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

Y. Nakanishi, S. Ito, Takeshi Iyoda

研究成果: Conference contribution

抜粋

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.

元の言語English
ホスト出版物のタイトルLife-Cycle Analysis and Assessment in Civil Engineering
ホスト出版物のサブタイトルTowards an Integrated Vision - Proceedings of the 6th International Symposium on Life-Cycle Civil Engineering, IALCCE 2018
編集者Dan M. Frangopol, Robby Caspeele, Luc Taerwe
出版者CRC Press/Balkema
ページ605-612
ページ数8
ISBN(印刷物)9781138626331
出版物ステータスPublished - 2019 1 1
イベント6th International Symposium on Life-Cycle Civil Engineering, IALCCE 2018 - Ghent, Belgium
継続期間: 2018 10 282018 10 31

出版物シリーズ

名前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

Conference

Conference6th International Symposium on Life-Cycle Civil Engineering, IALCCE 2018
Belgium
Ghent
期間18/10/2818/10/31

ASJC Scopus subject areas

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

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  • これを引用

    Nakanishi, Y., Ito, S., & Iyoda, T. (2019). Performance evaluation on chlorine ion immobilizing ability of concrete using calcium aluminate aggregate and additive. : D. M. Frangopol, R. Caspeele, & L. Taerwe (版), 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.