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. Dharmaraj ¹, G. Iyappan ²

Affiliations
1 Department of Civil Engineering, University College of Engineering Panruti, Cuddalore - 607106, Tamil Nadu, IN
2 Department of Civil Engineering, Star Line College of Engineering and Technology, Thanjavur - 614206, IN

Abstract

Objectives: Disposal of plastic was a major problem in the present era, as the usage of plastics was growing day by day and it takes hundreds of year for plastic material to degrade. The effective ways to recycle and reuse of plastics are being formulated. Methods: Low Density Polyethylene (LDPE) Bags was taken into consideration as it was easily available and had low density than other type. The used plastic bags were collected, ground in to smaller components. Melted and pulverized in order to get granules of plastic of about 1 mm size. The density of the pulverized was found to be 920 Kg/m³ and its specific gravity was 0.89. Seive analysis were carried out and about 95% of the plastic bags were found to be in the range of 1-1.15 mm. 45 Nos of 100 × 100 × 100 mm cement concrete cubes of M20 mix were cast for 0%, 5%, 10%, 15% and 20% fine aggregate being replaced with pulverized plastic material. Volumetric proportioning was adopted instead of design mix since the low density of plastic bags material was too low. Workability test, mechanical properties were determined. Findings: The test results revealed that the compression strength of concrete at 28th days of conventional concrete is 23.56 N/mm². By partial replacement of 5% of Burned LDPE bags in concrete the 28th days increased by about 0.36 N/mm² when compared to conventional concrete. By partial replacement of 10% of burned LDPE bags in concrete the 28th days increased by about 1.02 N/mm² when compared to conventional concrete. By partial replacement of 15% of burned LDPE bags in concrete at 28th day increased by about 2.27 N/mm² for when compared to conventional concrete. By partial replacement of 20% of Burned LDPE bags in concrete the 28th days increased by about 1.16 N/mm² when compared to conventional concrete. Thus it is inferred that partial replacement of Burned LDPE bags up to 15% can be adopted. Novelty/Improvement: It is thereby suggested that utilization of this Low Density Polyethylene (LDPE) bags in concrete will reduce the requirement for convectional fine aggregate thereby resulting in conservation of natural resources.

Keywords

Low Density Polyethylene (LDPE), Fresh Concrete, Mechanical Properties Pulverized Plastic Concrete, Replacement of Fine aggregate

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