• The Journal of the Convergence on Culture Technology
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• v.9 no.5
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• pp.557-562
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• 2023

This study reviewed the use of soil injection materials using circulating resources as injection materials for the steel pipe multi-stage construction method. The tests performed were homogel time and homogel compressive strength. The steel pipe multi-stage construction method is an auxiliary construction method for tunnels, and the expression of initial strength after construction is an important factor. The better the strength development in the initial stage, the more it can be used as an injection material suitable for the multi-stage steel pipe construction method. As a result of laboratory test, it was found that the homogel time of the injection material using circulating resources required more time than the mixing ratio using cement as the injection material. In addition, it was found that the initial strength curing time satisfying 2MPa was required for more than 24 hours. Therefore, it was confirmed that the injection material using recycled resources required a longer initial curing time than cement of the same mixing ratio.

• The Journal of the Convergence on Culture Technology
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• v.10 no.6
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• pp.591-596
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• 2024

In this study, a gel time test in laboratory test and a homogel compressive strength test for each curing day were conducted to compare low cement injection materials utilizing recycled resources as replacement materials for OPC and SC used in the SGR method. In the case of the gel time test, OPC and SC showed results that satisfied the quick setting and final setting conditions presented in the standard mixing ratio. In the case of low cement injection material utilizing recycled resources, the gel time under quick setting conditions was not satisfied. As a result of conducting a gel time test of low cement injection material using recycled resources under quick setting conditions using a modified mixing ratio, the average time was found to be 8.8 sec, confirming that it satisfies the quick setting conditions. In addition, as a result of measuring the homogel compressive strength with a mixing ratio that satisfies the gel time conditions, the compressive strength was found to be 1.12-1.88 MPa as of the 28th day.