Reducing concrete permeability by using natural pozzolans and reduced aggregate-to-pasteratio
Improved durability of concrete is mainly achieved with low-permeability. Permeability depends on permeability of the bulk cement paste (CP) and that of its interfacial transition zone (ITZ). Even though permeability of CP is well understood and can be adequately controlled, permeability of ITZ is n...
| Main Authors: | , , , |
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| Format: | Article |
| Language: | English |
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Vilnius Gediminas Technical University
2015-01-01
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| Series: | Journal of Civil Engineering and Management |
| Subjects: | |
| Online Access: | http://journals.vgtu.lt/index.php/JCEM/article/view/2984 |
| _version_ | 1818876928568852480 |
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| author | Fernando Bustos Patricia Martinez Carlos Videla Mauricio Lopez |
| author_facet | Fernando Bustos Patricia Martinez Carlos Videla Mauricio Lopez |
| author_sort | Fernando Bustos |
| collection | DOAJ |
| description | Improved durability of concrete is mainly achieved with low-permeability. Permeability depends on permeability of the bulk cement paste (CP) and that of its interfacial transition zone (ITZ). Even though permeability of CP is well understood and can be adequately controlled, permeability of ITZ is not well understood yet. This paper shows that minimizing permeability of concrete requires minimizing permeability of CP by using a supplementary cementing material (SCM) such as natural pozzolans (NP) and minimizing ITZ by reducing aggregate content until maximum cement content. This was done by comparing performance of concrete made with ordinary Portland cement (OPC) and blended cement (OPC+NP) at the same w/b, and by comparing performance of concrete with different amount of ITZ at the same w/b. All of this was performed through testing of mechanical properties, air permeability, sorptivity, chloride ion diffusion, and aggregate specific surface. Results show that NP reduced air permeability by 84% and chloride ion diffusion by 66%, but increased sorptivity up to 140%. ITZ has an important effect in all properties; especially in air permeability where sensitive reduction of more than a 90% was achieved. ITZ effect seems to be as important as using SCMs in improving durability of concrete. |
| first_indexed | 2024-12-19T13:50:11Z |
| format | Article |
| id | doaj.art-3c6983ae5a4a4b57be4dcc2d4b5dd7d8 |
| institution | Directory Open Access Journal |
| issn | 1392-3730 1822-3605 |
| language | English |
| last_indexed | 2024-12-19T13:50:11Z |
| publishDate | 2015-01-01 |
| publisher | Vilnius Gediminas Technical University |
| record_format | Article |
| series | Journal of Civil Engineering and Management |
| spelling | doaj.art-3c6983ae5a4a4b57be4dcc2d4b5dd7d82022-12-21T20:18:45ZengVilnius Gediminas Technical UniversityJournal of Civil Engineering and Management1392-37301822-36052015-01-0121210.3846/13923730.2013.802719Reducing concrete permeability by using natural pozzolans and reduced aggregate-to-pasteratioFernando Bustos0Patricia Martinez1Carlos Videla2Mauricio Lopez3Department of Construction Engineering and Management, School of Engineering, Pontificia Universidad Catolica de Chile, Santiago, ChileSchool of Engineering, Universidad de Valparaiso, Valparaiso, ChileDepartment of Construction Engineering and Management, School of Engineering, Pontificia Universidad Catolica de Chile, Santiago, ChileDepartment of Construction Engineering and Management, School of Engineering, Pontificia Universidad Catolica de Chile, Santiago, ChileImproved durability of concrete is mainly achieved with low-permeability. Permeability depends on permeability of the bulk cement paste (CP) and that of its interfacial transition zone (ITZ). Even though permeability of CP is well understood and can be adequately controlled, permeability of ITZ is not well understood yet. This paper shows that minimizing permeability of concrete requires minimizing permeability of CP by using a supplementary cementing material (SCM) such as natural pozzolans (NP) and minimizing ITZ by reducing aggregate content until maximum cement content. This was done by comparing performance of concrete made with ordinary Portland cement (OPC) and blended cement (OPC+NP) at the same w/b, and by comparing performance of concrete with different amount of ITZ at the same w/b. All of this was performed through testing of mechanical properties, air permeability, sorptivity, chloride ion diffusion, and aggregate specific surface. Results show that NP reduced air permeability by 84% and chloride ion diffusion by 66%, but increased sorptivity up to 140%. ITZ has an important effect in all properties; especially in air permeability where sensitive reduction of more than a 90% was achieved. ITZ effect seems to be as important as using SCMs in improving durability of concrete.http://journals.vgtu.lt/index.php/JCEM/article/view/2984durabilitynatural pozzolanstransport mechanismsair-permeabilitysorptivitychlorides |
| spellingShingle | Fernando Bustos Patricia Martinez Carlos Videla Mauricio Lopez Reducing concrete permeability by using natural pozzolans and reduced aggregate-to-pasteratio Journal of Civil Engineering and Management durability natural pozzolans transport mechanisms air-permeability sorptivity chlorides |
| title | Reducing concrete permeability by using natural pozzolans and reduced aggregate-to-pasteratio |
| title_full | Reducing concrete permeability by using natural pozzolans and reduced aggregate-to-pasteratio |
| title_fullStr | Reducing concrete permeability by using natural pozzolans and reduced aggregate-to-pasteratio |
| title_full_unstemmed | Reducing concrete permeability by using natural pozzolans and reduced aggregate-to-pasteratio |
| title_short | Reducing concrete permeability by using natural pozzolans and reduced aggregate-to-pasteratio |
| title_sort | reducing concrete permeability by using natural pozzolans and reduced aggregate to pasteratio |
| topic | durability natural pozzolans transport mechanisms air-permeability sorptivity chlorides |
| url | http://journals.vgtu.lt/index.php/JCEM/article/view/2984 |
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