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Study on the Strength Development of Cemented Backfill Body from Lead-Zinc Mine Tailings with Sulphide
College of Civil Engineering, Zhengzhou University.
Beijing General Research Institute of Mining and Metallurgy.
College of Civil Engineering, Zhengzhou University.
Beijing General Research Institute of Mining and Metallurgy.
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2018 (English)In: Advances in Materials Science and Engineering, ISSN 1687-8434, E-ISSN 1687-8442, Vol. 2018, article id 7278014Article in journal (Refereed) Published
Abstract [en]

The unconfined compressive strength (UCS) development of cemented backfill materials for lead-zinc mine tailings with sulphide was studied. The results showed that the UCS of the cemented backfill body with ordinary Portland cement (OPC) as binder decreased in the later curing days, regardless of particle size. Under the same conditions, the higher the OPC content, the higher the UCS of the cemented backfill body, and the UCS of the cemented backfill body began to decrease at the longer curing days. Under the same conditions, the finer the tailings, the lower the UCS of the cemented backfill body at each age, and the UCS of the cemented backfill body began to decrease at the earlier curing age. X-ray diffraction analysis (XRD) showed that the reduction of the UCS of the cemented backfill body was related to the formation of an expansive substance (expansive gypsum) in the cemented backfill body, which led to the cracking of the test sample. In the cemented backfill materials of coarse tailings of lead-zinc mine, the composite binder formed by OPC and calcined kaolin (CK) containing metakaolin was used; the amount of calcium hydroxide, the hydration product of cement, was reduced or eliminated due to the pozzolanic reaction of metakaolin; and the amount of expansive gypsum was reduced or eliminated, so the UCS of the cemented backfill body increased within 360 days of curing.

Place, publisher, year, edition, pages
Hindawi Publishing Corporation, 2018. Vol. 2018, article id 7278014
National Category
Geotechnical Engineering
Research subject
Soil Mechanics
Identifiers
URN: urn:nbn:se:ltu:diva-68569DOI: 10.1155/2018/7278014ISI: 000431299000001OAI: oai:DiVA.org:ltu-68569DiVA, id: diva2:1202879
Note

Validerad;2018;Nivå 2;2018-05-02 (andbra)

Available from: 2018-05-02 Created: 2018-05-02 Last updated: 2018-05-17Bibliographically approved

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