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首頁> 外文會議>Associazione Italiana Di Metallurgia;Dechema;Annual event of the European Federation of Corrosion on European Corrosion Congress;uropean Federation of Corrosion >Geopolymeric and cementitious mortars with the same strength class: comparison of the corrosion behaviour of embedded steel and galvanized steel reinforcements
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Geopolymeric and cementitious mortars with the same strength class: comparison of the corrosion behaviour of embedded steel and galvanized steel reinforcements

機譯：強度等級相同的地聚合物和水泥砂漿：嵌入式鋼和鍍鋅鋼增強件的腐蝕性能比較

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Geopolymeric and cementitious mortars with the same strength class and workabilityrnwere studied and compared in terms of mechanical and corrosion behaviour of possiblernreinforcements. To this aim, three different geopolymeric and cement mixturesrnwere manufactured in order to obtain mortars belonging to R1≥10MPa, R2≥15MParnand R3≥25 MPa strength class.rnIn particular, mortars based on geopolymer binder were prepared with fly ash, calciumrnaluminate cement, a solution of sodium silicate/potassium hydroxide ratio ofrn0.85:1, with different concentration of KOH, and a sand/binder ratio of 2.7:1, byrnweight. The respective three cementitious mortar mixtures were prepared with differentrnproportions of ordinary Portland cement and hydraulic lime as binders, differentrnwater/binder ratio by weight and the same sand/binder ratio (3:1 by weight).rnThe corrosion resistance of steel and galvanized steel reinforcements was investigatedrnby free corrosion potential and polarization resistance measurements. Finally,rnmetallographic analysis on the cross sections of galvanized bars extracted from thernspecimens was also carried out.rnThe results showed that, initially, the galvanized steel reinforcements are particularlyrnsusceptible to corrosion in geopolymeric mixtures due to their high alkalinity. However,rnafter few days of curing, the corrosion rate decrease, even if this process is slowerrnthan that of same reinforcements in cementitious mixtures. On the other hand, inrngeopolymeric matrix, the steel reinforcements show a lower corrosion rate, if comparedrnwith galvanized steel reinforcements, and their corrosion behaviour do notrnchange significantly with the type of binder.
機譯：研究并比較了具有相同強度等級和可加工性的地聚合物砂漿和水泥砂漿的可能的鋼筋的機械性能和腐蝕性能。為此，制造了三種不同的地聚合物和水泥混合物，以獲得強度等級為R1≥10MPa，R2≥15MParn和R3≥25MPa的砂漿。特別是，用粉煤灰，鋁酸鈣水泥，硅酸鈉/氫氧化鉀溶液的重量比為0.85：1，KOH濃度不同，砂/粘結(jié)劑的比率為2.7：1。分別使用三種比例的普通硅酸鹽水泥和水硬性石灰作為粘合劑，不同的水/粘結(jié)劑重量比和相同的砂/粘結(jié)劑比率（3：1重量）制備三種水泥砂漿混合物。鋼和鍍鋅鋼筋的耐腐蝕性通過自由腐蝕電位和極化電阻測量來研究。最后，對從試樣中提取的鍍鋅鋼筋的橫截面進行了金相分析。結(jié)果表明，起初，鍍鋅鋼筋由于其高堿度而特別容易受到地質(zhì)聚合物混合物的腐蝕。但是，固化幾天后，即使該過程比水泥混合物中相同的增強材料的腐蝕過程慢，腐蝕速率也會降低。另一方面，在非地基聚合物基體中，與鍍鋅鋼增強材料相比，鋼增強材料顯示出較低的腐蝕速率，并且其腐蝕行為不會隨粘合劑類型的變化而顯著變化。

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