A Study of the Applications of the Electrochemical Dehumidification Method on the Concrete Members

View Statistics Email Alert RSS Feed

Information

Details

Project title

Code/計畫編號

MOST103-2221-E019-053-MY3

Translated Name/計畫中文名

電化學除濕法應用於混凝土構件之研究

Project Coordinator/計畫主持人

Wei-Chung Yeih

Funding Organization/主管機關

National Science and Technology Council

Co-Investigator(s)/共同執行人

張建智

Department/Unit

Department of Harbor and River Engineering

Website

https://www.grb.gov.tw/search/planDetail?id=11280013

Year

2015

Start date/計畫起

01-08-2015

Expected Completion/計畫迄

31-07-2016

Co-Investigator(s)

Jiang-Jhy Chang

Bugetid/研究經費

662千元

ResearchField/研究領域

土木水利工程

"本計畫擬針對電化學除濕法進行一系列的研究。所謂的電化學除濕，乃是利用電極若處於陰極時或是鈍態的陽極(即陽極材料的氧化能力較電解液差)，則產生電解水的反應，使得水氣下降。為瞭解此法應用於混凝土上的成效，提出數個變數加以考量，分別為電流形態(交流電或是直流電)、電解液是否須添加、外設電極板的佈設、直流電電壓、交流電電壓以及頻率，透過這些變數設計，瞭解對混凝土除濕的影響。電化學除濕的成效以電流量變化、混凝土內濕度改變來評估，並在除濕完成以後，加以塗封杜絕水氣交換，然後量測電化學腐蝕訊號，瞭解除濕以後對於鋼筋腐蝕的助益為何。試驗完成以後，進行破壞，觀察在通電過程中是否造成鋼筋腐蝕；並針對有加氯鹽的試體，取樣量測氯離子分佈狀況，以瞭解通電對於含有氯離子的混凝土是否能夠同時達到除濕以及除鹽的效果。本計畫擬分為三年期計畫，各年期主要重點為: 1. 第一年: 單筋佈設，並以單筋作為電極使用。在這一年期計畫當中，最重要的觀測是除濕是否只發生在單筋與外接極板之間。另外交流電通電是否會讓單筋產生銹蝕也是關心的重點之一。 2. 第二年: 鋼筋籠佈設，形成電通路，接為電極使用。在這一年期的計畫當中，我們將瞭解除濕是否只發生在鋼筋籠與外接極板之間，也就是保護層上。 3. 第三年: 鋼筋籠佈設，但在混凝土內佈設輔助石墨電極，將電路接在輔助電極與外接極板上，也就是說鋼筋籠並不在電路上。我們希望瞭解如此佈設是否有更好的除濕以及除鹽的效果。預計本計畫完成之後，我們可以提供數據給國內工程界在進行電化學除濕工法設計上的參考，而輔助電極式電化學除濕工法可以提出專利申請。 " "A three-year project is proposed to conduct a series of study on the electrochemical dehumidification method. The so-called electrochemical dehumidification method happens when the electrode plays as a cathode or a passive anode, where the oxidation capability of the anode material is worse than the electrolyte, and the final reaction becomes the electrolysis of water which results in reduction of humidity. In order to know how this method can be applied to concrete structures, several variables are considered including the type of current (DC or AC), whether or not adding the electrolyte, arrangement of electrodes outside the concrete, DC voltage and AC voltage and its frequency. Through a complete study on the influences of these variables, the efficiency of electrochemical dehumidification method can be investigated. The efficiency can be evaluated by the current decay and humidity inside concrete. After the process is completed, the specimens will be coated to prevent water and vapor exchange between concrete and the environment. Then the electrochemical corrosion measurements will be conducted to understand how the corrosion of rebar will be inhibited after the dehumidification process. After the electrochemical measurements are fulfilled, the rebar inside concrete will be taken out to examine whether or not the electrochemical dehumidification process results in corrosion of rebar. In addition, for specimens containing chlorides, the chloride ion distribution will be studied in order to know whether or not the dehumidification and desalination can be fulfilled at the same time. This project is proposed to be completed in three years, and the main focus for each year is listed as the followings: 1. The first year: the single rebar is arranged inside the concrete and it plays as one of the electrodes. In this year, we concern whether or not the dehumidification occurs between the electrodes. In addition, whether or not the AC will result in rebar corrosion is also a focus. 2. The second year: the steel reinforcement cage is arranged inside the concrete and it plays as one the electrodes. In this year, we want known whether or not the dehumidification mainly happens between the cage and the outside electrodes, i.e., the concrete cover. 3. The third year: the steel reinforcement cage is arranged inside the concrete but it does not connected to the electric path. Instead of using reinforcements as electrodes inside concrete, the graphite electrodes will be arranged inside concrete to play as the auxiliary electrodes. We hope to understand whether or not this arrangement can fulfill the dehumidification and desalination at the same time. It is expected that after fulfillment of this project, a series of data can provide guideline for domestic engineers in designing the electrochemical dehumidification process. In addition, we will apply the patent for the electrochemical dehumidification process with the auxiliary electrodes . "

Keyword(s)

電化學除濕
交流電
直流電
除鹽
electrochemical dehumidification
alternative current
direct current
desalination

DSpace CRIS

A Study of the Applications of the Electrochemical Dehumidification Method on the Concrete Members

Details

Description