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Fatigue durability test of mortars incorporating polyurethane foam wastes

机译：掺入聚氨酯泡沫废料的砂浆的疲劳耐久性测试

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摘要

The fatigue behavior of lightweight polyurethane foam waste cement mortars was analyzed, in which the sand is replaced by polyurethane waste in volumetric proportions of 50%, 60% and 75%. For this purpose, having calculated the static modulus of elasticity of the mortars, successive loading and unloading cycles under compression are performed. These tests confirm the fatigue capacity and structural properties of the mortars, aspects that are indicative of their long-term durability and suitability for use in masonry works. Two test phases were performed with increasing and variable loads of 20% and 90% of the breaking strain, reaching 300,000 cycles in the first phase and 525,000 in the second one. Both phases showed that the cement mortars with substitutions of up to 60% of sand by polyurethane foam waste were capable of withstanding loading and unloading cycles similar to the conditions of typical masonry mortars in construction works. The results underlined the long-term durability of these lightweight recycled materials. Their good fatigue behavior could be corroborated through the images taken by computerized axial tomography. No significant fractures were observed when comparing the sections before and after the loading cycles, which indicates that no structural collapse took place. (C) 2018 Elsevier Ltd. All rights reserved.
机译：分析了轻质聚氨酯泡沫废水泥砂浆的疲劳性能，其中沙子被体积分数分别为50％，60％和75％的聚氨酯废料代替。为此，在计算了砂浆的静态弹性模量之后，进行了压缩下的连续加载和卸载循环。这些测试证实了砂浆的疲劳强度和结构特性，这些方面表明了砂浆的长期耐久性和适用于砌体工程的适用性。进行了两个测试阶段，分别增加了20％和90％的断裂应变和可变载荷，第一阶段达到300,000次循环，第二阶段达到525,000次。两个阶段都表明，用聚氨酯泡沫废料替代高达60％的沙子的水泥砂浆能够承受与建筑工程中典型砖石砂浆条件相似的装卸周期。结果强调了这些轻质回收材料的长期耐用性。通过计算机轴向断层扫描所拍摄的图像可以证实其良好的疲劳性能。比较加载周期之前和之后的截面时，未观察到明显的裂缝，这表明未发生结构塌陷。 （C）2018 Elsevier Ltd.保留所有权利。

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