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超高性能轻型组合桥面UHPC-沥青面层 层间黏结性能研究
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Bond Performances between Asphalt Surface and UHPC of Ultra-High Performance Lightweight Composite Decks
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    摘要:

    UHPC 下承层与沥青面层牢固黏结对延长桥面使用寿命,避免滑移、脱层等病害十分重要.采用有限元分析和室内试验,研究不同类型黏结剂、环境温度等对UHPC-沥青面层层间黏结性能的影响.复合试件剪切试验和拉拔试验表明:环境温度对UHPC-沥青面层层间强度有较大影响,高温(60 ℃)下层间黏结强度较常温(20 ℃)时有显著下降;KD-HYP环氧、202环氧较环氧沥青、壳牌HV、橡胶沥青表现出更佳的黏结性能;环氧沥青高温黏结性能优于壳牌HV、橡胶沥青,但常温下三者无明显差别.洞庭湖二桥有限元仿真计算得出,UHPC-SMA层间最大剪应力在20 ℃(常温)和60 ℃(高温)时分别为0.696 MPa、0.422 MPa,层间最大法向拉应力分别为0.167 MPa、0.152 MPa.研究表明,洞庭湖二桥在超载、紧急制动及动荷载等最不利荷载组合下,KD-HYP环氧和202环氧能满足常温和高温条件下层间黏结性能要求,并且具有足够的安全储备;而壳牌HV、橡胶沥青和环氧沥青无法满足高温层间黏结性能要求.

    Abstract:

    It is important to guarantee strong bonding between UHPC and asphalt surface to prolong the service life and avoid the diseases of the bridge deck,such as slippage and delamination. Finite element analysis and laboratory tests were conducted to investigate the influences of kinds of binders and ambient temperatures on bonding performances. The test results showed that the ambient temperature had a great effect on the interface strength by shear and pull-off tests of composite specimens. Compared with normal temperature (20℃),the interface bonding performances had been decreased greatly at high temperature(60℃). Epoxy binders named KD-HYP and 202 exhibited better bonding ability than epoxy asphalt,Shell HV and rubber asphalt. Although epoxy asphalt had higher bonding strength than Shell HV and rubber asphalt at high temperature,but there were no obvious differences among them at normal temperature. The finite element simulation of the second Dongting Lake Bridge showed that the maximum shear stress between UHPC-SMA was 0.696MPa and 0.422MPa respectively at 20℃(normal temperature) and 60℃(high temperature),and the maximum tensile stress was 0.167MPa and 0.152MPa respectively. The researches indicate that,under the most unfavorable load combinations consisting of overload,braking hardly and dynamic loads,KD-HYP and 202 can meet the requirements of interface bonding stresses,and are of sufficient safety at normal temperature and high temperature. But Shell HV,rubber asphalt and epoxy asphalt cannot do at high temperature.

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李嘉,夏杨嘉玲,王万鹏,李树原.超高性能轻型组合桥面UHPC-沥青面层 层间黏结性能研究[J].湖南大学学报:自然科学版,2019,46(5):11~20

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  • 在线发布日期: 2019-05-17
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