There are many earthquakes in Japan. If a
large earthquake were to occur, it is necessary to consider how pipelines such
as: gas, sewage, telecommunications, and so on are restored quickly. At that
time, damaged gas pipelines are very dangerous because fire in large areas
could be caused by the leakage of gas from the damaged pipeline. Accordingly,
it is necessary for gas companies to stop the supply of gas to houses over a
large area. Once the gas supply is stopped, there is a considerable amount of
time to repair the pipelines over the area. For this reason, a quick method for
restoring damaged gas pipelines would be useful after an earthquake. Recently,
we have been developing new flash setting material for the damaged gas pipeline
by an injection into the house connection of gas when the gas supply is stopped
quickly in an emergency. From these points of view, in order to clarify to what
degree the contents of flash settling material affect the properties of the
injected fly ash mixture causing heavy damage to the gas pipeline in an
earthquake, different combinations of fly ash, chemical agents and water were
considered in several experiments.
References
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[4]
Agency of Natural Resources and Energy, “Gas Industry Earthquake Counter-measures Study Report,” 1996.
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Centre for Coal Utilization, “Report on Development of Coal Utilization Technology Development Strategy for the 21st Century,” 2003.
[9]
R. E. Davis, “A Review of Pozzolanic Materials and Their Use in Cement Concrete,” 1949.
[10]
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H. Shimada, T. Sasaoka, S. Kubota, K. Matsui and Y. Yoshida, “The Application of Fly Ash Cement in Mining Backfill Material,” Proceedings of International Symposium on Mine Planning & Equipment Selection, Kalgoorlie, April 2003, pp. 199-204.
[12]
Y. Yoshida, H. Shimada, J. Gottfried, M. Iino, K. Matsui, M. Ichinose, S. Fujita, M. Mineshita, T. Mizunuma, T. Kawai and E. Sakai, “Application of Injection Material for Rehabilitation of Pipeline Using Fly Ash-Surfactant Mixtures,” Proceedings of 10th Conference on Environment and Mineral Processing, Ostrava, 2006, Vol. 1, pp. 93-100.
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R. H. Karol, “Chemical Grouting and Soil Stabilization,” 2003.
