Accelerated carbonation testing of alkali-activated slag/metakaolin blended concretes: effect of exposure conditions
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- 作者：Susan A. Bernal ; John L. Provis ; Ruby Mejía de Gutiérrez…
- 关键词：Alkali ; activated cement ; Concrete ; Granulated blast ; furnace slag ; Carbonation ; Durability
- 刊名：Materials and Structures
- 出版年：2015
- 出版时间：March 2015
- 年：2015
- 卷：48
- 期：3
- 页码：653-669
- 全文大小：731 KB
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20. Bernal SA, Pr - 作者单位：Susan A. Bernal (1) (2)
John L. Provis (2)
Ruby Mejía de Gutiérrez (1)
Jannie S. J. van Deventer (3) (4)
1. School of Materials Engineering, Composite Materials Group, CENM, Universidad del Valle, Cali, Colombia
2. Department of Materials Science and Engineering, University of Sheffield, Sir Robert Hadfield Building, Mappin St., Sheffield, S1 3JD, UK
3. Zeobond Pty Ltd., P.O. Box 23450, Docklands, VIC, 8012, Australia
4. Department of Chemical and Biomolecular Engineering, University of Melbourne, Parkville, VIC, 3010, Australia - 刊物类别：Engineering
- 刊物主题：Structural Mechanics
Theoretical and Applied Mechanics
Mechanical Engineering
Operating Procedures and Materials Treatment
Civil Engineering
Building Materials - 出版者：Springer Netherlands
- ISSN：1871-6873
文摘
This paper addresses the effects of relative humidity (RH) and carbon dioxide (CO2) concentration on the rate and effects of accelerated carbonation in alkali-activated slag/metakaolin (MK) concretes. Strength and water absorption are used alongside phenolphthalein measurements to monitor carbonation, and the effects of drying at different RHs are particularly significant in controlling carbonation rates. Different trends in the carbonation rate as a function of MK content are observed when varying the CO2 concentration, further revealing that the carbonation rates of these materials under accelerated conditions are influenced strongly by the testing protocol. The standard phenolphthalein method for testing carbonation depth appears only to be capturing the change in alkalinity with pore solution carbonation, meaning that it does not correlate well with other performance parameters at high CO2 concentrations.