TY - GEN
T1 - STUDY FOR RE-ASR BEHAVIOUR OF RECYCLED CONCRETE USING ASR GENERATED CONCRETE AND CONSIDERING COUNTERMEASURE TECHNOLOGY
AU - Iyoda, Takeshi
AU - Matsud, Nobuhiro
N1 - Publisher Copyright:
© 2022 The Author(s).
PY - 2022/3/3
Y1 - 2022/3/3
N2 - It is predicted that the concrete volume to be discarded will increase due to the renewal of the concrete structures and the increase in the returned concrete from construction site. The use of this concrete block as recycled aggregate is very important in terms of sustainability. However, recycled aggregate concrete is difficult to use due to large problems such as drying shrinkage and freeze-thaw action. On the other hand, the aggregate used for the raw concrete is often unknown, suggesting the danger of ASR. There is no previous research about what kind of danger is caused when an aggregate having an ASR risk is used as a recycled aggregate. Therefore, in this study, recycled aggregate was made from raw concrete where ASR occurred, after that recycled concrete was manufactured using this aggregate. After this, ASR tests were conducted again for the recycled concrete. In addition, we examined whether recycled concrete using aggregates with properties improved by using the previously reported carbonation technique could be an ASR countermeasure technology. As a result, it was found that the recycled concrete using the ASR-generated raw concrete as aggregate can suppress ASR by using recurring ASR aggregate treated by carbonation technology.
AB - It is predicted that the concrete volume to be discarded will increase due to the renewal of the concrete structures and the increase in the returned concrete from construction site. The use of this concrete block as recycled aggregate is very important in terms of sustainability. However, recycled aggregate concrete is difficult to use due to large problems such as drying shrinkage and freeze-thaw action. On the other hand, the aggregate used for the raw concrete is often unknown, suggesting the danger of ASR. There is no previous research about what kind of danger is caused when an aggregate having an ASR risk is used as a recycled aggregate. Therefore, in this study, recycled aggregate was made from raw concrete where ASR occurred, after that recycled concrete was manufactured using this aggregate. After this, ASR tests were conducted again for the recycled concrete. In addition, we examined whether recycled concrete using aggregates with properties improved by using the previously reported carbonation technique could be an ASR countermeasure technology. As a result, it was found that the recycled concrete using the ASR-generated raw concrete as aggregate can suppress ASR by using recurring ASR aggregate treated by carbonation technology.
KW - Carbonation technology
KW - re-ASR behavior
KW - recycled concrete
UR - http://www.scopus.com/inward/record.url?scp=85130225013&partnerID=8YFLogxK
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U2 - 10.14311/APP.2022.33.0271
DO - 10.14311/APP.2022.33.0271
M3 - Conference contribution
AN - SCOPUS:85130225013
T3 - Acta Polytechnica CTU Proceedings
SP - 271
EP - 276
BT - fib International Conference on Concrete Sustainability 2021
A2 - Sojkova, Katerina
A2 - Hajek, Petr
A2 - Fiala, Ctislav
PB - Czech Technical University in Prague
T2 - fib International Conference on Concrete Sustainability 2021, ICCS 2021
Y2 - 8 September 2021 through 10 September 2021
ER -