Multi-scale prediction model of chloride diffusivity of fiber reinforced concrete

TONG Liangyu; LIU Qingfeng

doi:10.13801/j.cnki.fhclxb.20220422.003

Volume 39 Issue 11

Nov. 2022

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TONG Liangyu, LIU Qingfeng. Multi-scale prediction model of chloride diffusivity of fiber reinforced concrete[J]. Acta Materiae Compositae Sinica, 2022, 39(11): 5181-5191. doi: 10.13801/j.cnki.fhclxb.20220422.003

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TONG Liangyu, LIU Qingfeng. Multi-scale prediction model of chloride diffusivity of fiber reinforced concrete[J]. Acta Materiae Compositae Sinica, 2022, 39(11): 5181-5191. doi: 10.13801/j.cnki.fhclxb.20220422.003

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Multi-scale prediction model of chloride diffusivity of fiber reinforced concrete

doi: 10.13801/j.cnki.fhclxb.20220422.003

TONG Liangyu¹,
LIU Qingfeng^{1, 2
,
,}

1.
State Key Laboratory of Ocean Engineering, School of Naval Architecture, Ocean & Civil Engineering, Shanghai Jiao Tong University, Shanghai 200240, China
2.
Shanghai Key Laboratory for Digital Maintenance of Buildings and Infrastructure, Shanghai 200240, China

Received Date: 2022-02-11
Accepted Date: 2022-04-15
Rev Recd Date: 2022-04-15

Available Online: 2022-04-24

Publish Date: 2022-11-01

Abstract

Abstract

Fiber reinforced concrete (FRC) is a complex heterogeneous composite material, and its macro durabi-lity will be determined by the microscopic and mesoscopic components. By electing representative elements, a multi-scale model was established in this study to predict the chloride diffusivity of FRC with the consideration of heterogeneous feathers from micro to macro scale. In the present model, the percolation effect and the interface transition zones (ITZs) between fiber, aggregate and cement paste were carefully considered. Taking basalt fiber concrete as an example, the model was verified by experimental data and the influential parameters were discussed in detail. The results show when the water to cement ratio (w/c) exceeds a certain limit (about 0.45), the chloride diffusivity of FRC increases exponentially with the w/c, and results also indicate that the chloride diffusivity of FRC is mainly affected by the ITZs between the fiber and the cement paste. Adding the fiber content or decreasing the diameter of fibers will all increase the volume fraction of ITZs and lead to a poor chloride resistance performance. However, it is interestingly to find that no fixed negative or positive relationship exist between chloride diffusivity of FRC and the fiber content. The proposed model can effectively predict the diffusivity of FRC and hope to provide guidance or reference for engineering practice.
- fiber reinforced concrete,
- multiscale,
- chloride diffusivity,
- homogenization,
- interface transition zones
Long Abstrsct
Innovation Points

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References(50)

References

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