Wu Siyu, Park Sungwoo, Pyo Sukhoon
Department of Urban and Environmental Engineering, Ulsan National Institute of Science and Technology (UNIST), Ulsan 44919, Korea.
Materials (Basel). 2022 Jul 11;15(14):4821. doi: 10.3390/ma15144821.
The vibration-reducing ability of construction materials is generally described by the damping ratio of the materials. Previously, many studies on the damping ratio of concrete have been done, such as the addition of rubber, polymer, fiber, and recycled aggregates in the concrete. However, the application of these materials in construction is limited due to their drawbacks. This paper investigated the effect of the replacement ratio and the size of the hollow glass microspheres (HGM), cenospheres (CS), and graphite flakes (GF) on the damping ratio of mortar. Furthermore, rubber particles (RP), aluminum powder (AP), and natural fiber (NF) were investigated to find if they have a combination effect with HGM. The half-power bandwidth method was conducted to obtain the damping ratio at 28 days of curing, and the compressive and flexural strength tests were also conducted to study the mechanical properties of mortar that contained HGM, CS, and GF. The results show that increases in the size of HGM and the replacement ratio of sand with HGM lead to an increase in the damping ratio. Moreover, RP and NF do not provide a combination effect with HGM on the damping ratio, whereas the application of AP results in a drastic compressive strength decrease even with an increase in damping ratio when incorporated with HGM. Besides, an increase in the replacement percentage of CS also leads to an improvement in the damping ratio, and a smaller size and higher replacement ratio of GFs can improve the damping ratio compared to other additives. As a result, CS and GF are more effective than HGM. 50% replacement ratio of CS slightly reduced the compressive strength by 6.4 MPa while improving the damping ratio by 15%, and 10% replacement ratio of samller GF can enhance the flexural strength by over 4.55% while increasing the damping ratio by 20.83%.
建筑材料的减振能力通常用材料的阻尼比来描述。此前，已经对混凝土的阻尼比进行了许多研究，例如在混凝土中添加橡胶、聚合物、纤维和再生骨料。然而，由于这些材料存在缺点，它们在建筑中的应用受到限制。本文研究了空心玻璃微珠（HGM）、漂珠（CS）和石墨片（GF）的替代率和尺寸对砂浆阻尼比的影响。此外，还研究了橡胶颗粒（RP）、铝粉（AP）和天然纤维（NF），以确定它们与HGM是否具有组合效应。采用半功率带宽法获得养护28天时的阻尼比，并进行抗压和抗折强度试验，以研究含有HGM、CS和GF的砂浆的力学性能。结果表明，HGM尺寸的增加以及用HGM替代砂的替代率的提高会导致阻尼比增加。此外，RP和NF与HGM在阻尼比方面没有组合效应，而AP的应用即使在与HGM混合时阻尼比增加，也会导致抗压强度急剧下降。此外，CS替代率的增加也会导致阻尼比的提高，与其他添加剂相比，较小尺寸和较高替代率的GF可以提高阻尼比。因此，CS和GF比HGM更有效。CS 50%的替代率在提高阻尼比15%的同时，抗压强度略有降低6.4MPa，较小GF 10%的替代率在增加阻尼比20.8%的同时，抗折强度可提高4.55%以上。
