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S. Suchithra ¹, R. Malathy ²

Affiliations
1 Kongu Engineering College, Perundurai, Tamil Nadu, IN
2 Sona College of Technology, Salem, Tamil Nadu, IN

Abstract

An experimental study on the workability of self-compacting concrete (SCC) with three mineral admixtures which are obtained as waste products from industries were studied. The materials used for the study are fly ash (FA), Silica fume (SF), rice husk ash (RHA) along with OPC cement. Self compacting concrete is a special concrete, which can be placed and compacted under its own weight with little or no vibration effect, and which is at the same time cohesive enough to be handled without segregation or bleeding. The work involves four types of mixes, the first consisting of fly ash, the second uses FA and silica fume the third uses a mixture of FA and rice husk ash and the fourth, a combination of fly ash, silica fume and rice husk ash. After each mix proportion was arrived, its workability was checked and cubes were cast, cured and strength check made. The results show that SCC with 10% of SF and 20% fly ash combination gives higher values of compressive strength than those with 30% replacement of FA.

Keywords

Fly Ash, Silica Fume, Rice Husk Ash, Self Compacting Concrete.

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P. S. Kothai ¹, R. Malathy ²

Affiliations
1 Department of Civil Engineering, Kongu Engineering College, Perundurai, Erode-638 052, T.N., IN
2 Sona College of Technology, Salem-636 005, T.N., IN

Abstract

Steel slag, a by-product of steel making, is produced during the separation of the molten steel from impurities in steel-making furnaces. The slag occurs as a molten liquid melt and is a complex solution of silicates and oxides that solidifies upon cooling. It is estimated that 115-180Mt of steel slag is poured out annually worldwide and in addition to this previous accumulation of the material has created mountains of steel slag. In India, steel slag output is approximately 20% by mass, of the crude steel output. The slag in India is used mainly in the cement manufacture and in other unorganized work, such as landfills and railway ballast. In order to reduce the pollution load on landfill for the disposal of steel slag at steel industries, it can be effectively utilized in construction as aggregates in concrete. Use of waste materials can solve problems of lack of aggregate in various construction sites and reduce environmental problems related to aggregate mining and waste disposal. The use of waste aggregates can also reduce the cost of the concrete production. In this research work an attempt is made to utilize the steel slag as partial replacement material for natural aggregates in concrete. 10% to 100% replacement was done in 10% increment and fresh and hardened concrete properties were studied.

Keywords

Utilization of Wastes, Steel Slag, Waste Aggregates, Concrete.

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R. Malathy ¹, N. Rajkumar ¹

Affiliations
1 Department of Civil Engineering, Kongu Engineering College, Perundurai, Erode-638 052, Tamilnadu, IN

Abstract

This paper aims to provide a solution to the prevailing environmental problems due to wastewater from textile industries and dumping of fly ash by the thermal power plants in India. This work is an attempt to find out a solution through low cost treatment methodology. In this study, fly ash, which is produced as waste from the thermal power plant, was used as an adsorbent for the wastewater from textile processing industries particularly in Tirupur region of Tamilnadu. This is an attempt to make use of fly ash as a material to reduce the pollutant concentration in the textile industries wastewater. Column technique has been adopted in this study for adsorption. The fly ash used in this experimental study was collected from the Mettur Thermal Power Plant. The fly ash was used as an adsorbent by packing it in PVC column in different layers with alternative layers of sand in between them. The dyeing effluent was allowed to flow through it from the top with suitable arrangements. The dye stuffs were found to get adsorbed on the fly ash layer. The fly ash was separated and dried later.

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R. Dharmaraj ¹, R. Malathy ²

Affiliations
1 Department of Civil Engineering, University College of Engineering Panruti, Panruti - 607106, Tamil Nadu, IN
2 R&D, Department of Civil Engineering, Sona College of Technology, Salem - 636005, Tamil Nadu, IN

Abstract

A kind of special concrete known for its flowing property and the mixture affixes under its self-weight. Henceforth under congested circumstance it obviates the difficulty of placing concrete moreover reducing the time in setting up large sections meanwhile affording increased strength and commanding durability characteristics than standard concrete. The major consequence facing all around is that durability concern with respect to corrosion of steel. The premature failures in concrete are caused due to this corrosion of steel. To improve a service life of concrete, corrosion inhibitors have been used as effective measures to inhibit corrosion. But there are numerous inhibitors were exists in the market. Only Sodium Nitrite (SN) has proven corrosion inhibiting capabilities simultaneously refine the mechanical properties of concrete. Therefore the presence of sodium nitrate in the self compacting concrete as the corrosion inhibiting admixture, the strength and corrosion resisting properties were studied by the dosage added 0%, 1%, 2%, 3%, 4% and 5%, by the weight of cement. Mix design for M25 grade of concrete according to BIS method (IS 10262:2009). Cement is replaced with consistent percentage of fly ash (40%). Then the standard concrete mix proportions were modified into SCC properties as per EFNARC specifications and different trail mixes were done. The investigation on the properties of self compacting concrete in spite of the effect of corrosion inhibiting admixture is done on the trial basis. The effect of Corrosion inhibiting admixture (a sodium nitrate based inhibitor) along with the properties of fresh concrete and the hardened concrete are determined. From the results it is proven that the self compacting concrete increases the strength of the concrete with accretion of inhibitor (sodium nitrite). Ultimately it was concluded that the compressive strength of cubes at 3% of sodium nitrite was increased strength by 8.8% in comparison with standard self compacting concrete (SN0) mix.

Keywords

Admixtures, Corrosion Inhibitor, Fresh Characteristics, Hardened Properties, Self Compacting Concrete, Super Plasticizer

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R. Malathy ¹, M. Geetha ²

Affiliations
1 Department of Civil Engineering, Sona College of Technology, Salem, Tamilnadu, IN
2 Department of Civil Engineering, CSI Polytechnic College, Salem, Tamilnadu, IN

Abstract

This paper focusing on the usage of biomaterials as self-curing agents in concrete. Biomaterials like Calatropis Gigantea (CG) and Spinacea Oleracia (SO) are found to be equivalent to the existing chemical admixture Polyethylene Glycol since they have specific characteristic of holding water and releasing whenever it is needed as internal reservoirs like self-curing agents and their microstructural properties are resembling Polyethylene Glycol. From the previous studies, it was found that these biomaterials of a small quantity of about less than 1% by weight of cement performing better than PEG and found to be cost effective and no need of water curing of the day one of concreting and achieving the required strength 9-13. This paper discusses on the strength development of self-cured concrete using above said biomaterials at the age of 3, 7, 14, 21, 28 and 56 days without water curing and compared with the performance of conventional water cured concrete specimen. Also splitting tensile strength and flexural strength of both concrete at 28 days were determined and compared. From the results, it is found that Spinacea Oleracia is performing better than CG and PEG.

Keywords

Self-Curing, Calatropis Gigantea, Spincea Oleracea, Polyethylene Glycol, Strength.

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