Chloride Penetration Resistance of Polyvinyl Alcohol Fiber Concrete under Dry and Wet Cycle in Chloride Salt Solutions

doi:10.11902/1005.4537.2019.175

Journal of Chinese Society for Corrosion and protection

2020, Vol. 40

Issue (4): 381-388 DOI: 10.11902/1005.4537.2019.175

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Chloride Penetration Resistance of Polyvinyl Alcohol Fiber Concrete under Dry and Wet Cycle in Chloride Salt Solutions

WEN Yang¹(

), XIONG Lin¹, CHEN Wei¹, XUE Gang¹, SONG Wenxue²

1. School of Civil Engineering, Inner Mongolia University of Science and Technology, Baotou 014010, China
2. Baotou Highway Engineering Company Ltd. , Baotou 014010, China

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Abstract

The Cl^- permeation resistance of polyvinyl alcohol fiber reinforced concrete under cyclic tests of drying in air and wetting in chloride salt solution by means of nuclear magnetic resonance (NMR) technique and microscopic scanning electron microscopy (SEM). The distribution of pores and chloride salts in concretes with different among of 18 mm long polyvinyl alcohol (PVA) fibers were assessed. The results show that under the same number of dry-wet cycle, the Cl^- permeation resistance for the concretes increases first and then decreases with the increase of fiber content. The concrete with 1.2 kg/m³ polyvinyl alcohol fiber has a maximum Cl^- penetration depth of 4.1 mm, and the peak value of free chloride ion content is 0.17%, which is 29.3% and 32% lower than that of the reference concrete, respectively, but when the fiber content exceeds 1.2 kg/m³, the Cl^- permeation resistance of the concrete degraded, namely its maximum intrusion depth rose to 5.2 mm with Cl^- penetration resistance of only 10.3% above that of the plain concrete. With the increase number of the dry-wet cycle, the peak value of the free Cl^- content of the fiber-filled concretes filled with the same among of PVA was continuously shifted to the right side, correspondingly, the maximum intrusion depth and free Cl^- content increased significantly. It follows that the fiber content and the number of dry-wet cycle have significant effect on the Cl^- penetration resistance of PVA fiber concrete.

Key words: polyvinyl alcohol fiber concrete dry and wet cycle nuclear magnetic resonance microstructure resistance to Cl^- permeability

Received: 09 October 2019

ZTFLH:

TG172

Fund: National Natural Science Foundation of China(51768056);National Natural Science Foundation of China(51868063);Natural Science Foundation of Inner Mongolia(2019MS05038)

Corresponding Authors: WEN Yang E-mail: wenyangalbert@163.com

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Cite this article:

WEN Yang, XIONG Lin, CHEN Wei, XUE Gang, SONG Wenxue. Chloride Penetration Resistance of Polyvinyl Alcohol Fiber Concrete under Dry and Wet Cycle in Chloride Salt Solutions. Journal of Chinese Society for Corrosion and protection, 2020, 40(4): 381-388.

URL:

https://www.jcscp.org/EN/10.11902/1005.4537.2019.175 OR https://www.jcscp.org/EN/Y2020/V40/I4/381

Table 1 PVA fiber concrete mix ratio (kg/m³)

Fig.1 Schematic diagram of the maximum intrusion depth of Cl^- in concrete

Fig.2 Change of Cl^- content in test pieces with different PVA fiber content after 28 d (a), 56 d (b), 84 d (c) and 112 d (d) of dry-wet cycle

Table 2 Free Cl^- diffusion coefficient (10^-6 mm²·s^-1)

Fig.3 T₂ spectrum of PVA fiber concrete with different dosages

Table 3 T₂ spectral area of PVA fiber concrete under different dosages

Fig.4 Pore size distribution of PVA fiber concrete under different dosages

Fig.5 Micro-morphologies of PVA concrete before wet and dry circulation: (a) CC, (b) PC-0.8, (c) PC-1.2, (d) PC-1.6

Fig.6 Micro-morphologies of 112 d PVA concrete in wet and dry cycle: (a) CC, (b) PC-0.8, (c) PC-1.2, (d) PC-1.6

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