Synthesis of Geopolymers from Mechanically Activated Coal Fly Ash and Improvement of Their Mechanical Properties

被引:10
作者
Matsuoka, Mitsuaki [1 ]
Yokoyama, Kaho [1 ]
Okura, Kohei [1 ]
Murayama, Norihiro [1 ]
Ueda, Masato [2 ]
Naito, Makio [3 ]
机构
[1] Kansai Univ, Fac Environm & Urban Engn, Dept Chem Energy & Environm Engn, 3-3-35 Yamate Cho, Suita, Osaka 5648680, Japan
[2] Kansai Univ, Fac Chem Mat & Bioengn, Dept Chem & Mat Engn, 3-3-35 Yamate Cho, Suita, Osaka 5648680, Japan
[3] Osaka Univ, Joining & Welding Res Inst, 11-1 Mihogaoka, Ibaraki, Osaka 5670047, Japan
关键词
coal fly ash; mechanical activation; geopolymerization; compressive strength; MECHANOCHEMISTRY; CONCRETE;
D O I
10.3390/min9120791
中图分类号
P3 [地球物理学]; P59 [地球化学];
学科分类号
0708 ; 070902 ;
摘要
Coal fly ash is a spherical fine powder by-product discharged from coal-fired power plants. When coal fly ash is used as raw materials for the synthesis of geopolymers, there are practical problems associated with the stable surface of the particles that do not allow the production of geopolymers with sufficient strength. A long-time is also required for the curing. In this study, we aim to promote the curing reaction of geopolymers by activating the surface of coal fly ash particles. By mechanically activating the surface of coal fly ash particles using an attrition-type mill, the dissolution of Si4+ and Al3+ in coal fly ash is promoted, and the acceleration of the reaction taking place during curing is also anticipated. The surface morphology and crystal phase of coal fly ash particles change with the use of an attrition-type mill. The mechanical activation results in improvement of the compressive strength and the acid resistance under milder curing conditions by the densification of the hardened body. Thus, it is clearly shown that mechanical activation is effective for the production of geopolymers with beneficial mechanical properties under milder curing conditions.
引用
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页数:10
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