Structural Characteristics of High Volume Fly ash Concrete Subjected to Elevated Temperature
S. Vamshi Krishna and Dr. J. Rex
International Journal of Analytical, Experimental and Finite Element Analysis
Volume 10: Issue 3, August 2023, pp 68-76
Author's Information
Dr. J. Rex 2
Corresponding Author
2Department of Civil Engineering,Malla Reddy Engineering College, Hyderabad
rexdindigul@gmail.com
S. Vamshi Krishna1
1Department of Civil Engineering,Malla Reddy Engineering College, Hyderabad
Abstract:-
Fly ash is a mineral additive that is added to concrete to increase the material's strength and longevity. Fly-ash concrete lost its strength because of the chemical shift in the gel brought on by the high temperatures. The matrix bonding weakened as a result, which resulted in the loss of strength. Fly ash may be used in concrete in a variety of ways, including as an additive, a partial replacement for cement, a full or partial replacement for fine aggregates, or as an extra component that contributes to the development of a variety of various properties. The electricity, nuclear, and oil and gas industries are just a few of the many global businesses that often employ pozzolanic concrete. Additionally, pozzolanic concrete is used to build tunnels and bridges. These concrete slabs have been exposed to the elements for a long time, which has caused high temperatures to be created inside of them in addition to the usual danger of fire. Even though it is well known that concrete is a substance that does not readily catch fire, concrete that is exposed to very high temperatures nevertheless can sustain significant harm, including a full and total collapse. The compressive strength, split tensile strength, and modulus elasticity of fly ash concrete were examined at temperatures as high as 120 degrees Celsius. In the experiment, a mix ratio of 1:1.45:2.2:1.103 and a water-cement ratio of 0.5 by weight were used. Fly ash was used as a substitute for cement in a variety of ways throughout this experiment. The elastic modulus of the material, as well as its split tensile strength and compressive strength, were also studied. The replacement ratios were 30, 40, and 50%, depending on the quantity of cement utilized. The compressive strength, split tensile strength, and elastic modulus of each kind of fly-ash concrete were evaluated at a variety of temperatures and after a certain length of curing time (between 28 and 56 days). The test findings showed that the elastic modulus, compressive strength, and split tensile strength of concrete with up to 30% cement replacement were equivalent to those of reference concrete without fly ash. The performance of the control mixture was superior to that of concrete mixes that incorporated 30, 40, or 50% fly ash in lieu of cement in terms of compressive strength, split tensile strength, and elastic modulus. Regardless of how long ago the pairings were created, this was always the case. On the other side, a combination's efficacy will improve with time. The compressive strength of concrete mixes containing 30, 40, or 50% fly ash instead of cement is decreased by 11.4%, 30.1%, 28.9%, and 27.5%, respectively, at a temperature of 120 degrees Celsius when compared to concrete compositions without fly ash.Index Terms:-
Fly ash, Pozzolanic concrete, compressive strength, and split tensile strength, elastic modulus, temperatures.REFERENCES
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