Salt amounts on steel bridge girders with washing-out effect of condensation drops running down surface

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  • 結露水の流下による洗浄を踏まえた鋼橋主桁への付着塩分量評価
  • ケツロスイ ノ リュウカ ニ ヨル センジョウ オ フマエタ コウキョウ シュゲタ エ ノ フチャク エンブンリョウ ヒョウカ

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Abstract

The deterioration of a bridge is promoted by water on the surface. On the other hand, some water drops due to condensation are expected to run down bridge surfaces and then wash off salt on the surfaces. Therefore, it is important to estimate the salt amounts on bridge surfaces considering the washing-out effect of condensation drops to achieve effective maintenance. The authors sought to estimate the amounts of water formed on steel bridge girders on the basis of the 1-D heat conduction equation, and investigate the conditions for a water drop to run down a surface and the amount of salt removed by a drop. The salt amounts calculated on surfaces were decreased with the washing-out of condensation drops.

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