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Durability of low-heat, ultra rapid-hardening, latex-modified polymer concrete
Bridge deck overlays must have superior water-proofing characteristics to fully protect the underlying slabs of pavement. In particular, they must afford protection against chloride released by deicing chemicals used in winter that can seriously damage concrete. Consequently, overlays must be of high-density. In addition, the concrete must be safe to drive on, durable for the long-term, and easy to maintain. The heavy vehicles and traffic flow damage the pavement surface and allow chloride to be washed into the interior of the slab by rain, causing corrosion ofthe steel rebars. To address the shortfalls of existing varieties of ultra rapid-hardening cement, which is becoming more popular for resurfacing bridge deck overlays, the authors evaluated the effects ofadding metakaoline andalatexpolymer to such concrete. The modified cement showed excellent durability, based on its permeability characteristics and resistance to abrasion, repeated freezing and thawing, and scaling, and may prove an effective long-term solution for resurfacing bridge deck overlays. The addition of the latex polymer led to a film membrane forming between the cement paste and the aggregate, which filled and occluded tiny pores in the concrete, thereby reducing its abrasion resistance, although its frictional capacity had been lowered by the low-heat ultra rapid-hardening cement itself. After 300 cycles of repeated freezing and thawing, the modified concrete retained 95.84% of its dynamic modulus of elasticity, as measured initially, compared to that of the latex-free control mix, which dropped to 88.30%. Both mixes remained in very good condition visually after 300 cycles. A visual evaluation of scaling resistance indicated that admixing ultra rapid-hardening cement with latex polymer produced a dense concrete, as already indicated by the chloride permeability test.
Durability of low-heat, ultra rapid-hardening, latex-modified polymer concrete
Bridge deck overlays must have superior water-proofing characteristics to fully protect the underlying slabs of pavement. In particular, they must afford protection against chloride released by deicing chemicals used in winter that can seriously damage concrete. Consequently, overlays must be of high-density. In addition, the concrete must be safe to drive on, durable for the long-term, and easy to maintain. The heavy vehicles and traffic flow damage the pavement surface and allow chloride to be washed into the interior of the slab by rain, causing corrosion ofthe steel rebars. To address the shortfalls of existing varieties of ultra rapid-hardening cement, which is becoming more popular for resurfacing bridge deck overlays, the authors evaluated the effects ofadding metakaoline andalatexpolymer to such concrete. The modified cement showed excellent durability, based on its permeability characteristics and resistance to abrasion, repeated freezing and thawing, and scaling, and may prove an effective long-term solution for resurfacing bridge deck overlays. The addition of the latex polymer led to a film membrane forming between the cement paste and the aggregate, which filled and occluded tiny pores in the concrete, thereby reducing its abrasion resistance, although its frictional capacity had been lowered by the low-heat ultra rapid-hardening cement itself. After 300 cycles of repeated freezing and thawing, the modified concrete retained 95.84% of its dynamic modulus of elasticity, as measured initially, compared to that of the latex-free control mix, which dropped to 88.30%. Both mixes remained in very good condition visually after 300 cycles. A visual evaluation of scaling resistance indicated that admixing ultra rapid-hardening cement with latex polymer produced a dense concrete, as already indicated by the chloride permeability test.
Durability of low-heat, ultra rapid-hardening, latex-modified polymer concrete
Dauerhaftgkeit eines bei niedriger Temperatur ultraschnell abbindenden, Latex-modifizierten Polymer-Betons
Won, Jong-Pil (author) / Kim, Jeong-Hoon (author) / Lee, Si-Won (author) / Park, Chan-Gi (author)
Progress in Rubber, Plastics and Recycling Technology ; 25 ; 91-102
2009
12 Seiten, 7 Bilder, 6 Tabellen, 13 Quellen
Article (Journal)
English
Straßenbau , Brückenbau , Straßendecke , faserverstärkter Beton , Latex , Zement , Erhärten (Zementabbinden) , Oberflächennachbearbeitung , Lebensdauer , Abriebfestigkeit , Frostempfindlichkeit , Porosität , Elastizitätsmodul , mechanische Permeabilität , Durchlässigkeitsprüfung , Chlorid , Korrosionsfestigkeit
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