRA RAJ, E.SUBIAR AHAMED
Abstract
Most Concretes produced today contain materials in addition to Portland cement to help achieve the strength or durability performance. These materials include fly ash, silica fume and ground-granulated blast furnace slag used separately or in combination. In this project we used phosphogypsum as admixture to improve the performance of concrete. It is a waste material obtained from fertilizer manufacturing. Also, steel fiber is introduced to increase the tensile strength of concrete. The grade of concrete used is M20 & M25. For both the mixes, phosphogypsum is added as 0%,15%, 20% & 25%. The steel fiber is kept constant for all the mixes as 50kg/m3. The material testingโs done to arrive the mix proportion. The fresh concrete properties are studied. Harden concrete properties of concrete like compressive strength, split tensile strength are done and the results are enclosed in this report. It was found that the concrete with 15% phosphogypsum & 50kg/m3 shown good performance both in fresh and harden state..
EXPERIMENTAL INVESTIGATION ON CORROSION IDENTIFYING AND ENHANCEMENT OF EXISTING CONCRETE STRUCTURES
Authors: Prof. B.JOSE RAVINDRA RAJ, R.PRADEEP RAJ
Abstract
Corrosion on structure is one of the biggest challenges faced by the civil engineers. Since repairing at rehabilitation requires costly treatments without considering corrosion damages on the structures. Identifying the corrosion on the concrete structure requires more research to solve effectively. A majority of concrete structure is shows signs of degradation due to the corrosion of the reinforcement in the presence of chlorides. In some cases, the degradation is visible with in few years of construction completion. Despite the fact that the concrete structure is particularly suffer premature degradation due to corrosion, due to poor construction quality as a result of poor workmanship
On ๐โ๐wg -Continuous Multifunctions in Topological spaces
Authors: A.Ponsuryadevi, R.Selvi
Abstract
In this paper, we introduced and studied basic properties of weaker form of multifunctions such as upper and lower ๐โ๐wg-continuous multifunctions. We obtain some of its characterizations with totally ๐โ๐wg-closed graph and strongly ๐โ๐wg-closed graph in Minimal Structures.