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Influence of expanded vermiculite on fire protection of intumescent fireproof coatings for steel structures

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Abstract

The effects of expanded vermiculite (EV) as modified filler to improve fire protection of intumescent fireproof coatings have been studied. It was found that the fire protection and char structure of the coating was significantly improved by adding 7% EV (by mass) into the coating. The results showed that the flaky structure of EV could promote the expansion and carbonization of the coating under fire, which could reinforce the heat-insulation performance of the char layer and reduce its corrosion at high temperature. The X-ray diffraction and thermogravimetry results indicate that additional EV may increase the thermal decomposition temperature of the coating and enhance the antioxidation performance of the char layer at high temperature. However, the study also shows that the excessive amount of EV with flaky structure will lead to the nonuniform diffusion of the nonflammable gases in the melting char under fire and will depress the fire protection and expansion performance of the coating.

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Acknowledgments

The authors acknowledge the support of the National Natural-Science Foundation of China (Grant No. 41072206) and the support of the Science and Technology Project of the Guizhou Provincial Department of Transportation (Nos. 2010-122-010 and 2010-122-013).

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Authors and Affiliations

  1. Department of Geotechnical Engineering, Tongji University, 1239 Siping Road, Shanghai, 200092, China

    Yadong Xue & Wenliang Yang

  2. College of Mining Engineering, Taiyuan University of Technology, 79 Yingze West Main Street, Taiyuan, 030024, China

    Shiping Zhang

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  1. Yadong Xue
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  2. Shiping Zhang
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Correspondence to Yadong Xue.

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Xue, Y., Zhang, S. & Yang, W. Influence of expanded vermiculite on fire protection of intumescent fireproof coatings for steel structures. J Coat Technol Res 12, 357–364 (2015). https://doi.org/10.1007/s11998-014-9626-3

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  • DOI: https://doi.org/10.1007/s11998-014-9626-3

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