STRENGTH AND LENGTH CHANGES OF MORTAR MIXED WITH RECYCLED GYPSUM POWDER

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  • GOTO Yu
    NAGOYA INSTITUTE OF TECHNOLOGY, Graduate School of Engineering in Department of Civil-Engineering（Gokiso, Showa-ku, Nagoya-shi, Aichi 466-8555, Japan）
  • UEHARA Takumi
    NAGOYA INSTITUTE OF TECHNOLOGY, Graduate School of Engineering in Department of Civil-Engineering（Gokiso, Showa-ku, Nagoya-shi, Aichi 466-8555, Japan）

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Other Title
  • 再生石膏粉を混和したモルタルの強度と長さ変化

Abstract

<p>The amount of waste gypsum board, which is one of the controlled industrial wastes, is increasing year by year, and there is an urgent need to take measures due to concerns about the tightness of the final disposal site. Waste gypsum board was treated as controlled industrial waste in 1999, and there is concern that there will be a shortage of controlled final disposal sites. In this study, waste gypsum board powder （hereinafter referred to as recycled gypsum powder）, which is obtained by crushing, separating, and heating waste gypsum board, is kneaded into cement mortar. The applicability as a material or an admixture was considered. Although the strength of mortar mixed with recycled gypsum powder decreases, the results show that it is possible to control the strength decrease to some extent by using fly ash and blast furnace slag fine powder together. Since gypsum has swelling properties, the length of mortar mixed with regenerated gypsum powder was changed between wet and dry states, and the effect of mixing was clarified from experiments. Based on these results, the use of recycled gypsum powder was considered. Although the activity of recycled gypsum powder cannot be expected, it is desired to develop applications as bulk materials and backfill materials by paying attention to the feature of reducing shrinkage performance.</p>

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