Nature Environment and Pollution Technology

T. G. Ushaa ¹, R. Anuradha ², G. S. Venkatasubramani ³

Affiliations
1 Karpagam University, Coimbatore, Tamilnadu, IN
2 Department of Civil Engineering, SNS College of Technology, Coimbatore, Tamilnadu, IN
3 Paavai Engineering College, Rasipuram, Tamilnadu, IN

Abstract

The global warming is caused by emission of green house gases such as carbon dioxide and carbon monoxide into the atmosphere. The cement industry is held responsible for some of the carbon dioxide emissions, because the production of one tonne of Portland cement emits one tonne of carbon dioxide into the atmosphere. In terms of global warming the geopolymer technology could significantly reduce the carbon dioxide emission into the atmosphere caused by cement industries. This research is aimed to give awareness about the green house gas emissions from the cement manufacturing industries and the methods of reducing this by the use of fly ash and GGBFS. Two kinds of systems have been considered in this study, 100% replacement of cement by fly ash and 100% replacement of river sand by manufactured sand. The workability of Self Compacting Geopolymer Concrete (SCGC) for various molarities was investigated and fixed to 12M. The work focused on the concrete mixes with a fixed water-to-geopolymer solid (W/Gs) ratio of 0.33 by mass and a constant total binder content of 450 kg/m³. The workability related fresh properties for molarity of 12M of SCGC were assessed through slump flow, T_50cm slump flow, V-funnel, L-box and U-Box test methods. The mix proportions are arrived according to EFNARC (European Federation of National Associations Representing for Concrete) guidelines. Based on the results from workability and strength study, the results have been discussed for SCGC.

Keywords

Fly Ash, Self Compacting Geopolymer, Concrete (SCGC), Compressive Strength, Green House Gases.

Full Text

   

V. Sreevidya ¹, R. Anuradha ¹, R. Venkatasubramani ¹

Affiliations
1 Department of Civil Engineering, V.L.B Janakiammal College of Engineering and Technology Kovaipudur, Coimbatore-641 042, T. N., IN

Abstract

The climate change due to global warming, one of the greatest environmental issues, has become a major concern during the last decade. The global warming is caused by the emission of greenhouse gases such as CO₂ to the atmosphere by human activities. In recent years, attempts to increase the utilisation of fly ash to partially replace the use of Portland cement in concrete are gathering momentum. Geopolymer concrete is a new material that does not need the presence of Portland cement as a binder. Instead, activating the source materials such as fly ash that are rich in silicon (Si) and aluminium (Al) using high alkaline liquids produces the binder required to manufacture the concrete. Hence, concrete with no cement can be achieved. In this study M20 grade geopolymer concrete was designed and two trial mixes have been compared with the control specimen. This paper presents information on fly ash-based geopolymer concrete, material and the mixture proportions, the manufacturing process, and the influence of various parameters on the properties of fresh and hardened concrete.

Keywords

Fly Ash, Geopolymer Concrete, Superplasticizer, Global Warming.

Full Text