Effects of Traffic Vibrations on the Flexural Properties of Newly Placed PVA-ECC Bridge Repairs

被引:7
|
作者
Zhang, Xiaodong [1 ]
Liu, Shuguang [1 ,2 ]
Yan, Changwang [2 ]
Wang, Xiaoxiao [1 ]
Wang, Huiwen [3 ]
机构
[1] Inner Mongolia Univ Technol, Sch Mat Sci & Engn, Hohhot 010051, Peoples R China
[2] Inner Mongolia Univ Technol, Sch Min & Technol, Hohhot 010051, Peoples R China
[3] Beijing Tuowei Times Architectural Design Co Ltd, Beijing 100020, Peoples R China
基金
中国国家自然科学基金;
关键词
PVA-ECCs; bridge repairs; setting periods; traffic vibrations; strain-hardening characteristics; flexural properties; CURING CONCRETE STITCH; MECHANICAL-PROPERTIES; STRENGTH; PERFORMANCE; CRACKING;
D O I
10.3390/ma12203337
中图分类号
O64 [物理化学(理论化学)、化学物理学];
学科分类号
070304 ; 081704 ;
摘要
Polyvinyl alcohol fiber reinforced engineering cementitious composites (PVA-ECCs) exhibit excellent tight-cracking and super-high toughness behaviors and have been widely used in bridge repair projects. In reality, the conventional method in bridge repair is that a portion of the bridge is closed and repaired while the other portion is left open to traffic. Consequently, newly placed PVA-ECC bridge repairs (NP-ECC-BRs) are exposed to continuous traffic vibrations (TRVs), even during the setting periods. However, whether or not TRVs affect the expected flexural properties of NP-ECC-BRs remains unknown. The purpose of this investigation was to determine the effects of TRVs on the attainable flexural properties of NP-ECC-BRs. For this purpose, a total of 324 newly fabricated thin-plate specimens were exposed to different vibration variables using self-designed vibration equipment. After vibration, a four-point flexural test was conducted to determine the flexural properties of the specimens. The results indicate that the effects of TRVs on the strengths of NP-ECC-BRs was significantly negative, but insignificantly positive for flexural deformation. We concluded that in the design of PVA-ECC bridge repairs, effects of TRVs on the flexural deformation capacity of NP-ECC-BRs are not a cause for concern, but serious consideration should be given to the associated reduction of flexural load-bearing capacity.
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页数:19
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