Service Life Prediction of High Performance Concrete Incorporated with GGBS and Silica Fume
Ch. Hema Durga Rajeswari1, B. Kameswara Rao2

1Ch. Hema Durga Rajeswari, Post Graduate Student, Department of Civil Engineering, Koneru Lakshmaiah Education Foundation, Vaddeswaram, Guntur (A.P), India.
2B. Kameswara Rao, Professor, Department of Civil Engineering, Koneru Lakshmaiah Education Foundation, Vaddeswaram, Guntur (A.P), India.
Manuscript received on 02 May 2019 | Revised Manuscript received on 14 May 2019 | Manuscript Published on 28 May 2019 | PP: 448-455 | Volume-7 Issue-6C2 April 2019 | Retrieval Number: F10810476C219/2019©BEIESP
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Abstract: As known that, every structure has an estimated life span. Due to various problems, the life span of structures gradually decreases due to the passage of time. One of the major problems is corrosion of reinforcement as we all facing now a days. Corrosion mainly occurs due to penetration of chloride ions. By partially replacing of Ground granulated blast furnace slag (GGBS) with different percentages (50%, 60%, 70%, 80%, 90%) and by adding 5% of silica fume to the cement results in the reduction of heat of hydration, as well as leads to high strength, high durability, corrosion resistance and pore reducing capacity in the structures. It is mostly useful for durability point of view when concrete is exposed to marine conditions, etc. The experiment is conducted by replacing cement with GGBS on different mixes of similar workability with three water binding ratios of 0.3, 0.4 and 0.5. For this research, around 72 cubes of standard size (150mm X 150mm X 150mm) were tested for compressive strengths which is for both plain concrete and different slag replacements in concrete at the ages of 28 days, 56 days and 90 days. For CPT test, around 48 cubes were cast in determining chloride penetration. The specimens were immersed in 3.5% of sodium chloride solution by weight of water and then left for curing for 28 days, 56 days and 90days and then drill the specimens to certain depths of for chemical analysis. The amount of penetration is checked and the chloride impact is estimated on the concrete, which helps in estimation of life of concrete. Hence, the results were concluded by chemical results.
Keywords: Chloride Penetration, Corrosion, Durability, GGBS, Service Life Prediction, Silica Fume and Water-Cement Ratio.
Scope of the Article: High Performance Concrete