The Practical Application of Two-Dimensional Electric Field Accelerated Lithium Migration Technique

• Main Authors: Jhih Yuan Hu, 胡志遠
• Other Authors: Wen-Ten Kuo
• Format: Others
• Language: zh-TW
• Published: 2014
• Online Access: http://ndltd.ncl.edu.tw/handle/zs37xf

碩士 === 國立高雄應用科技大學 === 土木工程與防災科技研究所 === 102 === This research discusses the practical application simulation of 2-D Accelerated Lithium Migration Technique (ALMT), and the inhibited performance of ASR for different electrode design. To simulate three types of electrode module using in practical application: face-face, face-line, and line-line. To adjust the alkali content of concrete using NaOH to 1.25％ Na2Oeq. After one month curing at room temperature, then proceed the 60 V constant voltage ALMT test for one month. LiNO3 and LiOH．H2O solutions are used as anolyte, and using two kinds of concentration: 0.5 N and 1.0 N. After ALMT testing, the specimens are placed in the environment of ASTM C1293 (38℃, 100% R.H.) and to monitor the variation of expansion. The results show that the initial current of three types of module is high, and then reducing gradually. Face-line module had the lowest reducing rate. The electrolyte volume of line-line module is small, the electrolyte is easy reduce for the reason such as evaporation and electroosmosis, so lowing the performance of electrifying. The higher charge is helpful for removing the alkali out of concrete and driving lithium into concrete. The ion migration is uniform for Face-face and face-line modules, line-line module has some invalid area of ion migration. The average residual amount of alkali for three modules from low to high is face-line, face-face, and line-line, the performance of face-line is best. The average free Li/(Na+K) molar ratio for three modules from high to low is face-line, line-line, and face-face, the performance of face-line is best. From the observing of the expansion amount of specimen, face-line module is lowest and line-line is highest. The higher concentration of anolyte is good for removing alkali out of concrete, but is not good for driving lithium into concrete.