Economy of Using Fly Ash in Concrete
ABSTRACT
Fly Ash is a supplementary cementitious material (because of its pozzolanic character) for cement concrete. It is widely available and technically highly useful product. The cement contents, Fly Ash Concrete are more durable; actually durability level of Fly Ash Concretes can not de achieved in cement concretes. These aspects, besides, various benefits of usage of fly ash in cement concrete are discussed in this paper. It is concluded, based on the available information, that there is no need for any apprehension for use of fly ash and the Fly Ash Concretes are more eco-friendly and hence ‘greener’, due to their reduced energy contents, higher efficient use of Portland cement, lower cost per unit volume, and longer period of service life.
1.0. INTRODUCTION
The current rapid development in India has created a large demand for construction for years to come, requiring increased production of cast-in-place concrete and concrete products. These will be essential to major infrastructure construction projects such as transportation (roads, bridges, airports), water distribution (embankments and water channels), energy development (nuclear power generation), and for buildings in general. Typically, conventional concrete is made of fine and coarse aggregates, water, Portland cement and chemical admixtures. Portland cement based composites have high potential for strength which are not utilized gainfully in the actual practice. Moreover, it has been conceded that the concrete is the largest man-made material of construction. To make the concrete more eco-friendly, its energy content should be reduced, its long-term durability superior and the ingredients environment-friendly. Therefore, it is essential to introduce new technologies and practices for alternative cement and concrete compositions in order to curtail the rising environmental problems caused by increased Portland cement production. Furthermore, these new technologies will slow down the depletion of
Fly Ash is a supplementary cementitious material (because of its pozzolanic character) for cement concrete. It is widely available and technically highly useful product. The cement contents, Fly Ash Concrete are more durable; actually durability level of Fly Ash Concretes can not de achieved in cement concretes. These aspects, besides, various benefits of usage of fly ash in cement concrete are discussed in this paper. It is concluded, based on the available information, that there is no need for any apprehension for use of fly ash and the Fly Ash Concretes are more eco-friendly and hence ‘greener’, due to their reduced energy contents, higher efficient use of Portland cement, lower cost per unit volume, and longer period of service life.
1.0. INTRODUCTION
The current rapid development in India has created a large demand for construction for years to come, requiring increased production of cast-in-place concrete and concrete products. These will be essential to major infrastructure construction projects such as transportation (roads, bridges, airports), water distribution (embankments and water channels), energy development (nuclear power generation), and for buildings in general. Typically, conventional concrete is made of fine and coarse aggregates, water, Portland cement and chemical admixtures. Portland cement based composites have high potential for strength which are not utilized gainfully in the actual practice. Moreover, it has been conceded that the concrete is the largest man-made material of construction. To make the concrete more eco-friendly, its energy content should be reduced, its long-term durability superior and the ingredients environment-friendly. Therefore, it is essential to introduce new technologies and practices for alternative cement and concrete compositions in order to curtail the rising environmental problems caused by increased Portland cement production. Furthermore, these new technologies will slow down the depletion of
References: 1. Annie J Peter, M. Neelamegam, J. K. Dattatreya, N. P. Rajamane and S. Gopalakrishnan, [Feb,1998], Utilisation of Fly ash as Cement Replacement Material to Produce High Performance Concrete, Proceeding of the National Seminar on Fly ash Utilisation for Metallurgical Laboratory, Jamshedpur, India. 2. BIS, Handbook on Concrete Mixes (Based on Indian Standards), Bureau of Indian Standards (BIS) Value Added Products, New Delhi. 3. Gopalakrishnan, S., Rajamane, N. P., Dattatreya, J. K., Neelamegam, M, and Annie Peter, J, [May, 2001], Effect of partial replacement of cement with fly ash on the strength and durability of HPC, The Indian Concrete Journal. 4. N. P. Rajamane, Scientist, Making Concrete 'Green ' Through Use of Fly Ash, Concrete Composites Laboratory Structural Engineering Research Centre, CSIR,Chennai.