Influence of metakaoline on the chloride penetration performance of concrete

Miguel Ferreira, João Castro-Gomes, Pedro Costa, Raphaele Malheiro

Research output: Chapter in Book/Report/Conference proceedingConference abstract in proceedingsScientific

Abstract

Extensive research and practical experience have shown that partial replacement of cement by metakaolin improves concrete durability as a result of the refinement of the pore structure. While literature confirms much research on the performance of concrete with metakaolin, it is scarce concerning the performance with regards to chloride penetration, and the effect on the service life of reinforced concrete structures. In this study, several concrete mixes were cast with varying cement type and content and were evaluated for their chloride penetration performance. Reference mixes where made with CEM I 42,5R and CEM IV/A 42,5 type cements. Two cement contents levels where defined: 330 kg/m3 and 440 kg/m3 based on mix designs currently used in the ready-mix industry for C20/25 and C30/37 concretes. Cement was replaced with metakaolin with levels varying from 10 - 20%. All concretes where tested for fresh properties, compressive strength, electrical resistivity and chloride diffusion characteristics (migration and ponding), and mercury intrusion porosimetry. The results demonstrate the improved resistance to chloride penetration of concretes with metakaolin additions. A beneficial effect on strength and durability properties of metakaolin was also observed. In addition, service life design calculations of reinforced concrete structures in marine environment based on the performance indicators obtained show a significant increase in the time to fulfil the serviceability limit state of corrosion initiation
Original languageEnglish
Title of host publicationICDC 2012, International Congress on Durability of Concrete
Place of PublicationTrondheim, Norway
Publication statusPublished - 2012
EventInternational Congress on Durability of Concrete, ICDC 2012 - Trondheim, Norway
Duration: 18 Jun 201221 Jun 2012

Conference

ConferenceInternational Congress on Durability of Concrete, ICDC 2012
Abbreviated titleICDC 2012
CountryNorway
CityTrondheim
Period18/06/1221/06/12

Fingerprint

Cements
Concretes
Concrete construction
Service life
Reinforced concrete
Durability
Ponding
Concrete mixtures
Pore structure
Compressive strength
Corrosion
Industry

Keywords

  • durability
  • metakaolin
  • chloride
  • electrical resistivity
  • service life
  • addition

Cite this

Ferreira, M., Castro-Gomes, J., Costa, P., & Malheiro, R. (2012). Influence of metakaoline on the chloride penetration performance of concrete. In ICDC 2012, International Congress on Durability of Concrete Trondheim, Norway.
Ferreira, Miguel ; Castro-Gomes, João ; Costa, Pedro ; Malheiro, Raphaele. / Influence of metakaoline on the chloride penetration performance of concrete. ICDC 2012, International Congress on Durability of Concrete. Trondheim, Norway, 2012.
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Ferreira, M, Castro-Gomes, J, Costa, P & Malheiro, R 2012, Influence of metakaoline on the chloride penetration performance of concrete. in ICDC 2012, International Congress on Durability of Concrete. Trondheim, Norway, International Congress on Durability of Concrete, ICDC 2012, Trondheim, Norway, 18/06/12.

Influence of metakaoline on the chloride penetration performance of concrete. / Ferreira, Miguel; Castro-Gomes, João; Costa, Pedro; Malheiro, Raphaele.

ICDC 2012, International Congress on Durability of Concrete. Trondheim, Norway, 2012.

Research output: Chapter in Book/Report/Conference proceedingConference abstract in proceedingsScientific

TY - CHAP

T1 - Influence of metakaoline on the chloride penetration performance of concrete

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AU - Castro-Gomes, João

AU - Costa, Pedro

AU - Malheiro, Raphaele

PY - 2012

Y1 - 2012

N2 - Extensive research and practical experience have shown that partial replacement of cement by metakaolin improves concrete durability as a result of the refinement of the pore structure. While literature confirms much research on the performance of concrete with metakaolin, it is scarce concerning the performance with regards to chloride penetration, and the effect on the service life of reinforced concrete structures. In this study, several concrete mixes were cast with varying cement type and content and were evaluated for their chloride penetration performance. Reference mixes where made with CEM I 42,5R and CEM IV/A 42,5 type cements. Two cement contents levels where defined: 330 kg/m3 and 440 kg/m3 based on mix designs currently used in the ready-mix industry for C20/25 and C30/37 concretes. Cement was replaced with metakaolin with levels varying from 10 - 20%. All concretes where tested for fresh properties, compressive strength, electrical resistivity and chloride diffusion characteristics (migration and ponding), and mercury intrusion porosimetry. The results demonstrate the improved resistance to chloride penetration of concretes with metakaolin additions. A beneficial effect on strength and durability properties of metakaolin was also observed. In addition, service life design calculations of reinforced concrete structures in marine environment based on the performance indicators obtained show a significant increase in the time to fulfil the serviceability limit state of corrosion initiation

AB - Extensive research and practical experience have shown that partial replacement of cement by metakaolin improves concrete durability as a result of the refinement of the pore structure. While literature confirms much research on the performance of concrete with metakaolin, it is scarce concerning the performance with regards to chloride penetration, and the effect on the service life of reinforced concrete structures. In this study, several concrete mixes were cast with varying cement type and content and were evaluated for their chloride penetration performance. Reference mixes where made with CEM I 42,5R and CEM IV/A 42,5 type cements. Two cement contents levels where defined: 330 kg/m3 and 440 kg/m3 based on mix designs currently used in the ready-mix industry for C20/25 and C30/37 concretes. Cement was replaced with metakaolin with levels varying from 10 - 20%. All concretes where tested for fresh properties, compressive strength, electrical resistivity and chloride diffusion characteristics (migration and ponding), and mercury intrusion porosimetry. The results demonstrate the improved resistance to chloride penetration of concretes with metakaolin additions. A beneficial effect on strength and durability properties of metakaolin was also observed. In addition, service life design calculations of reinforced concrete structures in marine environment based on the performance indicators obtained show a significant increase in the time to fulfil the serviceability limit state of corrosion initiation

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KW - chloride

KW - electrical resistivity

KW - service life

KW - addition

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BT - ICDC 2012, International Congress on Durability of Concrete

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Ferreira M, Castro-Gomes J, Costa P, Malheiro R. Influence of metakaoline on the chloride penetration performance of concrete. In ICDC 2012, International Congress on Durability of Concrete. Trondheim, Norway. 2012