Performance Evaluation of Low Carbon Concrete using Paper Sludge Ash
| Autor: | Naoki KINOSHITA, Isao UJIKE, Keiyu KAWAAI, Takashi KAWAGUCHI, Hideaki YASUHARA, Toshikatsu NAGAE |
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| Jazyk: | English<br />Japanese |
| Rok vydání: | 2017 |
| Předmět: | |
| Zdroj: | Journal of MMIJ, Vol 133, Iss 6, Pp 132-139 (2017) |
| Druh dokumentu: | article |
| ISSN: | 1881-6118 1884-0450 |
| DOI: | 10.2473/journalofmmij.133.132 |
| Popis: | 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. |
| Databáze: | Directory of Open Access Journals |
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