Effect of superplasticizer type and dosage on fluidity and strength behavior of cemented tailings backfill with different solid contents

Yang, L, Yilmaz, E, Li, J, Liu, H and Jiang, H 2018, 'Effect of superplasticizer type and dosage on fluidity and strength behavior of cemented tailings backfill with different solid contents', Construction and Building Materials, vol. 187, pp. 290-298.


Document type: Journal Article
Collection: Journal Articles

Title Effect of superplasticizer type and dosage on fluidity and strength behavior of cemented tailings backfill with different solid contents
Author(s) Yang, L
Yilmaz, E
Li, J
Liu, H
Jiang, H
Year 2018
Journal name Construction and Building Materials
Volume number 187
Start page 290
End page 298
Total pages 9
Publisher Elsevier
Abstract This paper presents the coupled effect of solid content and superplasticizer type and dosage on the fluidity and strength properties of cemented tailings backfills (CTB). A total of three different superplasticizers (namely, naphthalene, ether-based and ester-based polycarboxylate) were used at a ratio varying from 0% to 0.5% by mass of CTB. The CTB mixes were proportioned with a solid content of 65%, 66%, 68% and 70%. The unconfined compressive strength tests were performed on cm samples after 3, 7 and 28 days of curing period. The obtained results show that the effect of superplasticizer on CTB performance depends on type and dosage of the superplasticizer used as well as solid content. The naphthalene-based polycarboxylate admixtures demonstrate the best improvement on fluidity behavior of fresh CTB mixture. For a given superplasticizer type, increases in the dosage of superplasticizer and decreases in the solid content lead to better workability of CTB samples. When increasing solid content, fresh CTB with high superplasticizer dosage performs a relatively low rate of decrease in the workability. A relatively high solid content and superplasticizer dosage have greatly contributed to improved mechanical strengths, especially at 28-day curing age, mainly due to a major reduction in water-to-cement ratio and porosity.
Subject Construction Materials
Mining Engineering
Keyword(s) Cemented tailings backfill
Compressive strength
Gold tailings
Superplasticizer
Workability
DOI - identifier 10.1016/j.conbuildmat.2018.07.155
Copyright notice © 2018 Published by Elsevier Ltd.
ISSN 0950-0618
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