Study of Si-stoff as a Mineral Additive to Cellular Concrete on Anthropogenic Raw Material of the Kola Mining Industrial Complex

Number of journal: №5-2018
Autors:

Pak A.A.

DOI: https://doi.org/10.31659/0585-430X-2018-759-5-11-15
УДК: 691.33

AbstractAbout AuthorsReferences
Si-stoff is a by-product of the complex nitic-acid treatment of apatite-nepheline ore. Due to the content of over 80 mass % of micro-silica as a main mineral in amorphous state, Si-stoff is of great interest as an active mineral additive for producing binders and cellular concretes. But the study conducted by authors according to GOST 25094–2015 “Additives active mineral for cement. Methods for determining the activity” shows that the compression strength indicators of Si-stoff don’t make it possible to recommend it as an active mineral additive to cements, but it is reaction-active concerning the lime absorption that makes it prospective in cellular-concrete lime containing mixes. The article presents the results of experimental studies of efficiency of the use of Si-stoff in cellular-concrete mixes on the basis of anthropogenic raw material of the Kola mining industrial complex. It is established that the introduction of 15–20 mass% of Si-stoff in cellular-concrete mixes of less than 500 kg/m3 density increases the strength of concrete by 1.5–2.2 times. Addition of Si-stoff to concrete mixes of higher densities leads to the reduction in the density of gas concrete by 12–20% and compression strength by 35–42%.
A.A. PAK, Candidate of Sciences (Engineering) (This email address is being protected from spambots. You need JavaScript enabled to view it.)

The I.V. Tananaev Institute of Chemistry and Technology of Rare Elements and Mineral Raw Materials of the Russian Academy of Sciences Kola Science Center (26a, «Academic Town», Apatity, 184209, Murmansk region, Russian Federation)

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For citation: Pak A.A. Study of si-stoff as a mineral additive to cellular concrete on anthropogenic raw material of the Kola mining industrial complex. Stroitel’nye Materialy [Construction Materials]. 2018. No. 5, pp. 11–15. DOI: https://doi.org/10.31659/0585-430X-2018-759-5-11-15 (In Russian).


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