Nam Jeongsoo, Kim Gyuyong, Yoo Jaechul, Choe Gyeongcheol, Kim Hongseop, Choi Hyeonggil, Kim Youngduck
Structure Engineering Research Center, Tokyo Institute of Technology, Yokohama 226-8503, Japan.
Department of Architectural Engineering, Chungnam National University, Daejeon 34134, Korea.
Materials (Basel). 2016 Feb 26;9(3):131. doi: 10.3390/ma9030131.
This paper presents an experimental study conducted to investigate the effect of fiber reinforcement on the mechanical properties and shrinkage cracking of recycled fine aggregate concrete (RFAC) with two types of fiber-polyvinyl alcohol (PVA) and nylon. A small fiber volume fraction, such as 0.05% or 0.1%, in RFAC with polyvinyl alcohol or nylon fibers was used for optimum efficiency in minimum quantity. Additionally, to make a comparative evaluation of the mechanical properties and shrinkage cracking, we examined natural fine aggregate concrete as well. The test results revealed that the addition of fibers and fine aggregates plays an important role in improving the mechanical performance of the investigated concrete specimens as well as controlling their cracking behavior. The mechanical properties such as compressive strength, splitting tensile strength, and flexural strength of fiber-reinforced RFAC were slightly better than those of non-fiber-reinforced RFAC. The shrinkage cracking behavior was examined using plat-ring-type and slab-type tests. The fiber-reinforced RFAC showed a greater reduction in the surface cracks than non-fiber-reinforced concrete. The addition of fibers at a small volume fraction in RFAC is more effective for drying shrinkage cracks than for improving mechanical performance.
本文介绍了一项实验研究，旨在探究纤维增强对两种纤维（聚乙烯醇（PVA）和尼龙）增强再生细骨料混凝土（RFAC）力学性能和收缩开裂的影响。在含聚乙烯醇或尼龙纤维的再生细骨料混凝土中，使用0.05%或0.1%等小纤维体积分数，以实现最小用量下的最佳效率。此外，为了对力学性能和收缩开裂进行比较评估，我们还研究了天然细骨料混凝土。试验结果表明，纤维和细骨料的添加在改善所研究混凝土试件的力学性能以及控制其开裂行为方面发挥着重要作用。纤维增强再生细骨料混凝土的抗压强度、劈裂抗拉强度和抗弯强度等力学性能略优于非纤维增强再生细骨料混凝土。使用平板环型和板型试验研究了收缩开裂行为。纤维增强再生细骨料混凝土的表面裂缝比非纤维增强混凝土减少得更多。在再生细骨料混凝土中添加小体积分数的纤维对干燥收缩裂缝的效果比对改善力学性能更有效。
