Performance evaluation on chlorine ion immobilizing ability of concrete using calcium aluminate aggregate and additive

Y. Nakanishi, S. Ito, Takeshi Iyoda

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Abstract

Japan is facing the sea on every side. It has been reported that there are many deteriorated concrete structures due to salt damage. In recent years, in order to improve the resistance to salt-damage, materials have been research and developed using calcium aluminate. In this research, we focus on the aggregate (CaO ·Al 2 O 3 aggregate) and admixture (CaO · 2Al 2 O 3 ) for making the specimens for improving resistance of salt damages. Compressive strength test, permeability of chloride ion and observation of aggregate interface on SEM were carried out, using concrete on different replacement of calcium aluminate materials. In order to confirm the composition of the product, a cement paste specimen using the calcium aluminate material was prepared and the hydration product was clarified using XRD.As a result of XRD test, it was found that the calcium aluminate materials react with water and calcium hydrate (Ca(OH) 2 ) which is a cement hydration product. And the calcium aluminate materials (especially CA aggregate) added with salt, it was found that chloride ion was immobilized as Friedel’s salt and hydration product was generated on the aggregate interface.We can see many hexagonal plate at the aggregate interface on observation of the aggregate interface by SEM. It was confirmed that the products are Friedel’s salt and hydration products form calcium aluminate materials from previous studies. Although according to water permeability test, the interface of aggregate may be densified by these hydration products. It is suggested that the densification of the aggregate interface may decrease the permeability inside the concrete. Furthermore, the effect of shielding salt is expected under the severe salt environment on long term.

Original languageEnglish
Title of host publicationLife-Cycle Analysis and Assessment in Civil Engineering
Subtitle of host publicationTowards an Integrated Vision - Proceedings of the 6th International Symposium on Life-Cycle Civil Engineering, IALCCE 2018
EditorsDan M. Frangopol, Robby Caspeele, Luc Taerwe
PublisherCRC Press/Balkema
Pages605-612
Number of pages8
ISBN (Print)9781138626331
Publication statusPublished - 2019 Jan 1
Event6th International Symposium on Life-Cycle Civil Engineering, IALCCE 2018 - Ghent, Belgium
Duration: 2018 Oct 282018 Oct 31

Publication series

NameLife-Cycle Analysis and Assessment in Civil Engineering: Towards an Integrated Vision - Proceedings of the 6th International Symposium on Life-Cycle Civil Engineering, IALCCE 2018

Conference

Conference6th International Symposium on Life-Cycle Civil Engineering, IALCCE 2018
CountryBelgium
CityGhent
Period18/10/2818/10/31

Fingerprint

Chlorine
Calcium
Concretes
Salts
Ions
Hydration
Cements
Scanning electron microscopy
Hydrates
Densification
Concrete construction
Shielding
Compressive strength
Water
Chemical analysis

ASJC Scopus subject areas

  • Civil and Structural Engineering
  • Safety, Risk, Reliability and Quality

Cite this

Nakanishi, Y., Ito, S., & Iyoda, T. (2019). Performance evaluation on chlorine ion immobilizing ability of concrete using calcium aluminate aggregate and additive. In D. M. Frangopol, R. Caspeele, & L. Taerwe (Eds.), Life-Cycle Analysis and Assessment in Civil Engineering: Towards an Integrated Vision - Proceedings of the 6th International Symposium on Life-Cycle Civil Engineering, IALCCE 2018 (pp. 605-612). (Life-Cycle Analysis and Assessment in Civil Engineering: Towards an Integrated Vision - Proceedings of the 6th International Symposium on Life-Cycle Civil Engineering, IALCCE 2018). CRC Press/Balkema.

Performance evaluation on chlorine ion immobilizing ability of concrete using calcium aluminate aggregate and additive. / Nakanishi, Y.; Ito, S.; Iyoda, Takeshi.

Life-Cycle Analysis and Assessment in Civil Engineering: Towards an Integrated Vision - Proceedings of the 6th International Symposium on Life-Cycle Civil Engineering, IALCCE 2018. ed. / Dan M. Frangopol; Robby Caspeele; Luc Taerwe. CRC Press/Balkema, 2019. p. 605-612 (Life-Cycle Analysis and Assessment in Civil Engineering: Towards an Integrated Vision - Proceedings of the 6th International Symposium on Life-Cycle Civil Engineering, IALCCE 2018).

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Nakanishi, Y, Ito, S & Iyoda, T 2019, Performance evaluation on chlorine ion immobilizing ability of concrete using calcium aluminate aggregate and additive. in DM Frangopol, R Caspeele & L Taerwe (eds), Life-Cycle Analysis and Assessment in Civil Engineering: Towards an Integrated Vision - Proceedings of the 6th International Symposium on Life-Cycle Civil Engineering, IALCCE 2018. Life-Cycle Analysis and Assessment in Civil Engineering: Towards an Integrated Vision - Proceedings of the 6th International Symposium on Life-Cycle Civil Engineering, IALCCE 2018, CRC Press/Balkema, pp. 605-612, 6th International Symposium on Life-Cycle Civil Engineering, IALCCE 2018, Ghent, Belgium, 18/10/28.
Nakanishi Y, Ito S, Iyoda T. Performance evaluation on chlorine ion immobilizing ability of concrete using calcium aluminate aggregate and additive. In Frangopol DM, Caspeele R, Taerwe L, editors, Life-Cycle Analysis and Assessment in Civil Engineering: Towards an Integrated Vision - Proceedings of the 6th International Symposium on Life-Cycle Civil Engineering, IALCCE 2018. CRC Press/Balkema. 2019. p. 605-612. (Life-Cycle Analysis and Assessment in Civil Engineering: Towards an Integrated Vision - Proceedings of the 6th International Symposium on Life-Cycle Civil Engineering, IALCCE 2018).
Nakanishi, Y. ; Ito, S. ; Iyoda, Takeshi. / Performance evaluation on chlorine ion immobilizing ability of concrete using calcium aluminate aggregate and additive. Life-Cycle Analysis and Assessment in Civil Engineering: Towards an Integrated Vision - Proceedings of the 6th International Symposium on Life-Cycle Civil Engineering, IALCCE 2018. editor / Dan M. Frangopol ; Robby Caspeele ; Luc Taerwe. CRC Press/Balkema, 2019. pp. 605-612 (Life-Cycle Analysis and Assessment in Civil Engineering: Towards an Integrated Vision - Proceedings of the 6th International Symposium on Life-Cycle Civil Engineering, IALCCE 2018).
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