Volume 22 Issue 5
Oct.  2022
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ZHAN Xue-fang, WANG Xian, YAN Heng-li, ZHAO Yi-bin, SHI Yuan-yuan. Tensile performance and application of LEM-SHCC road-bridge link slab mixed with rubber powder for fully jointless bridge[J]. Journal of Traffic and Transportation Engineering, 2022, 22(5): 104-118. doi: 10.19818/j.cnki.1671-1637.2022.05.005
Citation: ZHAN Xue-fang, WANG Xian, YAN Heng-li, ZHAO Yi-bin, SHI Yuan-yuan. Tensile performance and application of LEM-SHCC road-bridge link slab mixed with rubber powder for fully jointless bridge[J]. Journal of Traffic and Transportation Engineering, 2022, 22(5): 104-118. doi: 10.19818/j.cnki.1671-1637.2022.05.005
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Tensile performance and application of LEM-SHCC road-bridge link slab mixed with rubber powder for fully jointless bridge

doi: 10.19818/j.cnki.1671-1637.2022.05.005

  • School of Civil Engineering, Central South University of Forestry and Technology, Changsha 410004, Hunan, China

Funds:

National Natural Science Foundation of China 51904357

Natural Science Foundation of Hunan Province 2021JJ41085

Science and Technology Innovation Program of Hunan Province 2020RC4049

Scientific Research Fund of Hunan Provincial Education Department 21B0270

More Information
  • Author Bio:

    ZHAN Xue-fang(1983-), female, assistant professor, PhD, janehnu@hotmail.com

  • Received Date: 2022-04-26
  • Publish Date: 2022-10-25
    Abstract
  • In order to solve the problems of excessive crack width and excessive internal force of the road-bridge link slab for a fully jointless bridge, the isopyknic rubber powder was added to a strain-hardening cementitious composite (SHCC) material to partly replace the fine sand, then the SHCC material with a low elastic modulus (LEM-SHCC) was made, which was used for the road-bridge link slab for a fully jointless bridge. The basic material properties (density, compressive strength, and elastic modulus) and tensile property of LEM-SHCC with five different rubber powder contents (0, 5%, 10%, 15%, and 20%) were tested. The effect of rubber powder content on the strength and deformation performance of LEM-SHCC was analyzed. Meantime, the difference of ratio of tensile strain to compressive strain was used to evaluate the effect of rubber powder content on the SHCC material, and an optimal mix proportion of LEM-SHCC was obtained. For a LEM-SHCC road-bridge link slab with a rubber powder content of 15%, its absorptive deformation capacity, tensile deformation performance, and crack distribution law after cracking under the most unfavorable load (temperature drop load) were studied and compared with all the performance of the SHCC road-bridge link slab with the same size. A finite element comparative analysis for the sensitive parameters of the LEM-SHCC road-bridge link slab (the main influencing factors such as the rubber powder content, friction coefficient at the slab bottom, slab length, and so on) was carried out. Research results show that when the rubber powder is added, the elastic modulus of SHCC decreases, and the ductility of SHCC increases. When the rubber powder content reaches 15%, the elastic modulus of SHCC decreases by 40%, while the ductility increases by nearly 50%, with the crack width effectively controlled within 60 μm. When the absorptive longitudinal deformation of the LEM-SHCC road-bridge link slab reaches 10 mm, the micro-cracks on the surface of the LEM-SHCC road-bridge link slab are dense (nearly 180 micro-cracks), and the crack spacing is small (15-80 mm). The crack width after cracking is controlled within 60 μm. At the same time, the slab stress of the tension end is 2.1 MPa, and the anchoring force of the anchorage end is 150.5 kN. After unloading, the cracks are closed, and no fibers are pulled out or broken. The internal force of the LEM-SHCC slab which absorbs the same longitudinal deformation of 10 mm is smaller than that of the SHCC slab with the same size. The internal force of the LEM-SHCC slab is greatly affected by the rubber powder content, and the LEM-SHCC slab has optimal performance when the content is 15%. The internal force of the LEM-SHCC slab is slightly affected by the friction coefficient at the slab bottom. In addition, the mechanical performance of the LEM-SHCC slab can be effectively improved by an increase in the slab length. It is recommended that the design length of the LEM-SHCC slab should be 8.5 m.

     

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