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| Experimental study on mechanical properties of tunnel isolation material composed of polyurethane matrix and fine aggregate |
| WANG Shaofeng, CAO Xiangpeng
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| China Railway Siyuan Survey and Design Group Co., Ltd., Wuhan 430063, Hubei, China |
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Abstract To investigate the mechanical properties of polyurethane cement mortar(PCM), a series of tests were conducted to evaluate its compressive strength, tensile strength, elastic modulus, and hysteresis characteristics. The results demonstrated that PCM with a polyurethane-to-cement ratio of 1∶2 and a cement content of 40% exhibited higher compressive strength, tensile strength, and elastic modulus, along with a reduction in elongation at break. Meanwhile, in order to verify its elastic recovery performance, the material was subjected to loading, unloading, and reloading at a strain amplitude of 0.55. The experimental results revealed that PCM displayed favorable hysteresis characteristics. Finally, the failure mechanism of PCM was examined through microscopic analysis.
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Published: 18 June 2025
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