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Experimental Study for Actual Construction of Thixotropic Grout Material
PC grout is roughly classified into high and low viscosity types. The high viscosity type cannot be pumped over a long distance at once because of the increase in grouting pressure, and the low viscosity type has problem of filling failure due to the flow ahead of the phenomenon on the downslope. Therefore, thixotropic grout materials have been developed to improve the workability and filling properties of PC grout, focusing on the thixotropic properties in which the viscosity changes between when pressurized and when normal. This paper reports the results of confirmation tests conducted for the practical application of thixotropic grout materials. The test was conducted on a mock-up model test simulating the actual PC steel strand arrangement, and a grouting test was performed in the case of using both a pressure pump and vacuum pump, and the case of using only a pressure pump. After the grout hardens, the duct is removed, and the filling status inside is checked. In the test, the pressure of the pressure pump was recorded and compared with high viscosity materials and ultra-low viscosity materials that are currently on the market and are frequently used. At the time of the test the bleeding ratio, expansion ratio, and stability tests were conducted.
Experimental Study for Actual Construction of Thixotropic Grout Material
PC grout is roughly classified into high and low viscosity types. The high viscosity type cannot be pumped over a long distance at once because of the increase in grouting pressure, and the low viscosity type has problem of filling failure due to the flow ahead of the phenomenon on the downslope. Therefore, thixotropic grout materials have been developed to improve the workability and filling properties of PC grout, focusing on the thixotropic properties in which the viscosity changes between when pressurized and when normal. This paper reports the results of confirmation tests conducted for the practical application of thixotropic grout materials. The test was conducted on a mock-up model test simulating the actual PC steel strand arrangement, and a grouting test was performed in the case of using both a pressure pump and vacuum pump, and the case of using only a pressure pump. After the grout hardens, the duct is removed, and the filling status inside is checked. In the test, the pressure of the pressure pump was recorded and compared with high viscosity materials and ultra-low viscosity materials that are currently on the market and are frequently used. At the time of the test the bleeding ratio, expansion ratio, and stability tests were conducted.
Experimental Study for Actual Construction of Thixotropic Grout Material
Lecture Notes in Civil Engineering
Barros, Joaquim A. O. (editor) / Cunha, Vítor M. C. F. (editor) / Sousa, Hélder S. (editor) / Matos, José C. (editor) / Sena-Cruz, José M. (editor) / Itoh, Hiraku (author) / Fujiwara, Hiromi (author)
FIB International Conference on Concrete Sustainability ; 2024 ; Guimarães, Portugal
4th fib International Conference on Concrete Sustainability (ICCS2024) ; Chapter: 30 ; 245-253
2024-12-29
9 pages
Article/Chapter (Book)
Electronic Resource
English
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