著者

鎌田 敏郎 西田 孝弘 今本 啓一 宮里 心一 長田 光司 河合 慶有 網野 貴彦 大即 信明

出版者

公益社団法人 日本コンクリート工学会

雑誌

コンクリート工学 (ISSN:03871061)

巻号頁・発行日

vol.60, no.11, pp.987-992, 2022 (Released:2023-11-01)

参考文献数

2

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(公社)日本コンクリート工学会では,「コンクリートのひび割れ調査,補修・補強指針-2013-」を,同指針2009の小改訂として刊行している。2009年の大改訂から13年が経過し,この間の新たな知見を加え,この度,「コンクリートのひび割れ調査,補修・補強指針 2022」を刊行した。この指針は,ひび割れに関心のあるすべての方が,ひび割れ発見から,調査,原因推定,評価,判定,補修・補強を体系化して行える指針である。本稿では同指針の内容を解説する。

著者

木下 尚樹 氏家 勲 河合 慶有 川口 隆 安原 英明 長江 俊勝

出版者

一般社団法人 資源・素材学会

雑誌

Journal of MMIJ (ISSN:18816118)

巻号頁・発行日

vol.133, no.6, pp.132-139, 2017-06-01 (Released:2017-06-23)

参考文献数

13

被引用文献数

12

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Industrial waste generated in the domestic paper industry in Japan was 5.1 million tons in 2015, and after reduction and recycling, 152 thousand tons of the waste was consequently disposed. Organic sludge (paper sludge), which occupies two-thirds of the industrial waste generated in the paper industry, is incinerated for the purpose of volume reduction and thermal recycling, and then it becomes paper sludge ash (PS ash). PS ash is recycled as aggregate, roadbed material in the civil engineering field and cement raw material, but it is necessary to further expand the application and reduce the final disposal amount. From the above background, in this research, the strength characteristics, the durability performance and the environmental impact of low carbon concrete produced by reducing cement usage to 45% by using PS ash as admixture in addition to fly ash and blast furnace slag fine powder, were investigated. Experimental results show that the low carbon concrete produced in this research has long term strength development, and that PS ash does not contribute to long term strength. Moreover, the clay mineral contained in the PS ash has an effect of reducing drying shrinkage by water retention and expansion. With respect to durability performance, neutralization is promoted by decreasing the total cement amount, while salt tolerance resistance is improved. Frost damage resistance tends to decrease. The elution amount of toxic substances is less than the soil environmental standard value.