可自修复的高延性混凝土(ECC)在机场道面的适用性研究
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重庆大学山地城镇建设与新技术教育部重点实验室

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中图分类号:

U416.1

基金项目:

国家自然科学基金青年项目(51708061);东南大学混凝土及预应力混凝土结构教育部重点实验室开放课题(CPCSME2017-09)


Feasibility study of engineered cementitious composites (ECC) with self-healing capacity for airfield pavement use
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Affiliation:

1.Key Laboratory of New Technology for Construction of Cities in Mountain Area of the Ministry of Educution, Chongqing University;2.Key Laboratory of New Technology for Construction of Cities in Mountain Area of the Ministry of Educution,Chongqing University

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The self-healing behavior and mechanism of ECC for jointless airfield pavement use

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    摘要:

    在飞机荷载与环境荷载的长期共同作用下,机场道面易出现裂缝类、接缝类和竖向位移类病害,使运营阶段维修成本高。鉴于此,本文提出将具有自修复功能的高延性水泥基材料(ECC)用于机场道面,以控制裂缝发展、实现无缝连接;并利用ECC因二次反应而使微裂缝愈合的特性,减少路面维护工作,延长使用寿命。本文通过试验手段研究了ECC材料应用于机场道面的力学行为、自修复行为和早期开裂潜能。试验结果表明:机场道面用ECC材料在拉伸荷载作用下,其拉伸应变可达3.67%(约为普遍混凝土的400倍);在弯曲荷载作用下,其竖向弯曲变形可达6.33 mm;抗压强度与弯曲强度分别为43.9MPa和12.68MPa,可满足机场道面的使用要求。在受约束条件下,ECC表现出了较低的早期开裂潜能。由于自修复能力,裂损ECC的拉伸刚度、拉伸应变与拉伸强度几乎可恢复至未裂时的程度;其水渗透系数随自修复进程逐渐降低,最终达到未裂时的渗透水平。本文研究结果表明ECC材料用于无缝机场道面具有较高的适用性。

    Abstract:

    Under the effects of mechanical and environmental loading, airfield pavement is prone to appear the distresses of cracking, joints damage and vertical moves of pavement panels, which results in frequent maintenance. Aiming at controlling propagation of cracks and achieving jointless function, this study attempts to apply engineered cementitious composites (ECC) as an airfield pavement material due to its high ductility and intrinsic self-healing capacity. Damage in ECC could be healed by secondary hydration, which leads to low cost in long-lasting service life. In this paper, it investigated the mechanical properties of ECC and its self-healing behavior as well as the cracking potential at early age of ECC. The result shows that ECC has high strain capacity of 3.67% under tension and deflection capacity of 6.33 mm under flexural load. The flexural and compressive strength is 12.68 MPa and 43.9 MPa, respectively, which meets requirements of airfield pavement. Under restrained shrinkage, ECC is expected to have a low tend in fracture failure. After self-healing, the tensile performance of ECC including stiffness, tensile strain capacity and tensile strength recovers largely. The water permeability coefficient of pre-damaged ECC decreases gradually to that of a virgin one. It can be concluded that ECC material is feasible in jointless airfield pavement.

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  • 收稿日期:2019-06-25
  • 最后修改日期:2019-10-27
  • 录用日期:2019-11-13
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