Gomes Amauri Ernesto, Gachet Luisa A, Lintz Rosa Cristina C, de L N M Melo Mirian, Osório Wislei R
Institute of Mechanical Engineering, Federal University of Itajubá (IEM-UNIFEI), Itajubá 37500-903, MG, Brazil.
Faculdade de Tecnologia, FT, Campus I, Universidade de Campinas/UNICAMP, Limeira 13484-332, SP, Brazil.
Materials (Basel). 2024 Nov 22;17(23):5717. doi: 10.3390/ma17235717.
The aim of this investigation is to determine the effects of hooked-end steel fibers on both the fresh and hardened properties of modified self-compacting concretes (SCC). For this purpose, the steel fibers are associated with other residue contents (i.e., marble, granite, and rubber). These concatenated material contents constitute a novelty since no investigations are reported. It is found that with the increase in rubber content, a better ability to absorb energy is observed. This indicates that a good alternative to structural material is provided. Fresh properties are evaluated by using flow, T time, V-funnel, and J-ring methods. The mechanical behavior is evaluated in terms of compressive strength, tensile strength, static and dynamic modulus of elasticity, and damping ratio. Experimental results of the water absorption, porosity, and density are also attained. It is also found that an SCC mixture containing steel fiber, marble/granite residue, and rubber content is a potential mixture to be considered when designing in SCC associated with an improved damping ratio. Although the rubber content decreases the mechanical behavior and slump flow, the concatenated utilization of marble/granite residues and steel fiber contents provides a slight improvement in the damping result. An environmental benefit can also be associated since cement consumption is decreased with marble additions.
本研究的目的是确定弯钩端钢纤维对改性自密实混凝土（SCC）新拌性能和硬化性能的影响。为此，将钢纤维与其他残余物（即大理石、花岗岩和橡胶）混合使用。这些组合的材料成分构成了一种新方法，因为尚未见相关研究报道。研究发现，随着橡胶含量的增加，观察到更好的能量吸收能力。这表明提供了一种结构材料的良好替代品。通过流动度、T时间、V型漏斗和J环试验方法评估新拌性能。从抗压强度、抗拉强度、静态和动态弹性模量以及阻尼比方面评估力学性能。还获得了吸水、孔隙率和密度的试验结果。研究还发现，当设计具有改进阻尼比的自密实混凝土时，含有钢纤维、大理石/花岗岩残余物和橡胶成分的自密实混凝土混合物是一种值得考虑的潜在混合物。虽然橡胶含量会降低力学性能和坍落度，但大理石/花岗岩残余物和钢纤维成分的组合使用在阻尼效果上有轻微改善。由于添加大理石会减少水泥用量，因此还具有环境效益。
