[1] Zhong Ke, Zhang Meng, Sun Mingzhi, Han Dingding, et al. Curing and mechanical property of single-componentpolyurethane porous elastic mixture [J]. Journal of Southeast University (English Edition), 2022, 38 (1): 56-61. [doi:10.3969/j.issn.1003-7985.2022.01.009]
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Curing and mechanical property of single-componentpolyurethane porous elastic mixture(
)
单组分聚氨酯多孔弹性混合料固化及力学特性分析
)Journal of Southeast University (English Edition)[ISSN:1003-7985/CN:32-1325/N]
- Volumn:
- 38
- Issue:
- 2022 1
- Page:
- 56-61
- Research Field:
- Traffic and Transportation Engineering
- Publishing date:
- 2022-03-20
Info
- Title:
- Curing and mechanical property of single-componentpolyurethane porous elastic mixture
- 单组分聚氨酯多孔弹性混合料固化及力学特性分析
- Author(s):
- Zhong Ke; Zhang Meng; Sun Mingzhi; Han Dingding
- Research Institute of Highway, Ministry of Transport, Beijing 100088, China
- Keywords:
- single-component polyurethane; curing performance; mechanical performance; porous elastic mixture
- PACS:
- U414
- DOI:
- 10.3969/j.issn.1003-7985.2022.01.009
- Abstract:
- The viscosity-time curve of a single-component polyurethane(PU)was examined to determine the mixing and compacting temperatures of its mixture and investigate the curing and mechanical properties of single-component PU porous elastic mixture(PPEM). The curing properties of the single-component PU and PPEM were studied with Fourier transform infrared spectroscopy(FTIR)and Marshall test. The mechanical properties of PPEM were explored via the following tests: rutting test, 3-point bending test, soaked Marshall stability test, freeze-thaw splitting test, and Cantabro test. The effects of a water bath on the stability of aggregate-PU/asphalt mortar-aggregate systems were evaluated through a pull-out test and a shear test. The results show that the recommended mixing temperatures of toluene diisocyanate and methylene diphenyl diisocyanate range from 75 to 80 ℃ and from 64 to 68 ℃, respectively. Room temperature(25 ℃)can be adopted as the compacting temperature of PPEM. PPEM can be fully cured in 4 d. Nevertheless, the water sprinkle method can obviously shorten the full curing time of PPEM. PPEM exhibites good resistance to rutting, brittle cracking, and raveling. The adhesive and shear strength of aggregate-PU/asphalt mortar-aggregate systems are negatively related to water bath duration.
- 为研究单组分聚氨酯(PU)多孔弹性混合料(PPEM)的固化及力学特性, 首先通过单组分聚氨酯的黏时曲线确定了多孔混合料的拌和温度与压实温度;其次, 采用傅里叶变换红外光谱试验和马歇尔试验研究了PU和PPEM的固化规律;然后, 利用车辙试验、三点弯曲试验、浸水马歇尔稳定试验、冻融劈裂试验和飞散试验研究了PPEM的力学特性;最后, 通过拉拔、剪切试验研究了水损害对集料-PU/沥青砂浆-集料体系稳定性的影响.结果表明:甲苯二异氰酸酯(PU-Ⅰ)与集料的最佳拌和温度为75~80 ℃, 而二苯基甲烷二异氰酸酯(PU-Ⅱ)与集料的最佳拌和温度为64~68 ℃, 且PPEM可在室温(25 ℃)下压实;PPEM的完全固化时间为4 d, 洒水法能明显缩短PPEM的完全固化时间;PPEM具有良好的抗车辙性能、低温抗裂性和抗剥落性能;集料-PU/沥青砂浆-集料体系的拉拔强度和抗剪强度与水损害时间呈负相关关系.
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Memo
- Memo:
-
Biography: Ke Zhong(1982—), male, doctor, researcher, k.zhong@rioh.cn.
Foundation item: The Fundamental Research Funds for the Central Research Institute(No. 2020-9054).
Citation: Zhong Ke, Zhang Meng, Sun Mingzhi, et al. Curing and mechanical property of single-component polyurethane porous elastic mixture[J].Journal of Southeast University(English Edition), 2022, 38(1):56-61.DOI:10.3969/j.issn.1003-7985.2022.01.009.