Zhou Yingwu, Weng Yitao, Li Limiao, Hu Biao, Huang Xiaoxu, Zhu Zhongfeng
College of Civil and Transportation Engineering, Shenzhen University, Shenzhen 518060, China.
Guangdong Provincial Key Laboratory of Durability for Marine Civil Engineering, Shenzhen University, Shenzhen 518060, China.
Polymers (Basel). 2022 Jan 31;14(3):581. doi: 10.3390/polym14030581.
Fiber-reinforced polymer (FRP) composites have been used in various industries, thus a large amount of FRP wastes have been generated due to the out-of-service of FRP products. Recycling FRP wastes into coarse aggregates to replace natural coarse aggregates (NCA) to form the recycled FRP aggregate concrete (RFAC) is a potential approach to dispose of huge quantities of FRP wastes with low environmental impact. In this paper, waste glass FRP (GFRP) bars were cut into particles of 12 sizes to enable the grading of recycled FRP aggregate (RFA) as similar as possible to that of NAC. The influence of different RFA volume replacement ratios (0%, 30%, 50%, 70%, 100%) on the compressive performance of RFAC was investigated based on uniaxial compression tests of 15 standard cylinders. The results showed that the failure mode of RFAC was different from that of NAC. As the RFA replacement ratio increased, the compressive strength and elastic modulus of the RFAC gradually decreased, but its post-peak brittleness was significantly mitigated compared to NAC. The Poisson's ratio of RFAC increased with the increase in the RGFA replacement ratio at the elastic stage and was smaller than that of NCA concrete. Both the existing stress-strain models developed for NAC and recycled aggregate concrete (RAC) were found not fit for the RFAC. Thus, a new stress-strain model that was applicable to RFAC was developed by modifying the classical existing model, and a good agreement between the model predictions and test data was reached.
纤维增强聚合物（FRP）复合材料已在各个行业中得到应用，因此，由于FRP产品的退役，产生了大量的FRP废料。将FRP废料回收制成粗骨料以替代天然粗骨料（NCA），从而形成再生FRP骨料混凝土（RFAC），是一种处理大量FRP废料且对环境影响较小的潜在方法。在本文中，将废弃玻璃纤维增强塑料（GFRP）棒切割成12种尺寸的颗粒，以使再生FRP骨料（RFA）的级配尽可能与天然骨料（NAC）的级配相似。基于15个标准圆柱体的单轴压缩试验，研究了不同RFA体积替代率（0%、30%、50%、70%、100%）对RFAC抗压性能的影响。结果表明，RFAC的破坏模式与NAC不同。随着RFA替代率的增加，RFAC的抗压强度和弹性模量逐渐降低，但其峰值后脆性比NAC明显减轻。RFAC的泊松比在弹性阶段随RGFA替代率的增加而增大，且小于NCA混凝土的泊松比。研究发现，现有的针对NAC和再生骨料混凝土（RAC）建立的应力-应变模型均不适用于RFAC。因此，通过修改经典的现有模型，开发了一种适用于RFAC的新应力-应变模型，该模型预测结果与试验数据吻合良好。
