Nature Environment and Pollution Technology

R. Thenmozhi ¹, N. Balasubramani ²

Affiliations
1 Deptt. of Civil Engineering, Government College of Technology, Coimbatore, Tamil Nadu, IN
2 Deptt. of Civil Engineering, Sri Ramakrishna Mission Vidyalaya Polytechnic College, Coimbatore-641 020, T.N., IN

Abstract

This paper aims to focus on the possibility of using 10% of coconut shell aggregate (CSA) replaced for coarse aggregate in self compacting concrete (SCC) containing 25% fly ash (FA) prepared using additives of super plasticizer and viscosity modifying agent. The SCC with normal aggregate containing FA 25% is taken as (SCC), a reference and in the same mix, 10% of coconut shell aggregate is replaced for coarse aggregate. The fresh and hardened properties in both the SCC (M25) and SCC-CSA are studied in laboratory experiments. The possibility of potential use of coconut shell being one of the major agro-wastes in South India, as partial replacement of coarse aggregate in making a special concrete such as SCC-FA-CSA in structural component is verified and discussed. The research encourages potential use of the agro-waste known as CSA. It instantaneously reduces the consumption of normal natural stone aggregates apart from serving as a means of combining the CSA with abundantly available fly ash from thermal power stations and in turn help protect our mother earth and its environment by the precious minimised use of normal aggregate.

Keywords

Self Compacting Concrete, Fly Ash, Coconut Shell Aggregate, Solid Waste.

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R. Thangaraj ¹, R. Thenmozhi ²

Affiliations
1 Department of Civil Engineering, CMS College of Engineering and Technology, Coimbatore-641 032, T. N., IN
2 Department of Civil Engineering, Thanthai Periyar Govt. Institute of Technology, Vellore-638 002, T. N., IN

Abstract

A large number of structural properties of plain concrete are improved with addition of admixtures to concrete. It is well known that the addition of fly ash to plain concrete improves workability, strength, durability, less permeable and more stable. In conventional concrete the flexural strength reaches a maximum value between 14 and 28 days. In high volume fly ash (HVFA) concrete the strength keeps on increasing with age because of pozzolanic reaction of fly ash and strengthening of the interfacial bond between cement paste and aggregate. The use of fly ash as a partial replacement for Portland cement will usually reduce water demand and bleeding of HVFA concrete ranges from negligible to very low. Only few research works have been carried out earlier on flexural study on R C conventional beams without fly ash. Therefore in this investigation an attempt has been made to study any likely improvement on the effect of fly ash on the properties of HVFA concrete in R C beam elements with confinement of stirrups in compression zone. It has been suggested that the effective use of fly ash minimizes the disposal of fly ash, which also solves an environmental problem. This HVFA concrete is easy to pump, consolidate and finish the surface, free from cracks, reduces carbondioxide emissions, superior environmental friendliness, reduction in stone mining since it consumes less volume of Portland cement. The methodology adopted above improves ductility and improves the rotation capacity of the joints of framed structure, thus, improving the ultimate load carrying capacity. An attempt is also made to compare the load versus deflection of the HVFA concrete beams with conventional RCC beams and evaluated the performances of the proposed method of confinement. The results indicated that the confinement in the form of stirrups improves the ultimate strength and ductile behaviour of the concrete (IS 3812-1981). An attempt has been made in the present paper to highlight the utilization of fly ash in construction.

Keywords

Fly Ash, HVFA Concrete, Plasticizer, Structural Properties, Pozzaolanic Reaction.

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T. Senthil Vadivel ¹, R. Thenmozhi ²

Affiliations
1 Department of Civil Engineering, Erode Sengunthar Engineering College, Thudupathi, Erode-638 004, T. N., IN
2 Department of Civil Engineering, Government College of Technology, Coimbatore, T. N., IN

Abstract

In recent years waste handling and management is the primary issue faced by countries all over the world. It is very challenging and hectic problem that has to be tackled in an indigenous manner. On the basis of statistical data provided by the Environmental Protection Agency (EPA) 270,000,000 millions waste tyres are produced each year. The disposal of the waste tyres in landfills is a major issue handled by the local municipalities and government sectors. The statistical study gives an estimate that within the next decade the majority of the landfills used for the waste tyre disposal shall be closed and this poses the problem of need for lands for waste dumping. This new problem gave an idea of recycling of waste tyres instead of filling them in bare lands. Recycling of waste is a process adopted by any industry for efficient resource management. The discharge of waste tyres into expensive and the continuously decreasing numbers of landfills generates significant pressure to the local bodies identifying the potential application for these waste products. In this paper an experimental study is conducted to analyse the behaviour and failure characteristics of rubberized concrete where waste tyre rubber is partially replaced with coarse aggregate.

Keywords

Waste Tyre Rubber, Coarse Aggregate, Rubberized Concrete, Recycling of Waste.

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Sunilaa George , Jino John , P. N. Magudeswaran ¹, R. Thenmozhi ²

Affiliations
1 Department of Chemistry, VLB Jankiammal College of Engineering and Technology, Coimbatore, IN
2 Department of Civil Engineering, Govt. College of Technology, Coimbatore, T.N., IN

Abstract

River sand is widely used for concrete as fine aggregate. The increased cost of river sand and depletion in ground water table due to illegal sand mining leads to find an alternative for fine aggregate without compromising the strength. In this study, concrete mix M₃₀ has been designed using quarry dust and manufactured sand by replacing the river sand. Four mix proportions were made to test the effect of inclusion of quarry dust and manufactured sand in concrete and the results were compared with the control specimens. It was found that the strength of the concrete is enhanced in both the types of replacements.

Keywords

Manufactured Sand, River Sand, Quarry Dust, Cement Concrete.

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