Abstract—A double-deck tunnel is an advanced tunnel construction technology that has been applied under various conditions around the world. This type of tunnel consists of multi-deck roads in a single tunnel, and each deck can be a complex formation of roads for vehicles or waterways, thus offering the advantage of maximizing national infrastructures and diversifying the functions of a tunnel. In this paper, the characteristics and durability of various types of cement-based grouts that can be applied in the construction and reinforcement of double-deck tunnels were investigated. Types of grouting materials were divided into cement grout, which has quick setting properties, and mortar grout, which has high strength properties. Looking at the cement grouts, the quick setting property was excellent when sodium silicate was used as a set accelerating agent, but multiple cracks were found due to changes in volume and a reduction in strength was observed over the longer term. When a mineral-based set accelerating agent (calcium aluminate) was used, excellent durability was shown, including an increase in strength, and there were no significant changes in volume and cracks over the long term. Changes in strength and volume in mortar grouts were proportional to the water-cement ratio, and the results of chemical resistance and volume change measurement showed that the high strength-type had the best durability performance.
Index Terms—Double-deck tunnel, grouting, reinforcement, durability.
H. S. Heo is with R&D Center the Jntinc Co. Ltd., 18284 Korea (e-mail: vocuum@naver.com)
B. J. Lee is with the Civil Engineering Department, University of Daejeon, Daejeon, 34520 Korea (e-mail: bjlee@dju.kr).
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Cite: H. S. Heo and B. J. Lee, "Study on Durability of Grouting Materials for Reinforcement in a Double-Deck Tunnel," International Journal of Engineering and Technology vol. 10, no. 4, pp. 294-299, 2018.
