Analysis of Chloride diffusivity in green concrete based on Fick’s second law

Document Type : Research Article

Authors

1 civil engineering department, Sirjan university of technology, Sirjan, Iran

2 Civil engineering department, Sirjan University of Technology, Sirjan, Iran

Abstract

The important factor that plays a significant role in preventing the entry of destructive elements into concrete is cementitious composition of concrete. Moreover, reuse of agricultural wastes in concrete which called green concrete can replace materials used in the manufacturing of concrete and also reduce the negative effects on the environment, such as reduction of waste disposal and CO2 emissions. In this study, green concrete was produced with ash of Horsetail plant and Rice Husk residues containing a large amount of silicon as an additive with 0, 5, 10, 15, 20 and 25%, replacing Portland cement in four different concrete mix designs. In order to investigate chloride penetration after concrete curing, the specimens were exposed to salinity levels of 0.7, 15 and 35 dS/m from one surface for 150 days with a 10 cm water head. In terms of concrete strength, the optimum percentage of plant ash was 15%. The results showed trend diffusion coefficient of conventional concrete > green concrete- Horse-tail ash> green concrete-rice husk ash. Thus, green concrete, in addition to the appropriate strength specifications and reduction of environmental problems, also has a major role in the reduction of chloride ion penetration into areas exposed to solutions containing chloride ions.

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