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The role of waste products in increasing concrete strength and protecting against reinforcement corrosion
Corrosion of steel reinforcement is mainly due to the penetration of deleterious materials. Prevention methods should either eliminate this penetration, or render the reinforcement passive. Coating the steel reinforcement is the most widespread method for steel corrosion prevention. Steel surface coatings form a barrier or a membrane to prevent the flow of corrosion current to or from the steel surface. Coatings of cement contain paints with waterproofing admixtures; those of slurries of lime and cement with bone glue have also been recommended as anti-corrosive measures. Black liquor (or lye), a commercial by-product from the pulp and paper industry in Egypt, mainly composed of soda lignin, has been used as a water-reducing concrete mixture. It has been found that about 8 % of the mixing water has been reduced and a appreciable gain in compressive strength (reaching 30.6 % over control concrete) by admixing concrete with 0.2 % black liquor. A cement slurry admixed with 0.2 % black liquor undoubtedly forms an outstanding corrosion-resistant coating that efficiently suppresses the corrosion of steel reinforcement that can ensue due to the presence of aggressive ions admixed with the concrete or penetrating from outer media. Microsilica, a by-product of the silicon and ferrosilicon industries, has succeeded as a beneficial partial replacement (or additive) for Portland cement. A novel waste products' mix has been produced using black liquor and microsilica. As a concrete additive and/or as a steel coating, the mix forms an outstanding admixture, enhancing concrete strength and durability as well as effectively and efficiently suppressing corrosion of the steel reinforcement due to aggressive ions penetrating from the surrounding medium. The use of such a novel mix can ensure long-term durability and serviceability of concrete structures. Reinforcing steel coated with the novel mix embedded in mixed concrete shows significantly improved corrosion resistance against the aggressive media.
The role of waste products in increasing concrete strength and protecting against reinforcement corrosion
Corrosion of steel reinforcement is mainly due to the penetration of deleterious materials. Prevention methods should either eliminate this penetration, or render the reinforcement passive. Coating the steel reinforcement is the most widespread method for steel corrosion prevention. Steel surface coatings form a barrier or a membrane to prevent the flow of corrosion current to or from the steel surface. Coatings of cement contain paints with waterproofing admixtures; those of slurries of lime and cement with bone glue have also been recommended as anti-corrosive measures. Black liquor (or lye), a commercial by-product from the pulp and paper industry in Egypt, mainly composed of soda lignin, has been used as a water-reducing concrete mixture. It has been found that about 8 % of the mixing water has been reduced and a appreciable gain in compressive strength (reaching 30.6 % over control concrete) by admixing concrete with 0.2 % black liquor. A cement slurry admixed with 0.2 % black liquor undoubtedly forms an outstanding corrosion-resistant coating that efficiently suppresses the corrosion of steel reinforcement that can ensue due to the presence of aggressive ions admixed with the concrete or penetrating from outer media. Microsilica, a by-product of the silicon and ferrosilicon industries, has succeeded as a beneficial partial replacement (or additive) for Portland cement. A novel waste products' mix has been produced using black liquor and microsilica. As a concrete additive and/or as a steel coating, the mix forms an outstanding admixture, enhancing concrete strength and durability as well as effectively and efficiently suppressing corrosion of the steel reinforcement due to aggressive ions penetrating from the surrounding medium. The use of such a novel mix can ensure long-term durability and serviceability of concrete structures. Reinforcing steel coated with the novel mix embedded in mixed concrete shows significantly improved corrosion resistance against the aggressive media.
The role of waste products in increasing concrete strength and protecting against reinforcement corrosion
Die Rolle von Abfallprodukten zur Erhöhung der Betonfestigkeit und zum Schutz gegen Bewehrungskorrosion
Ali, A.H. (author) / El-Sabbagh, B. (author) / Hassan, H.M. (author)
Corrosion Prevention and Control ; 45 ; 173-180
1998
8 Seiten, 7 Bilder, 11 Quellen
Article (Journal)
English
Bewehrung , Betonstahl , Stahlbeton , Zusatzstoff , Beschichtung (Überzug) , nichtmetallischer Überzug , Abfallverwertung , Beiprodukt , Papierindustrie , Siliciumoxid , hydraulischer Zement , Tränken (Imprägnieren) , Permeabilität , Wasser , Magnesiumchlorid , Ammoniumchlorid , Natriumchlorid , Druckfestigkeit , Korrosionsversuch , potentiostatische Prüfung , anodische Polarisation , Korrosionsstrom , Korrosionsschutz , Industrieabfall
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