The influence of basalt dust on the composition of the interfacial transition zone of aggregates with cement matrix
1
Uniwersytet Technologiczno-Przyrodniczy im. Jana i Jędrzeja Śniadeckich w Bydgoszczy
Publication date: 2019-04-06
Cement Wapno Beton 24(2) 92-103 (2019)
ABSTRACT
Addition of the basalt dust to the concrete results in very beneficial changes in its microstructure. Tiny dust particles are deposited in pores of the interfacial transition zone, reducing its porosity and causing the increase of C-S-H phase content. Between some minerals on the surface of basalt dust particles and the solution in cement paste pores with a high concentration of calcium ions, reactions are occurring that change the interfacial transition zone. Sodium and magnesium ions contained in the feldspars of basalt dust diffuse to the C-S-H phase layers, substituting calcium ions in its structure, which in turn are absorbed in the feldspar surface layers. The reactions of minerals in basalt dust with C-S-H phase result in the formation of very strong bonds of basalt dust particles with C-S-H phase in cement matrix, which has a very positive effect on the concrete strength
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