Influence of the Partial Substitution of Industrial Clinker by Volcanic Lava Powder from Nyiragongo Volcano on the Physical Properties of Mortars  

作　　者：Seke Vangu Max Clement Nzau Umba Di Mbudi Makanzu Imwangana Fils Seke Makunga Daudet Efoto Eale Louis Seke Vangu Max;Clement Nzau Umba Di Mbudi;Makanzu Imwangana Fils;Seke Makunga Daudet;Efoto Eale Louis(Department of Physics and Technology, Faculty of Science and Technology, University of Kinshasa, Kinshasa, The Democratic Republic of the Congo;Faculties of Engineering & Architecture, Kongo University, Mbanza-Ngungu, The Democratic Republic of the Congo;Department of Geosciences, Faculty of Sciences and Technologies, University of Kinshasa, Kinshasa, The Democratic Republic of the Congo;Centre of Research on Geology and Mining, Laboratory of Geomorphology and Remote Sensing, Kinshasa, The Democratic Republic of the Congo;National Institute of Building and Public Works, INBTP, Kinshasa, The Democratic Republic of the Congo;Sibanye-StillWater Ltd., Johannesburg, South Africa)

机构地区：[1]Department of Physics and Technology, Faculty of Science and Technology, University of Kinshasa, Kinshasa, The Democratic Republic of the Congo [2]Faculties of Engineering & Architecture, Kongo University, Mbanza-Ngungu, The Democratic Republic of the Congo [3]Department of Geosciences, Faculty of Sciences and Technologies, University of Kinshasa, Kinshasa, The Democratic Republic of the Congo [4]Centre of Research on Geology and Mining, Laboratory of Geomorphology and Remote Sensing, Kinshasa, The Democratic Republic of the Congo [5]National Institute of Building and Public Works, INBTP, Kinshasa, The Democratic Republic of the Congo [6]Sibanye-StillWater Ltd., Johannesburg, South Africa

出　　处：《Journal of Minerals and Materials Characterization and Engineering》2023年第5期172-196,共25页矿物质和材料特性和工程（英文）

摘　　要：This study evaluates the pozzolanicity of Nyiragongo volcano lava flows in Congo by an indirect method using mortars with different rock powder proportions. The clinker used is a locally produced alite clinker, whose chemical and mineralogical composition was determined by XRF, Bogue and Taylor formulas. The lava flows were collected from the 2002, 2010 and 2021 eruption sites, and were characterized by XRF, CIPW normative mineralogy and geomechanical tests. The results show that Nyiragongo rocks are ultrabasic, silica- and alkali-rich, and contain minerals like nepheline, wollastonite and leucite. They satisfy the natural pozzolan criterion, and have pozzolanic activity indices above 70%. These rocks also have high RC and LA resistances, ranging from 190 MPa to 45 MPa, and from 18% to 32.6%, respectively. The rock powder addition in the mortars reduces mechanical resistances and increases setting times, except for a 5% replacement rate, which speeds up hardening. Nyiragongo lava can be used as a pozzolanic addition to produce a CEM II/B-P 32.5 cement.This study evaluates the pozzolanicity of Nyiragongo volcano lava flows in Congo by an indirect method using mortars with different rock powder proportions. The clinker used is a locally produced alite clinker, whose chemical and mineralogical composition was determined by XRF, Bogue and Taylor formulas. The lava flows were collected from the 2002, 2010 and 2021 eruption sites, and were characterized by XRF, CIPW normative mineralogy and geomechanical tests. The results show that Nyiragongo rocks are ultrabasic, silica- and alkali-rich, and contain minerals like nepheline, wollastonite and leucite. They satisfy the natural pozzolan criterion, and have pozzolanic activity indices above 70%. These rocks also have high RC and LA resistances, ranging from 190 MPa to 45 MPa, and from 18% to 32.6%, respectively. The rock powder addition in the mortars reduces mechanical resistances and increases setting times, except for a 5% replacement rate, which speeds up hardening. Nyiragongo lava can be used as a pozzolanic addition to produce a CEM II/B-P 32.5 cement.

关 键 词：POZZOLAN Cement ALITE Nyiragongo ASR (Alkali-Silica Reaction) 

分 类 号：TB3[一般工业技术—材料科学与工程]