Runci Antonino, Serdar Marijana
Department of Materials, Faculty of Civil Engineering, University of Zagreb, 10000 Zagreb, Croatia.
Materials (Basel). 2020 Nov 20;13(22):5244. doi: 10.3390/ma13225244.
The low environmental impact and high long-term performance of products are becoming imperative for the sustainable development of the construction industry. Alkali-activated materials (AAMs) are one of the available low-embodied-carbon alternatives to Portland cement (OPC). For their application in the marine environment or where de-icing salts are used, it is of utmost importance to demonstrate their equal or better performance compared to OPC. The aim of this study was to compare the corrosion behaviour of the steel in AAMs based on different regionally available by-products with the behaviour of the steel in OPC. The by-products used were fly ash, slag, silica fume, and iron-silica fines. The corrosion process of each system was monitored by the corrosion potential and polarisation resistance during exposure to tap water and chloride solution over a period of almost one year. Certain AAMs showed a higher resistance to chloride penetration compared to OPC, which was attributed to the smaller number of capillary pores and higher gel phase precipitation. The same corrosion resistance compared to OPC was achieved with alkali-activated fly ash and alkali-activated slag mortars. The stability of the systems in tap water and chloride solution was confirmed by the visual assessment of the steel surface at the end of the test period.
产品的低环境影响和高长期性能对于建筑业的可持续发展变得至关重要。碱激活材料（AAMs）是波特兰水泥（OPC）可用的低碳替代品之一。对于它们在海洋环境或使用除冰盐的地方的应用，证明它们与OPC具有同等或更好的性能至关重要。本研究的目的是比较基于不同区域可用副产品的AAMs中钢的腐蚀行为与OPC中钢的腐蚀行为。所使用的副产品是粉煤灰、矿渣、硅灰和铁硅细粉。在将近一年的时间里，通过在自来水和氯化物溶液中暴露期间的腐蚀电位和极化电阻来监测每个系统的腐蚀过程。与OPC相比，某些AAMs对氯化物渗透表现出更高的抗性，这归因于较少的毛细孔数量和更高的凝胶相沉淀。碱激活粉煤灰和碱激活矿渣砂浆与OPC具有相同的耐腐蚀性。在试验期结束时通过对钢表面的目视评估证实了系统在自来水和氯化物溶液中的稳定性。
