Abstract
This paper describes a study carried out to determine the application of fly ash (FA) and ground granulated blast furnace slag (SG) for the purpose of enhanced mechanical properties and chemical resistance of antiwashout underwater concrete (AWC). As a result of experiments, mechanical properties, suspended solids and pH value all satisfied the ‘Standard Specification of Antiwashout Admixtures for Concrete’ prescribed by KSCE (Korean Society of Civil Engineers). Slump flow, efflux time and elevation of head were all improved with respect to the control concrete. For the immersion test, ×2 artificial seawater, 5% sulphuric acid solution, 10% sodium sulfate solution and 10 % calcium chloride solution were used and at all test ages, compressive strength and mass variation were determined. At 91 days of immersion, XRD analysis was carried out to investigate the reactants between cement hydrates and chemical ions and some crystalline elements such as gypsum, ettringite and Fridel's salt were found. INTRODUCTION MATERIALS AND EXPERIMENTAL DETAILS RESULTS AND DISCUSSION CONCLUSIONS REFERENCES
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