Estimation of GGBS and HVFA Strength Efficiencies in Concrete with Age
K. Suvarna Latha1, M V Seshagiri Rao2, Srinivasa Reddy. V3
1K.Suvarna latha, Department of Civil Engineering, JNTUH College of Engineering, Hyderabad, India.
2M.V. Seshagiri Rao, Department of Civil Engineering, JNTUH College of Engineering, Hyderabad, India.
3Srinivasa Reddy V, Department of Civil Engineering, JNTUH College of Engineering, Hyderabad, India.
Manuscript received on November 21, 2012. | Revised Manuscript received on December 07, 2012. | Manuscript published on December 30, 2012. | PP: 221-225 | Volume-2, Issue-2, December 2012. | Retrieval Number: B0904112212 /2012©BEIESP
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© The Authors. Blue Eyes Intelligence Engineering and Sciences Publication (BEIESP). This is an open access article under the CC BY-NC-ND license (http://creativecommons.org/licenses/by-nc-nd/4.0/)
Abstract: The utilization of supplementary cementitious materials is well accepted because of the several improvements possible in the concrete composites, and due to the overall economy. The present paper is an effort to quantify the strength of ground granulated blast furnace slag (GGBS) and high volume fly ash (HVFA) at the various replacement levels and evaluate their efficiencies in concrete. In recent years GGBS when replaced with cement has emerged as a major alternative to conventional concrete and has rapidly drawn the concrete industry attention due to its cement savings, energy savings, and cost savings, environmental and socio-economic benefits. The present study reports the results of an experimental study, conducted to evaluate the strengths and strength efficiency factors of hardened concrete, by partially replacing the cement by various percentages of ground granulated blast furnace slag and high volume fly ash for M20, M40 and M60 grades of concrete at different ages. The overall strength efficiency was found to be a combination of general efficiency factor, depending on the age and a percentage efficiency factor, depending upon the percentage of replacement. Here an effort is made towards a specific understanding of the efficiency of GGBS and HVFA in concrete, considering the strength to water cement ratio relations, age and percentage of replacement. The optimum GGBS and HVFA replacement as cementitious material is characterized by high compressive strength, low heat of hydration, resistance to chemical attack, better workability, and good durability and cost-effective. From this study it can be concluded that, since the grain size of GGBS is less than ordinary Portland cement, its strength at early ages is less but continues to gain strength over a long period.
Keywords: Bolomey’s strength relation, Cementing efficiency, Ground granulated blast furnace slag (GGBS), High volume fly ash (HVFA), strength efficiency factor.