In this study, different nano-particles were used to modify recycled aggregates concrete (RAC) containing recycled clay brick aggregates (RCBAs) to improve the RAC properties. Two stages of experimental works were performed. In the first stage, various nano-particle mixtures produced by different mixing methods, i.e. the use of surfactant and ultrasonication, were examined by optical microscope to evaluate the dispersion of the nano-particles in water liquid. The nano-particles modified cement mortar specimens were further evaluated by flexural tensile test to check how these mixing methods affect the properties of the nano-particle modified cement mortar. In the second experimental stage, the effects of four replacement ratios of recycled aggregates, three type of nano-particles, two mixing methods of RAC, additional surfactant and ultrasonication process used in the mix of nano-particle liquid, and the dosages of the nano-particles on the workability, compressive and split tensile properties of the nano-particle modified RAC were investigated.

在这项研究中，使用了不同的纳米粒子来改性包含再生粘土砖骨料（RCBA）的再生骨料混凝土（RAC），以改善RAC性能。进行了两个阶段的实验工作。在第一阶段，通过光学显微镜检查通过不同的混合方法（即使用表面活性剂和超声处理）生产的各种纳米颗粒混合物，以评估纳米颗粒在水液体中的分散性。通过弯曲拉伸试验进一步评估了纳米颗粒改性的水泥砂浆样品，以检查这些混合方法如何影响纳米颗粒改性的水泥砂浆的性能。在第二个实验阶段，四种替代比例的回收骨料，三种类型的纳米粒子，两种RAC混合方法的影响，