電滲法運用於抑制鹼質與粒料反應之基礎研究

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題名:	電滲法運用於抑制鹼質與粒料反應之基礎研究
作者:	蘇銘鴻;Ming-Hong Su
貢獻者:	土木工程研究所
關鍵詞:	電滲法;鹼質與粒料反應;鋰離子;電流密度
日期:	2002-05-29
上傳時間:	2009-09-18 17:12:20 (UTC+8)
出版者:	國立中央大學圖書館
摘要:	本研究主要利用電化學技術，在電場作用下快速將鋰離子送進具有鹼質與粒料膨脹反應潛勢的混凝土試體內，同時將試體內的鈉、鉀離子驅趕出試體，探討通電試體對抑制鹼質與粒料反應的成效，以作為日後能應用於實務上之基礎研究。本試驗的通電模式主要模擬ASTM C1202的試驗程序，在固定通電條件下，針對不同混凝土配比條件（包括水灰比、含鹼當量及粒料活性）、試體長徑比、電流密度、陽極電解液種類及試體齡期等參數變化，一一探討其對通電成效的影響。研究結果顯示，在電場作用下，可快速的將鋰離子送進混凝土試體內，亦可將大部份的游離態鈉離子驅趕出試體。另外分析通電結果，試驗所探討的各項參數皆明顯影響通電的效果。但由於通電過程中，氫氧化鈣於孔隙溶液中大量沉澱，導致混凝土阻抗增加，因此隨著通電時間的增加，通電的效果越差。不過就整體而言，可預期經過通電處理的混凝土試體對抑制鹼質與粒料反應有一定程度的效果。 The purpose of this research is to drive lithium ions quickly into the concrete specimens and remove sodium ions and potassium ions form the concrete specimens at the same time under the influence of an externally applied electrical field. The main discussion is about the inhibiting effect of alkali aggregate reaction after concrete specimens were subjected to an electrochemical technique treatment. The experimental procedure is principally to simulate ASTM C1202. In this study, five main influence factors are investigated: different of concrete mix design, dimensions of concrete specimens, current density, the combination type of electrolyte and curing period of concrete specimens. Results showed that this test utilized a applied potential difference （9 A/m2 current density）can accelerate the transport of lithium ions into or through concrete specimens. Moreover, almost all of free sodium ions were driven out from concrete specimens. Due to a large amount of Ca(OH)2 precipitated during electric treatment, which may have caused its increased resistance to molecular or ions transport. Therefore, the effect of ions transport was getting worse after a time. Overall, it is predicted that concrete specimens treated will inhibit alkali aggregate reaction effectively.
顯示於類別:	[土木工程研究所] 博碩士論文

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