Arce Andres, Azdejkovic Lazar, Miranda de Lima Luiz, Papanicolaou Catherine G, Triantafillou Thanasis C
Department of Civil Enginnering, University of Patras, Patras, West Greece, 26222, Greece.
Department of Materials and Environment, Delft University of Technology, Delft, 2628, The Netherlands.
Open Res Eur. 2022 Jun 17;2:79. doi: 10.12688/openreseurope.14674.1. eCollection 2022.
The need for repair and maintenance has become dominant in the European construction sector. This, combined with the urge to decrease CO emissions, has resulted in the development of lower carbon footprint repair solutions such as textile reinforced mortars (TRM) based on alkali-activated materials (AAM). Life cycle studies indicate that AAM CO savings, when compared to Portland cement, range from 80% to 30%. Furthermore, in this study, recycled aggregates were considered with the aim to promote a circular economy mindset. AAM mortars formulation based on fly ash, ladle furnace slag and metakaolin were tested for compressive and flexural strength. Three out of all formulations were chosen for an analysis on the potential of these mortars to be used for TRM applications. Tensile and shear bond tests, combined with a concrete substrate, were executed as indicators of the TRM effectiveness. Scanning electron microscopy and chemical analysis based on energy dispersive X-ray spectroscopy were used to interpret the results and reveal the reasons behind the different level of performance of these composites. Results indicated that TRM based on high calcium fly ash are unsuitable for structural strengthening applications due to low bond between matrix and/or substrate and fibers. Metakaolin-based TRM showed good performance both in terms of tensile strength and bond capacity, which suggests potential as a repair mortar.
在欧洲建筑行业，修复和维护需求已占据主导地位。这与减少二氧化碳排放的迫切需求相结合，促使了基于碱激活材料（AAM）的低碳足迹修复解决方案的发展，如纺织增强砂浆（TRM）。生命周期研究表明，与波特兰水泥相比，AAM可节省80%至30%的二氧化碳。此外，在本研究中，考虑使用再生骨料以促进循环经济理念。对基于粉煤灰、钢包精炼炉渣和偏高岭土的AAM砂浆配方进行了抗压强度和抗折强度测试。从所有配方中选取了三种，分析这些砂浆用于TRM应用的潜力。进行了拉伸和剪切粘结试验，并结合混凝土基材，作为TRM有效性的指标。使用扫描电子显微镜和基于能量色散X射线光谱的化学分析来解释结果，并揭示这些复合材料性能水平不同背后的原因。结果表明，基于高钙粉煤灰的TRM由于基体和/或基材与纤维之间的粘结力低，不适用于结构加固应用。基于偏高岭土的TRM在拉伸强度和粘结能力方面均表现出良好性能，这表明其作为修复砂浆具有潜力。
