title: Experimental evaluation of sodium silicate-based nanosilica against chloride effects in offshore concrete.
abstract: This study investigates the effect of a new pore filling material, named sodium silicate-based nanosilica (SS), on resisting the diffusion of the chloride ions. The proposed SS is chosen, mainly due to its smaller particle size, compared to the conventional ethyl silicate-based nanosilica. Each particle of SS is chemically treated to have the negative (-) charge on its surface. Four types of mixes with different amounts of partial replacement with fly ash and slag are prepared. Effect of water to binder ratios (0.35, 0.40, and 0.45) is also examined. Test results showed that the inclusion of SS was significantly beneficial for protecting the concrete from chloride attack. At a given strength, the SS inclusion in concrete was up to three times more effective than the control concrete without SS. It is believed that these excellent results are attributed to the small particle size and the chemical surface treatment of SS. In this study, experiments of compressive strength, hydration heat, accelerated neutralization, and sulfate erosion tests were also conducted to find the general effect of SS inclusion on the fundamental properties and durability of concrete.
authors.affiliation: Architectural Technology Research Team, Daewoo Institute of Construction Technology, Suwon 440-800, Republic of Korea.
authors.forename: Kyoung-Min
authors.initials: KM
authors.lastname: Kim
authors.affiliation: Department of Architectural Engineering, Dankook University, Yongin 448-701, Republic of Korea.
authors.forename: Hak-Young
authors.initials: HY
authors.lastname: Kim
authors.affiliation: Fire Research Center, Korea Institute of Civil Engineering and Building Technology (KICT), Hwaseong 445-861, Republic of Korea.
authors.forename: Young-Sun
authors.initials: YS
authors.lastname: Heo
authors.affiliation: Department of Architectural Engineering, Dankook University, Yongin 448-701, Republic of Korea.
authors.forename: Sang-Jin
authors.initials: SJ
authors.lastname: Jung
mesh_terms: D002254:Carbonates / Q000737:chemistry; D002712:Chlorides / Q000737:chemistry*; D019245:Compressive Strength; D003252:Construction Materials; D004951:Esterification; D006358:Hot Temperature; D008970:Molecular Weight; D053758:Nanoparticles / Q000737:chemistry* / Q000648:ultrastructure; D017640:Silicates / Q000737:chemistry*; D012822:Silicon Dioxide / Q000737:chemistry*; D013431:Sulfates / Q000737:chemistry
chemical_list: D002254:Carbonates; D002712:Chlorides; D017640:Silicates; D013431:Sulfates; D012822:Silicon Dioxide; C005691:sodium silicate