Han Chenyue, Pang Jianyong, Hu Shi, Yang Chunchun
School of Civil Engineering and Architecture, Anhui University of Science and Technology, Huainan, 232001, PR China.
Department of Structural Engineering, College of Civil Engineering, Tongji University, Shanghai, 200092, PR China.
Sci Rep. 2024 May 31;14(1):12573. doi: 10.1038/s41598-024-63341-z.
Through tests and micro-observations, the static and dynamic mechanical properties and microstructure of rubber concrete samples modified with varying amounts of silica fume and polypropylene fiber content were explored. The results indicate that incorporation of silica fume and polypropylene fiber can effectively enhance the performance of rubber concrete. Moreover, at 10% and 0.1% of silica fume and polypropylene fiber content respectively, rubber concrete's compressive strength, splitting tensile strength, flexural strength, and dynamic compressive strength reached maxima. Furthermore, microstructure characteristic analysis indicated that inadequate adhesion between rubber particles and the matrix is responsible for compromised bearing capacity in unmodified rubber concrete. However, with the addition of silica fume and polypropylene fiber, the fiber binds the rubber particles closely with the matrix, while the silica fume fills the gaps between the matrix components. This combination results in rubber concrete with a denser internal structure and enhances its bearing capacity significantly.
通过试验和微观观测，探究了不同硅灰掺量和聚丙烯纤维含量改性的橡胶混凝土试件的静态和动态力学性能及微观结构。结果表明，掺入硅灰和聚丙烯纤维可有效提高橡胶混凝土的性能。此外，当硅灰和聚丙烯纤维含量分别为10%和0.1%时，橡胶混凝土的抗压强度、劈裂抗拉强度、抗折强度和动态抗压强度达到最大值。此外，微观结构特征分析表明，未改性橡胶混凝土中橡胶颗粒与基体之间的粘结不足导致其承载能力受损。然而，随着硅灰和聚丙烯纤维的加入，纤维将橡胶颗粒与基体紧密结合，而硅灰填充了基体组分之间的间隙。这种组合使得橡胶混凝土内部结构更致密，并显著提高了其承载能力。
