Torres-Acosta Andrés A, González-Calderón Paola Y
School of Engineering and Science, Tecnologico de Monterrey, Santiago de Querétaro 76130, Mexico.
CH Arquitectura y Construcción, 15A Avenida Sur, Centro, Cozumel 77710, Mexico.
Materials (Basel). 2021 Mar 9;14(5):1316. doi: 10.3390/ma14051316.
The present investigation is directed to determine if a natural/botanical addition, from Opuntia ficus-indica (OFI) cactus, increases durability for cement-based materials exposed to CO-laden environments (urban and industrial). The use of this botanical addition in cement-based material applications has shown good performance when these materials are exposed to chloride-laden environments, but no investigations to date have shown the performance of this addition in urban/industrial environments. Therefore, the aim of this investigation is to complement OFI mucilage performance in the most hazardous environments where most of these construction materials are naturally exposed: marine, urban, and industrial. Steel-reinforced mortar prisms, containing OFI mucilage at different addition levels (0%, 1.5%, 4%, 8%, 42%, and 95%, by water mass replacement concentration), were exposed for 14 years (5110 days) in a natural CO-laden environment. Linear polarization resistance measurements were performed in a wet-dry cycle (between 5020 and 5110 days of age, after mortar fabrication) to determine the possible corrosion-inhibiting effect of OFI mucilage additions. Little corrosion-induced cracking was observed in carbonated mortars with OFI mucilage additions, compared with the carbonated control mortar that showed high corrosion-induced cracking. The electrochemical results showed corrosion-inhibiting efficiencies for steel in carbonated mortar with OFI mucilage additions of 40-70% for low OFI mucilage concentrations (1.5% and 4%), and 70-90% for medium and high OFI mucilage concentrations (8%, 42%, and 95%). Experimental findings suggest that adding OFI mucilage might be useful as a corrosion inhibitor for steel in carbonated cement-based materials (i.e., mortar) because corrosion rates and cracking initiation/propagation were decreased.
本研究旨在确定来自仙人掌（OFI）的天然/植物添加物是否能提高暴露于含CO环境（城市和工业环境）中的水泥基材料的耐久性。当这些材料暴露于含氯环境时，在水泥基材料应用中使用这种植物添加物已显示出良好的性能，但迄今为止，尚无研究表明这种添加物在城市/工业环境中的性能。因此，本研究的目的是补充OFI黏液在这些建筑材料自然暴露的最危险环境（海洋、城市和工业环境）中的性能。含有不同添加水平（按水质置换浓度计为0%、1.5%、4%、8%、42%和95%）OFI黏液的钢筋砂浆棱柱体在天然含CO环境中暴露14年（5110天）。在湿干循环过程中（在砂浆制成后5020至5110天龄期之间）进行线性极化电阻测量，以确定OFI黏液添加物可能的缓蚀效果。与显示出高腐蚀诱导开裂的碳酸化对照砂浆相比，在添加OFI黏液的碳酸化砂浆中观察到的腐蚀诱导开裂较少。电化学结果表明，对于低OFI黏液浓度（1.5%和4%），添加OFI黏液的碳酸化砂浆中钢的缓蚀效率为40 - 70%，对于中高OFI黏液浓度（8%、42%和95%），缓蚀效率为70 - 90%。实验结果表明，添加OFI黏液可能作为碳酸化水泥基材料（即砂浆）中钢的缓蚀剂是有用的，因为腐蚀速率和开裂的起始/扩展都降低了。
