加速鋰離子傳輸技術的施加電流密度與陽離子傳輸參數關係

Relationship between Cations Migration Parameters and Current Density of Accelerated Lithium Migration Technique

王韡蒨(Wei-Chien Wang) ； 劉志堅(Chih-Chien Liu) ； 李釗(Chau Lee)

《中國土木水利工程學刊》 23卷3期 (2011/09) Pp. 307-316

https://doi.org/10.6652/JoCICHE.201109_23(3).0007

摘要

使用直徑10 cm高度3及5 cm砂漿試體，粒料水泥比2.25，水灰比0.5，細粒料級配符合ASTM C227要求，以NaOH調整水泥含鹼量至2.0% Na2Oeq，養護3個月後施加6~21 A/m^2定電流密度，進行加速鋰離子傳輸技術（ALMT）試驗。試驗結果顯示，Na+及K+移出完成所需時間與Li+穿過試體時間，均隨施加電流增加而縮減。施加6 A/m^2 定電流密度，可移出約87%試體內的鹼質，增加電流密度對鹼質移出的增加量有限，但卻可以縮短移出完成所需時間。提高電流密度可增加施加電量用於陽離子傳輸的比例，平均每增加1 A/m^2 電流密度，可增加約0.0011~0.0012 的陽離子遷移數和，減少試體長度可提高施加電量用於陽離子傳輸的比例。

關鍵字

鹼－矽反應 ； 電化學技術 ； 傳輸 ； 電流密度

並列摘要

10 cm-diameter, 3 and 5 cm-high mortar specimens were used, with an aggregate/cement ratio of 2.25, water/cement ratio of 0.5, and fine aggregate gradation conforming to the requirements of ASTM C227. The alkali content of the cement was adjusted by NaOH to be 2.0% Na2Oeq. After curing for three months, 6 ~ 21 A/m^2 constantcurrent- density Acceleration Lithium Migration Technique (ALMT) experiments were performed. As indicated by the experimental results, the system resistance of the ALMT experiment is proportional to the length of specimen. The Na+ and K+ complete removal time and the time for Li+ passing through the specimen were decresed with increasing current density. The applied constant current density of 6 A/m2 can remove about 87% alkali in the specimen. Increasing the current density, the increment of removed alkali is limit, but it can reduce the complete removal time. The increased applied current density is conducive to the increased proportion of the applied current applied for cation migration. The 0.0011 ~ 0.0012 cation transference numbers can be increased for every 1 A/m2 increase of current density. Shorter specimen length can increase the proportion of the applied current applied for cation migration.

並列關鍵字

alkali-silica reaction ； electrochemical technique ； migration ； current density