Geopolymer from Metakaolin containing Field Para Rubber Latex Coating for Protecting Reinforced Concrete against Corrosion
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Abstract
In this study, geopolymers were synthesized from metakaolin containing field Para rubber latex and activated with sodium silicate and sodium hydroxide. The concrete samples were coated with these geopolymers to assess their corrosion resistance. Geopolymers were prepared by substituting metakaolin with field Para rubber latex at weight percentages of 1%, 3%, 5%, and 10%. The concrete specimens were coated with single or double layers of the geopolymers and then cured for 24 hours. Tensile strength and corrosion performance of the steel were evaluated through an accelerated corrosion test with a 12-volt electric current, applied for 8 hours and paused for 8 hours, over a duration of 14 days. Additionally, samples submerged in seawater were tested. The results demonstrated that the samples coated with geopolymers containing 1%, 3%, and 5% natural rubber latex by weight exhibited a significant reduction in corrosion, evident in both single and double-coated specimens. Structural analysis at the micro level was also conducted at the interfacial transition zone between concrete and geopolymers paste.
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