Abstract
The grouting is used to reinforce soft ground and to prevent the leakage of water in the soil. The objective of the study is to enhance the compressive strength of grout materials by using reinforcing fibers and to increase the strength of soil using blast furnace slag powder. For this purpose, cement was replaced with the blast furnace slag powder by 30 to 60%. Furthermore, for comparison of carbon fibers with aramid fibers, each fiber was added by 0, 0.5, and 1.0% of the weight of material. As the contents of carbon fibers and aramid fibers increased, the uniaxial compressive strength increased. This is due to the interlocking of fibers in the grout material that increased the uniaxial compressive strength. Moreover, the grout material reinforced with aramid fibers showed an increase of uniaxial compressive strength by at least 20% compared to the carbon fibers. An environmental assessment was done through a heavy metal leaching test and a pH test. The test result reveals that about 50% of chromium (VI) leaching decreased as 30% more blast furnace slag powder was used but the pH test shows about 0.5 pH increased as 30% more blast furnace slag powder was used. Further study is necessary for the pH test.
Highlights
Background andObjective e grouting method is generally used for reinforcing unstable slopes and stopping water leaks in embankments or dams
As the aramid fibers and the carbon fibers as reinforcing fibers in the specimen are not related to pH like the heavy metal leaching test, the pH test was conducted with an increase in the contents of blast furnace slag powder
Results from Testing Uniaxial Compressive Strength according to Mixing Ratio of OPC : B
Summary
Kim [31] studied reinforced concrete mixed with aramid fibers, and Yang [32] studied the reinforcement effect of the grouting method for using aramid fibers. E metaaramid fibers are very good in terms of high-temperature resistance, and the para-aramid fibers are very elastic and strong. E PAN-based carbon fibers have properties of high strength and high elasticity through thermal stabilization and carbonization for precursors (polyacrylonitrile fibers) and are widely used for materials in the aerospace and other industries, sports, and leisure industry. E blast furnace slag powder has advantages of reducing the speed of hydration heat generation, inhibiting rising concrete temperature, improving long-term strength, improving water tightness, inhibiting corrosion of reinforcing bars by preventing chloride-ion penetration, improving chemical resistance by sulfate, inhibiting alkali reaction, and facilitating flow. The blast furnace slag powder is generally used as blast furnace cement in Korea, it is necessary to use the ideal properties of blast furnace slag powder more efficiently and to design specifications of the blast furnace slag powder and use it as a mixing material for concrete
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