期刊
出版社
SAGE PUBLICATIONS LTD
DOI: 10.1177/09544097211020595
关键词
Rubber concrete sleeper; digital image correlation; three points bending moment test; sleeper fracture behavior
资金
- China Academy of Railway Science [2020YJ081]
The study found that rubber prestressed concrete sleepers have a higher resistance against crack initiation compared to conventional prestressed concrete sleepers under the same loading condition, but they also have a higher crack growth rate, resulting in a lower load at which the first crack is detected and a relatively lower strength.
Rubber concrete (RC) has been confirmed to be suitable for concrete sleeper production. This paper studies the cracking behaviour of conventional and rubber-reinforced concrete sleepers based on the results of an experimental program. The cracking behaviour in the pure bending zone was analysed up to a load of 140 kN. The crack mouth opening displacement (CMOD) was accordingly measured using a digital image correlation (DIC) method. The DIC results show that the rubber prestressed concrete sleeper (RPCS) has a resistance against crack initiation that is 20% greater than that of the conventional prestressed concrete sleeper (CPCS) under the same loading condition; however, due to the higher crack growth rate of the RPCS, the first crack detected by the operator forms at 60 kN, which corresponds to a strength approximately 9% lower compared with the 65 kN load at which the first crack is detected in the CPCS. Before the first crack (60 kN), the RPCS has a deflection 35% lower than that of the CPCS, but after cracking, at loads of 80 kN, 100 kN and 140 kN, the RPCS has a deflection 15%, 4% and 24% higher than that of the CPCS, respectively.
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