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List of products by author: T. Yoshioka
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A Current State of Defects due to Material Degradation on Road Tunnels in Japan
Abstract: For road tunnels in Japan, the New Austrian Tunneling Method (NATM) was introduced in 1989 as a technical standard. Since then, defects on permanent lining due to external force have considerably decreased in newly-constructed tunnels. However, flaking and cracks due to material degradation are still common defects, while new-devised techniques in order to improve quality of permanent lining...
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