Abstract:

The global cumulative amount of waste tires is increasing year by year. Replacing part of the fine aggregate in concrete with crumb rubber particle （CR） produced from crushed waste tires to prepare crumb rubber concrete （CRC） is an important approach for large-scale consumption and high-value utilization of waste tires. Meanwhile， this modification can enhance the toughness， frost resistance， thermal insulation， and noise reduction properties of concrete. However， the basic mechanical properties of CRC are often lower than those of ordinary concrete， which directly restricts its popularization and application， failing to give full play to its performance advantages. Focusing on domestic and international studies related to the basic mechanical properties of CRC， this paper adopted the literature clustering method to analyze the research focus in the CRC field. It systematically sorted out the influence regularities of CR replacement rate， particle size， and modification treatments on the compressive strength， splitting tensile strength， and flexural strength of CRC. The deterioration mechanism of its mechanical properties was analyzed by combining with the characteristics of microstructure. In addition， the research progress of mesoscale numerical simulation was summarized， and a comprehensive review framework covering macroscale， mesoscale， and microscale was established. The results indicate that a 10% （volume fraction） CR replacement rate is the critical threshold to ensure the mechanical properties and engineering applicability of CRC. Composite modification methods can effectively improve the mechanical strength of CRC， while the thickness of the interfacial transition zone （ITZ） and the proportion of harmful pores are the core indicators linking microstructure to macro-mechanical properties.

Key words: waste tire, crumb rubber particle, crumb rubber concrete, basic mechanical property, microstructural characteristic, mesoscale numerical simulation