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http://dx.doi.org/10.14481/jkges.2021.22.12.15

Compressional and Shear Wave Properties of Cement Grout Including Carbon Fiber  

Choi, Hyojun (Department of Civil & Environmental Engineering, Dankook University)
Cho, Wanjei (Department of Civil & Environmental Engineering, Dankook University)
Yune, Chanyoung (Department of Civil Engineering, Gangneung Wonju National University)
Publication Information
Journal of the Korean GEO-environmental Society / v.22, no.12, 2021 , pp. 15-24 More about this Journal
Abstract
In Korea, which is mostly mountainous, the proportion of tunnel and underground space development are increasing. Although the ground is reinforced by applying the ground improvement method during underground space development, accidents still occur frequently in Korea. In the grouting method, a representative ground reinforcement method, the effect was judged by comparing the total amount of injection material with the amount of injection material used during the actual grouting construction. However, it is difficult to determine whether the ground reinforcement is properly performed during construction or within the target ground. In order to solve this problem, it is necessary to study a new method for quality control during or after construction by measuring electrical resistivity after performing grouting by mixing carbon fiber, which is a conductive material, and microcement, which is a grout material. In this study, as a basic study, a cement specimen mix ed with 0%, 3%, 5%, 7% of carbon fiber was prepared to evaluate the performance of the grout material mixed with carbon fiber, which is a conductive material. The prepared specimens were wet curing for 3 days, 7 days, and 28 days under 99% humidity, and then compression wave velocity and shear wave velocity were measured. As a result of the compression wave velocity and shear wave velocity measurement, it showed a tendency to increase with the increase in the compounding ratio of carbon fibers and the number of days of age, and it was confirmed that the elastic modulus and shear modulus, which are the stiffness of the material, also increased.
Keywords
Grouting; Micro-cement; Carbon fiber; Compressional wave; Shear wave; Young's modulus; Shear modulus;
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