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上海理工大学环境与建筑学院,上海,200093
Published:2021
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李秀君,叶锫锫,吕建伟,朱思杨.浸水条件下环氧微表处与沥青路面层间抗剪性能的试验研究∗[J].防灾减灾工程学报,2021,(2):321-327
Li Xiujun. Study on Bonding Property between Water-borne Epoxy Resin Micro- Surfacing and Asphalt Pavement under Water Immersion[J]. 2021, (2): 321-327.
微表处在工程应用过程中受水与车辆荷载作用,容易产生推移或整片剥落。为此,在微表处中添加适量不同种类的水性环氧树脂(Water?borne Epoxy Resin,WER)形成环氧微表处,通过拉伸试验和自主设计的 45°斜剪试验, 研究 WER 对环氧微表处在浸水条件下层间抗剪性能的影响。试验结果表明:胶结料在掺入刚性较大的 WER 后, 随浸水时间增加,胶结料塑性变形能力削弱,弹塑性阶段与塑性阶段减短,脆性增加,而掺加柔性的 WER,塑性阶段持续时间较长;浸水状态下,环氧微表处与沥青路面的层间抗剪强度影响因素主次顺序为油石比>WER 掺量> WER 掺加方式,而切向变形率的影响因素主次顺序为 WER 掺量>WER 掺加方式>油石比。在工程应用中,建议采用油石比 7%、WER 掺量 8%~12% 且将环氧树脂与固化剂预先调和后加入水中,然后与集料进行拌合。
Affected by water and vehicle loads during engineering applications,micro-surfacing is easy to shift or peel off. Therefore,an appropriate amount of different kinds of water-borne epoxy resins (WER)was added to the micro-surfacing to form the water-borne epoxy resin micro-surfacing(WER micro-surfacing). The effect of WER on the interlaminar shear resistance of micro-surfacing under water immersion conditions was studied by tensile test and self-designed 45° oblique shear test. The test results show that:the plastic deformation ability of asphalt-cement is weakening with immersion time after adding rigid WER,the elastic-plastic phase and the plastic phase shorten,and the brittleness increases. However,the plastic phase of the asphalt-cement with flexible WER lasts for a long time. In the water immersion state,the influence degree on the interlaminar shear strength between epoxy micro-surfacing and asphalt pavement is asphalt-aggregate ratio,WER content,WER adding method in descending order. The main influencing factor on tangential deformation rate is WER content,following by WER adding method and asphalt-aggregate ratio successively. In engineering applications,it’srecommended that 7% asphalt-aggregate ratio and 8%~12% WER content be used. The epoxy resin and curing agent should also be pre-mixed and then mixed with the aggregate.
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