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Open AccessArticle

Nephrite-Bearing Mining Waste As a Promising Mineral Additive in the Production of New Cement Types

1
Baikal Institute of Nature Management, Siberian Branch of the Russian Academy of Sciences (BINM SB RAS), 6, Sakhyanovoy str., Ulan-Ude 670047, Russia
2
Geological Institute, Siberian Branch of the Russian Academy of Sciences (GIN SB RAS), 6a, Sakhyanovoy str., Ulan-Ude 670047, Russia
*
Author to whom correspondence should be addressed.
Minerals 2020, 10(5), 394; https://doi.org/10.3390/min10050394
Received: 20 March 2020 / Revised: 24 April 2020 / Accepted: 26 April 2020 / Published: 28 April 2020
(This article belongs to the Special Issue Minerals and Other Phases in Constructional Geomaterials)
A growing demand for products made of jewelry and ornamental stones, including nephrite, requires an increase in mining volume. However, only less than 30% of the extracted raw material is suitable for processing. The rest of the low grade nephrites are substandard and unclaimed, and they negatively affect various life spheres. In this regard, their involvement in industrial turnover is an actual task. One of the directions of mining waste use is production of building materials, in particular, cements. The low grade nephrite can act here as mineral additives. In the course of the research, the optimal amount of low grade nephrite waste additive was determined, which is 30% of the cement mass. The grinding time of a raw mix is 10 min. It was found that introduction of the additive affects the hydration activity of cement compositions. Compressive strength of the mixed cement is 25% higher than that of the control sample. At the same time, new phases in the hydrated cement were not recorded. Good physical and mechanical properties of the obtained cements are achieved when hardening in normal humidity conditions. Heat and humidity treatments do not facilitate the hydration processes in binary systems. The conducted studies have shown that low grade nephrite can be used as mineral additives in cement production. This will allow development of not only a new type of product, but also reduction of the negative impact of cement production on the environment. View Full-Text
Keywords: nephrite deposits; low-grade nephrite; mineral additive; cement nephrite deposits; low-grade nephrite; mineral additive; cement
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MDPI and ACS Style

Khudyakova, L.I.; Kislov, E.V.; Paleev, P.L.; Kotova, I.Y. Nephrite-Bearing Mining Waste As a Promising Mineral Additive in the Production of New Cement Types. Minerals 2020, 10, 394.

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