An investigation was undertaken to study the behaviour of cement-stabilized aggregate mixtures modified with small amounts of rubber under compressive loading with the aim of providing more sustainable and less brittle mixtures for use in semi-rigid pavements. Three rubber replacement levels (15%, 30%, and 45% by same volume of one aggregate fraction that has similar particle gradation) were investigated. The rubber particles have higher surface roughness than the aggregate particles they replace. To understand the behaviour, this study was conducted at both macro- and meso-scale levels utilizing mechanical testing, x-raying the internal structure and monitoring the crack propagation. The results showed a higher reduction in the compressive strength compared to the tensile strength. X-ray images confirmed an interconnected cracking network through/around the rubber particles. This resulted in a delay to crack development, with the velocity of crack propagation declining due to rubber incorporation. As the latter phenomenon is governed by the stress distribution inside the mixture, therefore a rubber distribution quantitative study confirmed a fairly uniform rubber distribution only for low and moderate rubber content, suggesting that the low rubber content can be used to ensure better properties and to overcome the shortcomings of normal cemented pavement mixtures.

进行了一项研究，以研究在少量压力下用少量橡胶改性的水泥稳定的骨料混合物的性能，目的是为半刚性路面提供更可持续，更脆的混合物。研究了三种橡胶替代水平（按相同体积的一种具有相似颗粒级联的聚集体部分的相同体积计为15％，30％和45％）。橡胶颗粒的表面粗糙度高于其替代的聚集体颗粒。为了了解行为，本研究在宏观和中观两个方面进行使用机械测试，对内部结构进行X射线检查并监测裂纹扩展的水平级别。结果表明，与拉伸强度相比，压缩强度的降低幅度更大。X射线图像证实了穿过/围绕橡胶颗粒的相互连接的裂纹网络。这导致裂纹发展的延迟，由于掺入橡胶，裂纹传播的速度下降。由于后一种现象是由混合物内部的应力分布决定的，因此橡胶分布定量研究证实，仅对于中低橡胶含量，橡胶分布相当均匀，这表明低橡胶含量可用于确保更好的性能并克服普通水泥路面混合物的缺点。