Abstract
A large amount of industrial and agro wastes mostly end up in landfills and not much attention is given to these wastes, which cause environmental problems. Few of the industrial and agro by-products such as fly ash, sugar cane bagasse ash and silica fume act as pozzolanic materials in preparation of blended cements which provide satisfactory alternative results in waste management. The main goal of this research is to check the durability properties of carbon dioxide cured sugar cane bagasse ash concrete when exposed to marine environments. A set of different concrete mixes were prepared by partially replacing the cement with various percentages of sugarcane bagasse ash (0%, 5%, 15%, 25%) and 10% of silica fume in each mix and then these specimens were cured in water for 28 days, in CO2 gas for 8 hours and in dry ice for 8 hours. After curing, these specimens are exposed to seawater for a period of 28 days, 90 days and 120 days, and then tests are conducted for compressive, tensile, and flexural strength. The test results indicate that replacement of cement with 5% bagasse ash & 10% silica fume showed better effective results when compared to all other percentages of replacements. The specimens cured in CO2 gas showed similar results as that of water cured specimens while the specimens cured with dry ice showed a loss in strength.
Highlights
Reducing the usage of natural resources by partially replacing cement with different pozzolanic material such as silica fume, sugar cane bagasse ash, and replacing water with carbon dioxide for curing, it was found that 80% of strength was achieved for 8hrs of CO2 curing compared with 28 days water curing specimen [1]
Durability properties have studied for recycled aggregate concrete specimens cured with carbon dioxide, it was shown that compressive strength at 72 hrs of CO2 cured concrete was similar to 90 days water curing and split tensile strength showed higher results compared to 90 days water cured results, higher chloride penetration resistance was observed [2]
Studied the fluence of sea water, sea sand for curing and mixing for concrete and it was found that there is a slight increase in compressive strength of concrete mixed with fresh water and cured in sea water at 90 days of curing and no change was observed in tensile strength of concrete, and there is a decrease in flexural strength of concrete was observed [10]
Summary
Reducing the usage of natural resources by partially replacing cement with different pozzolanic material such as silica fume, sugar cane bagasse ash, and replacing water with carbon dioxide for curing, it was found that 80% of strength was achieved for 8hrs of CO2 curing compared with 28 days water curing specimen [1]. Durability properties have studied for recycled aggregate concrete specimens cured with carbon dioxide, it was shown that compressive strength at 72 hrs of CO2 cured concrete was similar to 90 days water curing and split tensile strength showed higher results compared to 90 days water cured results, higher chloride penetration resistance was observed [2]. Green concrete using aggro waste [SCBA] for a water-cement ratio of 0.42 showed that at 15% of replacement the strength of concrete showed best results at 28 days of curing compared to other percentages (5%,10%,20%,25%), at 28 days of curing for 20%,25% replacement samples showed less split tensile strength [5], [7]. Types of aggregate affect the concrete volume and the water permeability of concrete [13]
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