報告書番号

N05040

タイトル（和文）

石炭ガス化スラグの高付加価値化有効利用技術の開発－コンクリート用軽量細骨材への適用性評価－

タイトル（英文）

Engineering development on high-valued added effective utilization of coal-gasification-slag- Evaluation of applicability to lightweight-fine-aggregate for concrete -

概要 （図表や脚注は「報告書全文」に掲載しております）

石炭ガス化複合発電プロセスで副産される石炭ガス化スラグの有効利用方策を確立することは，資源有効利用や環境保護対策として重要であるばかりでなく，その発電方式の普及にとっても肝要である。本研究は，石炭ガス化スラグの加熱発泡性に着目して，コンクリート用軽量細骨材を加工製造し，その適用性を評価したものである。その結果，(1)所要のスランプを満足する為のコンクリート配合，(2)圧縮･引張強度，静弾性係数，(3)中性化抵抗性，アルカリ骨材反応性，といった評価項目において，市販人工軽量細骨材を用いたコンクリートと同等以上の性能を確認し，石炭ガス化スラグ軽量細骨材としての有用性を見出した。また，一方でAE剤吸着による気泡組織の悪化や，それによる耐凍害性の低下といった課題を明らかにし，今後の有効利用技術開発の展開を示した。

概要 （英文）

Integrated coal gasification combined cycle (IGCC) system has been developed toward to the practical use now in Japan. It is essential not only for effective utilization of resource and environmental protection measures, but also for spread of IGCC system to develop utilization techniques of coal gasification slag (CGS) discharged from IGCC plant. Focusing attention on the heat-foaming ability of CGS, We have been developing the trimming weight technique of CGS with heat-foaming. In this paper, the applicability of CGS to lightweight fine aggregate for concrete was evaluated. The results of our experiment clearly show following terms.(1) It is possible to produce concrete containing lightweight fine aggregate of CGS with normal mix proportion parameters such as unit quantity of water and sand-total aggregate ratio.(2) Compressive and splitting tensile strength, and static elasticity modulus of CGS concrete is the same or more than of concrete containing commercially available artificial lightweight fine aggregate.(3) Carbonation resistance of CGS concrete is larger than those of concrete containing commercially available artificial lightweight fine aggregate.(4) CGS is harmless on alkali-aggregate reaction.It was found from these results that CGS can be used as lightweight fine aggregate for concrete. At the same time, several issues was clarified that, however, adsorption of air-entraining admixture by CGS causes degradation of air void structure and resistance to freezing and thawing action.

報告者

キーワード