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Article
Affiliation(s)

1. Design and Engineering for the Global Environment, Graduate School of Utsunomiya University, Tochigi 321-0904, Japan
2. Taiheiyo Cement Corporation Central Research Laboratory 2-4-2, Osaku, Sakura City, Chiba Prefecture 285-8655, Japan

ABSTRACT

In recent years, there has been a strong demand for sustainable concrete structures. In addition, the cement production has been a downward trend in Japan. However, the amount of wastes and by-products used for cement production has been increased. Therefore, it’s necessary to explore new utilization of a cement clinker besides the cement. The Gehlenite clinker is produced from large amounts of recycled industrial waste, such as construction waste soil, sewage sludge, waste clay and coal ash. This study investigated the effect of using Gehlenite clinker as fine aggregate on various properties of mortar and concrete. The results show that, compared to mortar containing a conventional fine aggregate, mortar containing clinker aggregate has higher compressive strength, less drying shrinkage, and lower carbonation rate. In addition, mortar was evaluated by self-healing performance. Moreover, the properties of concrete are almost the same as mortar in compressive strength and drying shrinkage. In this paper, in order to investigate the mechanism of carbonation of mortar Gehlenite clinker was used as fine aggregate. The results show that, when the fine aggregate is replaced with Gehlenite clinker, the representative porosity in the transition zone is reduced by approximately half and this improves resistance to carbonation.

KEYWORDS

Gehlenite, clinker, drying shrinkage, self-healing, carbonation.

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