Controll of Alkali-Silica Expantion by Lithium Ion Pressurized Injection Method
Kazunori ERA, Takafumi MIHARA, Shigeyuki OKADA and Toyoaki MIYAGAWA
Abstract:Recently, lithium ion pressurized injection method has been spotlighted as the repair method of concrete structure which deteriorated by ASR. In applying this method to established structures, it is important to set up suitable pressure and suitable period according to the degradation grade of concrete. Then, it considered that the fall of compressive strength or modulus of elasticity was the degradation grade of concrete, and authors proposed the calculation formula which presumes a injection period from compressive strength or modulus of elasticity. This method was applied to the retaining wall. After applying this method to the retaining wall , the concrete core was extracted and the promotion expansion examination was carried out. Consequently, it was shown by injecting in lithium ion in suitable pressure and a suitable period that the effect which controls expansion is expectable. Key Words:ASRCLithium nitriteCPressurized injectionCInjection periodCResidual expansion