THE STUDY OF THE PROPERTIES OF FLY ASH BASED CONCRETE COMPOSITES WITH VARIOUS CHEMICAL ADMIXTURES

Document Type : Primary Research paper

Authors

Assistant Professor Department of Civil Engineering Nehru Institute of Technology

Abstract

Technological developments in our society are still highly extensive nature and the
forthcoming process of globalization affects the state of the environment significantly.
Along with a slight increase in population, uncontrolled pumping of raw materials for
production of materials and energy and urbanization of the environment, there is the
increase of harmful emissions and waste generation. Mineral resources are limited
considerably. The resources for feeding our growing population (the problem of
drinking water and food) are limited as well as materials needed for construction of
buildings, infrastructure development, and industry needed to ensure the people’s
welfare. This is also true for conventional raw materials for production of construction
materials and fuel. One of the main challenges of the 21st century is oriented on the
increasing effectiveness of the materials processing and significantly reduced energy
usage. Because concrete is the most used building material in the world, the new
approach consists in change in the design of concrete structures and in developing and
implementing new concrete processing technologies based on cement reduction
demand. Although new technologies are being developed to solve these problems, there
is a viable solution for the present time utilization of alternative raw materials i.e. fly
ash. The current annual worldwide production of by-products is estimated about 700
million tons of which 70 % is fly ash at least. Large quantities of fly ash are available at
low costs around the world and the use of fly ash concrete seems to offer the best
solution to reducing consumption of cement. The paper is aimed at the study of the
mechanical properties (tensile flexural and compressive strengths) of hardened fly ash -
concrete composites with various proportions of fly ash as well as the investigation of
the chemical admixtures influence on the concrete properties.

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