Non-burnt earth block using unused earth resources of by-products and waste

2019 Fiscal Year Final Research Report

• Project/Area Number: 19K21097
• Project/Area Number (Other): 18H05931 (2018)
• Research Category: Grant-in-Aid for Research Activity Start-up
• Allocation Type: Multi-year Fund (2019); Single-year Grants (2018)
• Review Section: 0304:Architecture, building engineering, and related fields
• Research Institution: Nara Women's University
• Principal Investigator: Nakamura Wataru 奈良女子大学, 生活環境科学系, 助教 (50824538)
• Project Period (FY): 2018-08-24 – 2020-03-31
• Keywords: 土 / 成形体 / 非焼成 / 圧縮強度 / 寸法精度 / 廃土 / 汚泥 / 副産物

Outline of Final Research Achievements

For clayley and sandy by-products and wastes, the addition of magnesium oxide, which has less environmental impact, was found to reduce shrinkage and improve compressive strength.
Based on these results, it was confirmed that the previously published mix design method for the mix proportion was effective for by-products and waste. In other words, if the percentage of fine particles (especially fine particles of 75 μm or less) contained in the sample is known, it is possible to find the target mix proportion for use as a earth block with respect to the target formability (the relationship between the condition of the sample and the molding method), shrinkage, and compressive strength.

Free Research Field

建築材料

Academic Significance and Societal Importance of the Research Achievements

環境問題が深刻化する中、土は環境優位性が高く、これらの状況をかえる大きな可能性を有している。本研究では、成形体として建築の内外装や舗装材などの外構材への利用を想定しているが、このとき一般的な土だけでなく、副産物や廃棄物として捨てられている土や砂が生かせれば、より大きな環境負荷の低減が期待できる。
本研究の成果によって、土成形体の調合を求める際に、今まで要求性能ごとに調合を検討していた試行的な実験の手間を大幅に削減することが期待できる。その結果、試作、製品化への手間を省き、廃棄物の有効利用を促進することが可能である。