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Study on durability of early age high performance concrete mixed with slag and fly ash

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Document pages: 11 pages

Abstract: The importance of concrete durability increases because RC (reinforced concrete) structures degrade due to aggressive environmental conditions, which affects the safety and availability of the structure. Reinforcement corrosion is the main cause of accidental damage of reinforced concrete structures. The main cause of corrosion initiation is the entry of chloride ions in the environment. Therefore, the quantitative evaluation of chloride diffusion is very important to obtain chloride diffusion coefficient and resistance to chloride invasion. In this survey, 15 mix proportions were prepared for HPC (high performance concrete) using fly ash and ground blast furnace SL, including 3 water binder ratios (0.37, 0.42 and 0.47) and 3 substitution rates (0, 30 and 50 )g. Chloride diffusion coefficient was measured under nonstationary condition. In order to evaluate the microstructure characteristics, porosity through MIP was also measured. The results of compressive strength, chloride diffusion, and porosity are compared with electrical charges. This paper deals with the results of the concrete samples exposed for only 2 months, but it is a part of the total test plan for 100 years. From the work, time-dependent diffusion coefficients in HPC and the key parameters for durability design are proposed.

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