With the rapid development of the global transportation industry, the number of used automobile tires has increased dramatically. Rubber, the main component of tires, features a strong thermal degradation resistance; thus, the efficient recycling of waste rubber has become a scientific and engineering challenge that requires urgent solution [1,2]. In 2015, countries at the Paris Climate Conference agreed on an energy consumption and carbon emission reduction strategy and advocated policies to conserve resources and protect the environment. At present, the civil engineering materials industry is focused on the efficient use of renewable materials and has advocated for green development. To effectively improve the physical and mechanical properties of mortars and improve its ductility and compressive deformation capacity, rubber particles can be effectively combined with cement and sand to form crumb rubber mortars. In this way, resources can be recycled to promote the sustainable development of nature, the economy and society in general. Therefore, it is necessary to systematically study the mechanical properties of crumb rubber mortars [3–۵]. Crumb rubber mortars have been widely used in the fields of building construction, road construction and underground engineering. In particular, crumb rubber mortars can be introduced into highways, high-speed railways, and airport pavements. Furthermore, crumb rubber mortars have been used as a structural material to enhance the dynamic performance and seismic performance of concrete structures [6,7]. Scholars worldwide have conducted substantial experimental research on the mechanical properties and durability of crumb rubber mortars and have achieved a series of valuable results [8–۱۰]. For example, Li et al. used various content and sizes of rubber particles filling highstrength concrete (RHSC) to conduct mechanical experimental research [11]. The results showed that adding rubber powder can reduce the strength of high-strength concrete, increase energy absorption capacity, reduce brittleness, and increase the ductility of high-strength concrete. Shen et al. used scanning electron microscope (SEM) to observe polymer–rubber aggregatemodified porous concrete [12]. Their study found that the interfacial transition zones between the rubber and cement slurry were enhanced by the polymer and that the polymer films in the cement hydrate and rubber particles lay in a staggered distribution, increasing the flexibility of the crumb rubber concrete (CRC). By changing the volume ratio of the rubber particles in crumb rubber mortars, Khaloo et al. found that the brittle behavior of rubber granule concrete decreases as the rubber content increases and that its strength and tangential elastic modulus are greatly reduced [13]. Liu et al. studied the fatigue properties of standard crumb rubber mortar samples with 60 different rubber contents [14].