Enhancement of the pozzolanic activity of natural clays by mechanochemical activation

被引：35

作者：

Tole, Ilda ^{[1
]}

Delogu, Francesco ^{[2
]}

Qoku, Elsa ^{[3
]}

Habermehl-Cwirzen, Karin ^{[1
]}

Cwirzen, Andrzej ^{[1
]}

机构：

[1] Lulea Univ Technol, Dept Civil Environm & Nat Resources Engn, Bldg Mat, S-97187 Lulea, Sweden

[2] Univ Cagliari, Dipartimento Ingn Meccan Chim & Mat, Via Marengo 2, I-09123 Cagliari, Italy

[3] Georgia Tech, Sch Civil & Environm Engn, 790 Atlantic Dr, Atlanta, GA 30332, Georgia

来源：

CONSTRUCTION AND BUILDING MATERIALS | 2022年 / 352卷

关键词：

Grinding; Blended Cement; Pozzolan; SCMs; Clays; SUPPLEMENTARY CEMENTITIOUS MATERIALS; S-H COMPOSITION; MECHANICAL ACTIVATION; HYDRATION PROPERTIES; CALCINED CLAYS; REACTIVITY; METAKAOLIN; KINETICS;

D O I：

10.1016/j.conbuildmat.2022.128739

中图分类号：

TU [建筑科学];

学科分类号：

0813 ;

摘要：

Replacement of cement with supplementary cementitious materials (SCMs) is a proven method to reduce clinker in cement and contribute to decreased CO2 emissions. Natural clays are commonly occurring materials that do not possess pozzolanic activity in their original state. Mechanochemical activation (MCA) can be an alternative and sustainable method to enhance their reactivity. In this study, the pozzolanic reactivity of three natural clays, originating from Sweden, was analyzed after the application of MCA in a planetary ball mill. Strength activity index (SAI), Frattini test, and conductivity test were used to evaluate the pozzolanic reactivity. All processed clays by MCA have achieved a SAI greater than 100%, while the Frattini test indicated an improved pozzolanic activity of samples containing a higher amount of clay minerals. The obtained results show that MCA could improve the pozzolanic reactivity, but the effect depends on the mineralogical composition and particle size of the clays.

引用

页数：11

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