Assessment of the Magnetic Field Influence on the Mechanical, Durability and Microstructural Properties of Concrete Containing Silica Fume

The present experimental research aims to evaluate the effect of applying directly magnetic flux densities of ۰.۵, ۰.۸ and ۱ Tesla (T) to fresh concrete specimens containing ۵ and ۱۰% silica fume (SF). Regarding this, compressive and flexural strengths tests were used to assess the mechanical properties of the concrete. Furthermore, durability, of concrete specimens exposed to magnetic fileds (MFs) was investigated using the electrical resistance and chloride ion penetration tests. In order to analyze the microstructure of concrete, scanning electron microscopy (SEM) images were taken from concrete specimens subjected to MFs. Finally, a method has been introduced to determine the flexural strength of concrete under the influence of MF, relying on its cylinder compressive strength. According to this study observations, optimal results were achieved through MF of ۱ T and ۱۰% SF replacement. Hence, applying MF of ۱ T to concrete specimens incorporating ۱۰% SF enhanced their compressive, flexural and electrical strengths by ۲۴, ۱۵ and ۱۸%, respectively. Following this, depth of chloride ions penetration was decreased by ۱۵%. The SEM analysis revealed that the microstructure of concrete exposed to MF becomes denser and less porous, supporting the mechanical and durability findings.

کلیدواژه ها:

Magnetic field ، Concrete ، Silica Fume ، Durability ، SEM