IMPROVEMENT MECHANISM OF RECYCLED CONCRETE USING C-S-H TYPE ACCELERATOR AND MODIFYING RECYCLED AGGREGATE BY CARBONATION TECHNOLOGY

Akari Shibuya, Nobuhiro Matsuda, Takeshi Iyoda

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

Abstract

In Japan, there is concern that concrete blocks due to demolition will increase with the renewal of concrete structures. Although it has been used for roadbed materials as recycling, in recent years, aggregates are removed from the concrete mass by crushing and grinding and used again as concrete aggregates. In concrete using recycled aggregates, it is necessary to take account of insufficient strength, drying shrinkage, freeze-thaw resistance. In previous study, the quality of recycled aggregates was improved by adsorbing carbon dioxide to recycled aggregates, and recycled concrete used the modified aggregates has been confirmed to increase strength and reduce drying shrinkage. In this study, we focused on the aggregate interface of concrete such as the interfacial transition zone for the purpose of clearing the quality improvement method of recycled concrete. We attempted to modify the aggregate interface using a C-S-H hardening accelerator using two recycled aggregates of different quality and concrete using ordinary aggregates. We will also compare which is more effective, concrete that tried to modify the aggregate interface and recycled concrete that uses carbonated modified recycled aggregate. We try include strength test, drying shrinkage test, and freeze-thaw test. We clarify the matters concerned about recycled concrete.

Original languageEnglish
Title of host publicationfib International Conference on Concrete Sustainability 2021
EditorsKaterina Sojkova, Petr Hajek, Ctislav Fiala
PublisherCzech Technical University in Prague
Pages533-538
Number of pages6
ISBN (Electronic)9788001069646
DOIs
Publication statusPublished - 2022 Mar 3
Eventfib International Conference on Concrete Sustainability 2021, ICCS 2021 - Prague, Czech Republic
Duration: 2021 Sep 82021 Sep 10

Publication series

NameActa Polytechnica CTU Proceedings
Volume33
ISSN (Electronic)2336-5382

Conference

Conferencefib International Conference on Concrete Sustainability 2021, ICCS 2021
Country/TerritoryCzech Republic
CityPrague
Period21/9/821/9/10

Keywords

  • C-S-H hardening accelerator
  • mass transfer resistance
  • recycled aggregate
  • recycled concrete

ASJC Scopus subject areas

  • Engineering(all)
  • Physics and Astronomy(all)
  • Applied Mathematics

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