The Test Method for Concrete Durability-Modified the RCPT Specimes Pre-Treatment

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簡歷

基本資料

Project title

Code/計畫編號

MOST104-2221-E019-049

Translated Name/計畫中文名

混凝土耐久性試驗法-RCPT試體前處理之改良

Project Coordinator/計畫主持人

Chung-Chia Yang

Funding Organization/主管機關

National Science and Technology Center for Disaster Reduction

Department/Unit

Institude of Optoelectronic Sciences

Website

https://www.grb.gov.tw/search/planDetail?id=11586277

Year

2015

Start date/計畫起

01-08-2015

Expected Completion/計畫迄

31-07-2016

Bugetid/研究經費

698千元

ResearchField/研究領域

土木水利工程
材料科技

快速氯離子滲透試驗(RCPT)，常用於混凝土的耐久性試驗，因其試驗方式快速且經濟。但在試驗過程中，所測得之電流並非全是因氯離子在傳輸，然而添加飛灰的混凝土在水化過程中會消耗部分的氫氧根離子，導致總電量較低，進而影響評估標準。本研究主要探討，若將試體以外加電場方式使試體充滿氯離子後，進行RCPT並累積總電量與一般RCPT總電量、滲透深度、總氯離子含量比較其中關係，藉由此方式減少其他離子，探討是否能改善電量錯估問題。RCPT結果顯示，水膠比越高的試體電量、滲透深度、總氯離子含量皆會越大，抵抗氯離子評估則變差。飛灰取代水泥時，可填補試體中的孔隙，使混凝土更加緻密，對抵抗氯離子方面有較好的影響。研究中顯示，電量、滲透深度、總氯離子含量皆有下降，但與對照組相比仍有一段不小的截距差，導致以電量方式評估失準。藉由試體飽和氯離子之試體進行RCPT，並累積總電量後與一般RCPT各試驗數據比較後，水膠比較高之試體，因高溫劣化，導致電流上升過快，故本研究將對照組NSC-RCPT之電量降低30%之結果，成為assume OPC。assume OPC與飛灰組之間比較，兩者之間截距差有明顯縮小，但仍無法使對照組與飛灰組兩條線重合，無法完全修正電量方式評估失準的情況。本研究推測即使先將試體飽和離子，再進行RCPT，試體仍會析出其他離子，而非單單只有氯離子。 Rapid Chloride Permeability Test (RCPT) is usually used to examine concrete durability, because it is faster and more economical. But in the testing process, the current is not only measured by chloride ions. However, adding fly ash concrete in the hydration process always consume part of hydroxide ions, resulting in a lower total power, thereby affecting the assessment criteria. This study was going to find out the relationship between total charge, penetration depth and total chloride ions content based on None Saturated Chloride-RCPT (NSC-RCPT) and Saturated Chloride-RCPT (SC-RCPT). The result of RCPT shows that W/B proportional to total charge, penetration depth and total chloride ion content. And assessment concrete resistance to chloride ion is reduced. C-S-H colloid and C-A-H hydrate will product during hydration process at fly ash replaced cement, it can fill the void of sample to make it become dense, which could increase concrete resistance to chloride ion. This study shows that total charge, penetration depth and total chloride ion content are decrease, but there is still a big difference to control group thereby affecting the assessment criteria. Comparing the results between NSC-RCPT and SC-RCPT, the controlled group SC-RCPT result that current and temperature are increase with high W/B, this study uses the assume OPC which NSC-RCPT current reduce 30% replace SC-RCPT. The intercept difference between the assume OPC and fly ash group are closed but still could not coincide these two line. This study speculates that even if the simple saturated chloride ions, another ions will still isolate from simple in RCPT, not just only chloride ions.

Keyword(s)

快速氯離子滲透試驗
混凝土
礦物摻料
電
Rapid chloride permeability test
Concrete
Supplementary cementing materials
Charge passed

DSpace CRIS

The Test Method for Concrete Durability-Modified the RCPT Specimes Pre-Treatment

基本資料

Description