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The capacity of phosphoaluminate cement mortar to protect steel from corrosion
PALC (phosphoaluminate cement) is a novel developed cementitious material. The capacity of protecting reinforcing bars from corrosion in PALC mortars was investigated by testing the relative polarization potential, permeability-resistance and the mass loss of steel bars embedded in mortars respectively. The corresponding mortars of type I PC (Portland cement) and SALC (sulphoaluminate cement) were employed as the controls. Pore size analysis and SEM-EDS (scanning electron microscopy - energy dispersive spectrometry) technique have been employed to understand the above behaviors. The results indicate that: (1) The chemical equivalence of steel bar eroded per minute (mx) in PALC mortar is 8.9x10-10 g which is about 32 % and 26 % lower than that in the mortars of SALC (1.3x10 -9 g) and PC (1.2x10-9 g) respectively. (2) The mass loss rate of 0.052 % of steel bar in PALC mortars exposed in sea water for 60-day is about one time lower than that in SALC mortar, the penetration depth of water in PALC mortar is about 18 % and 36 % lower than that in SALC and PC mortars respectively at 60 d hydration. (3) The intrinsic high performance of PALC enables mortars high permeability-resistance and maintaining high electric potential of steel, and the physicochemically intimate bounding at the interface between PALC paste and the steel bar are responsible for the high protecting capacity.
The capacity of phosphoaluminate cement mortar to protect steel from corrosion
PALC (phosphoaluminate cement) is a novel developed cementitious material. The capacity of protecting reinforcing bars from corrosion in PALC mortars was investigated by testing the relative polarization potential, permeability-resistance and the mass loss of steel bars embedded in mortars respectively. The corresponding mortars of type I PC (Portland cement) and SALC (sulphoaluminate cement) were employed as the controls. Pore size analysis and SEM-EDS (scanning electron microscopy - energy dispersive spectrometry) technique have been employed to understand the above behaviors. The results indicate that: (1) The chemical equivalence of steel bar eroded per minute (mx) in PALC mortar is 8.9x10-10 g which is about 32 % and 26 % lower than that in the mortars of SALC (1.3x10 -9 g) and PC (1.2x10-9 g) respectively. (2) The mass loss rate of 0.052 % of steel bar in PALC mortars exposed in sea water for 60-day is about one time lower than that in SALC mortar, the penetration depth of water in PALC mortar is about 18 % and 36 % lower than that in SALC and PC mortars respectively at 60 d hydration. (3) The intrinsic high performance of PALC enables mortars high permeability-resistance and maintaining high electric potential of steel, and the physicochemically intimate bounding at the interface between PALC paste and the steel bar are responsible for the high protecting capacity.
The capacity of phosphoaluminate cement mortar to protect steel from corrosion
Fähigkeit von Phosphoaluminat-Zementmörtel zum Korrosionsschutz von Stahl
Xing, Feng (author) / Ding, Zhu (author) / Li, Shiqun (author) / Hu, Jiashan (author)
Silicates Industriels ; 74 ; 27-31
2009
5 Seiten, 6 Bilder, 5 Tabellen, 6 Quellen
Article (Journal)
English
Aluminat , Phosphat , feste Lösung , Glasphase , Zementmörtel , Wasserabbinden von Zement , Probenpräparation , Stahlblock , Stahlkorrosion , Korrosionsschutz , atmosphärische Durchlässigkeit , Massenverringerung , elektrochemische Polarisation , elektrisches Potenzial , Portlandzement , Sulfoaluminat , künstliches Meerwasser , Porengröße , Vergleich (Werkstoff) , Grenzflächenadhäsion
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