The use of rubber in concrete has been practiced in the engineering community for several years. However, the poor mechanical properties of rubberized concrete are a serious hurdle. This innovative research provides a closer look at improving the flexural strength of rubberized concrete beams with high rubber content using confinement technique. FRP jackets with different confinement thickness were used to recover the strength loss of rubberized concrete beams. In this paper, 66 rubberized concrete (RuC) beams having 0–50% rubber content were tested under four-point loading. RuC beams suffered up to 167% reduction in flexural strength. However, the FRP jackets were highly effective to improve the flexural strength of RuC beams. The statistical models were developed to predict the flexural strength of FRP confined rubberized concrete beams using response surface methodology (RSM). In this regard, the effect of two principle variables; unconfined strength and number of FRP layers on the flexural strength of FRP confined rubberized concrete beams was investigated. The models were found significant because the predicted and adjusted R² was less than 0.2 (a limit proposed by Design Expert software). The predicted and experimental results for FRP confined rubberized concrete beams were found in good agreement. The developed statistical models provide insights into the sensitivity of parameters affecting the flexural strength. The proposed models can improve the reliability of the experiments and reduces the design and analysis time.

在工程界已经在混凝土中使用橡胶多年了。然而，橡胶混凝土的机械性能差是一个严重的障碍。这项创新的研究为使用封闭技术提高橡胶含量高的橡胶混凝土梁的抗弯强度提供了更详尽的了解。使用具有不同限制厚度的FRP护套来恢复橡胶混凝土梁的强度损失。在本文中，在四点荷载下测试了66个橡胶含量为0-50％的橡胶混凝土（RuC）梁。RuC梁的抗弯强度最多降低了167％。但是，FRP护套对提高RuC梁的抗弯强度非常有效。建立了统计模型，以使用响应表面方法（RSM）来预测FRP承压橡胶混凝土梁的抗弯强度。在这方面，两个主要变量的影响；研究了无侧限强度和FRP层数对FRP承压橡胶混凝土梁抗弯强度的影响。发现这些模型很重要，因为预测和调整后的R²小于0.2（Design Expert软件提出的限制）。对FRP承压橡胶混凝土梁的预测和实验结果吻合良好。发达的统计模型提供了有关影响抗弯强度的参数敏感性的见解。提出的模型可以提高实验的可靠性，并减少设计和分析时间。