IMPACT OF NANOSIZED SILICA ON THE PHYSICO-MECHANICAL PROPERTIES AND CORROSION PROTECTION OF CONCRETE

Authors

Elsayed Elnaggar, Department of Chemistry , Faculty of Science - Al - Azhar Unive rsit y, Cairo, EgyptFollow
Tarek Elsokkary, Housing and Building National Research Center, Raw Building Materials Technology and Processing Research Institute, Cairo, EgyptFollow
Mostafa Shohide, Housing and Building National Research Center, Raw Building Materials Technology and Processing Research Institute, Cairo, Egypt.Follow
Basil El - Sabbagh, Housing and Building National Research Center, Raw Building Materials Technology and Processing Research Institute, Cairo, Egypt

Corresponding Author

Shohide, Mostafa

Document Type

Original Article

Subject Areas

Chemistry

Keywords

Concrete; nanosilica; corrosion of reinforced concrete

Abstract

Nanomaterials have an important role for enhancingthe concrete properties and inhibition of rebar corrosion in reinforced concrete. Nanosilica (NS) is one of the most effective cementitious materials, which possess high pozzolanic nature. In this work, NS was added in mix design of concrete with different ratios as; 0, 0.5, 1, 1.5, 2and 2.5 % by weight of Portland cement. Physical, mechanical properties (workability, density) were determinedfor the fresh concrete samples. While, compressive strength andmicrostructural properties of the interfacial transition zone (ITZ) between cement pastes and aggregates of concrete were investigatedfor the hardened samples.As well as electrochemical measurements (open circuit potential and linear polarization) were done for the reinforced concrete samples. The results show that, concretes containing NS up to 2% have a higher compressive strength and a denser in interfacial transition zone (ITZ). Also, corrosion inhibition for reinforced concrete increased gradually by increasing NS addition up to 2%.

How to Cite This Article

Elnaggar, Elsayed; Elsokkary, Tarek; Shohide, Mostafa; and El - Sabbagh, Basil (2019) "IMPACT OF NANOSIZED SILICA ON THE PHYSICO-MECHANICAL PROPERTIES AND CORROSION PROTECTION OF CONCRETE," Al-Azhar Bulletin of Science: Vol. 30: Iss. 1, Article 18.
DOI: https://doi.org/10.21608/absb.2019.67893