Andres Arce, Panagiotis Kapsalis, C. Papanicolaou, T. C. Triantafillou
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引用次数: 0
摘要
本文讨论了如何将一种基于工业废料的碱活性砂浆(AAM)整合到一种新型复合材料中,这种材料适用于结构升级,具有耐高温和二氧化碳排放量低的特点。碱活性砂浆与碳纤维纺织品相结合,形成了新一代可持续无机基复合材料--纺织品增强碱活性砂浆(TRAAM)。我们设计了一个测试程序,以评估碳纤维 TRAAM 覆盖层在提高砌体墙试样抗剪能力方面的有效性,该试样由实心粘土砖组成,粘结有石灰基砂浆,两面都有 TRAAM 护套。我们评估了加固墙体的初始承载力和剩余承载力,后者是通过在暴露于 300 °C 和 550 °C 温度后进行对角压缩试验来实现的。结果表明,当使用单层或双层织物时,TRAAM 护套可将未烧制砌体墙的抗剪能力分别提高 260% 和 335%。快速加热至 550 °C、一小时稳态加热和自然冷却都不会在试样上产生明显的热裂缝,对其剩余承载力的影响也很小。基于这些结果,将 TRAAM 用于耐火结构改造的前景似乎非常乐观。
Diagonal Compression Tests on Unfired and Fired Masonry Wallettes Retrofitted with Textile-Reinforced Alkali-Activated Mortar
This paper discusses the integration of an alkali-activated mortar (AAM), based on industrial waste, into a novel composite material fit for structural upgrading purposes and rendered with high temperature endurance and a low CO2 footprint. The AAM combined with carbon fiber textiles form a new generation of sustainable inorganic matrix composites—that of textile-reinforced alkali-activated mortars (TRAAM). A test program was designed to assess the effectiveness of carbon TRAAM overlays in increasing the shear capacity of masonry wall specimens comprising solid clay bricks bonded with lime-based mortar and furnished with TRAAM jackets on both sides. The initial and the residual capacity of the reinforced walls were evaluated, the latter by performing diagonal compression tests after exposure to 300 °C and 550 °C. It was shown that TRAAM jacketing can increase the shear capacity of unfired masonry walls by 260% and 335% when a single or a double layer of textile is used, respectively. Rapid heating to temperatures up to 550 °C, one-hour-long steady-state heating, and natural cooling bore no visible thermal cracks on the specimens and had little effect on their residual capacity. Based on these results, the prospect of using TRAAM for retrofitting applications for fire-resilient structures seems very auspicious.