Effect of sodium-silicate activated slag at different silicate modulus on the strength and microstructural properties of full and coarse sulphidic tailings paste backfill

Cihangir, Ferdi; Erçıkdı, Bayram; Kesimal, Ayhan; Ocak, Sinan; Akyol, Yunus

doi:10.1016/j.conbuildmat.2018.07.105

Cited by 108 publications

(40 citation statements)

References 53 publications

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“…Numerous researchers have conducted extensive research on the activation of slag powder and new filling materials. Cihangir et al [22] reported that the cement-related costs were significantly reduced (35%) to achieve an equal strength of 1 MPa for 28-day cured CPB samples, increasing the corresponding mechanical strength gain. Kermani et al [23,24] also reported that the addition of a proper amount of an alkali activator such as sodium silicate could improve the backfill's strength, drainage, and microstructural properties.…”

Section: Introductionmentioning

confidence: 99%

Compressive Strength Characteristics of Cemented Tailings Backfill with Alkali-Activated Slag

et al. 2018

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With the use of glauberite mineral (GM) and sodium hydroxide (SH) alkaline catalysts to stimulate slag powder’s internal cementation activity and incorporate the two fine-grained solid wastes, such as quicklime (Q) and desulfurized ash (DA), a new cementitious material suitable for mine tailings was developed to replace traditional ordinary Portland cement (OPC) for reducing cement-related costs. A series of uniaxial compressive strength (UCS) tests were carried out on cemented tailings backfill (CTB) samples containing different activators. The results showed that (1) the highest UCS values of 14-day and 28-day cured CTB samples were 1.259 MPa and 2.429 MPa, respectively, and the effect of different activator types was in the order of SH > GM > DA > Q and SH > GM > Q > DA; (2) the relationship between UCS and activator dosages followed the function y = ax3 − bx2 + cx − d. Compared with the OPC 32.5 R cemented samples, the minimum strength growth factor was 1.45, and the maximum reached 2.03; (3) the optimal proportion of DA slag formula was 4.5% or 5.0% Q, 19% DA, 2.5% GM, and 0.7% SH. The aforesaid new cementitious materials met the mine’s UCS requirements with a relatively low cost (17.04–17.20 €/ton) and solved the stacking problem of solid wastes on the surface well. Ultimately, this study provides a useful reference for the development of mineral binders.

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Section: Introductionmentioning

confidence: 99%

Compressive Strength Characteristics of Cemented Tailings Backfill with Alkali-Activated Slag

et al. 2018

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“…Previous studies [18,42,43] argue that increasing the fineness of slag within a certain range improves the compressive strength of the AAS-based materials. In tests, the effect of the fineness of slag on the evolution of the rheological properties was evaluated ( Figure 6).…”

Section: Effect Of the Fineness Of Slagmentioning

confidence: 99%

“…These observations can be explained by the fact that the increase in the fineness of the slag favors the reactivity of slag, thus leading to the formation of higher amount of hydration products and the consumption of more free water. Previous studies [18,42,43] argue that increasing the fineness of slag within a certain range improves the compressive strength of the AAS-based materials. In tests, the effect of the fineness of slag on the evolution of the rheological properties was evaluated ( Figure 6).…”

Section: Effect Of the Fineness Of Slagmentioning

confidence: 99%

“…To reduce the binder-induced costs, to increase the backfill strength/stability performance, and to develop the resistance to acid and sulphate attacks, numerous efforts in utilizing pozzolanic materials such as pulverized fly ash, silica fume and ground granulated blast furnace slag (slag) for the partially replacement of OPC have been made by researchers [13][14][15][16]. However, these studies have indicated that the use of natural and artificial pozzolans as a partial replacement of OPC yields lower early mechanical strength and lower rate of gain in the early mechanical strength [17,18].…”

Section: Introductionmentioning

confidence: 99%

“…Alkali-activated binders could be designed to have superior properties compared to cement, namely the development of earlier and higher mechanical strengths [22], better resistance to acids and sulphates [23], and lower heat of cement hydration [24]. Numerous studies [17,18,[25][26][27] have been recently shown to better assess the mechanical, workability and microstructural properties of CPB materials by using alkali-activated slag (AAS) as a binder. These studies have shown that, compared to those made up of OPC, CPB samples containing AAS as binder were found to produce remarkably higher early-age strength and stability.…”

Section: Introductionmentioning

confidence: 99%

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Rheological Properties of Cemented Paste Backfill with Alkali-Activated Slag

et al. 2020

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This study investigates the time-dependent rheological behavior of cemented paste backfill (CPB) that contains alkali-activated slag (AAS) as a binder. Rheological measurements with the controlled shear strain method have been conducted on various AAS-CPB samples with different binder contents, silicate modulus (Ms: SiO2/Na2O molar ratio), fineness of slag and curing temperatures. The Bingham model afforded a good fit to all of the CPB mixtures. The results show that AAS-CPB samples with high binder content demonstrate a more rapid rate of gain in yield stress and plastic viscosity. AAS-CPB also shows better rheological behavior than CPB samples made up of ordinary Portland cement (OPC) at identical binder contents. It is found that increasing Ms yields lower yield stress and plastic viscosity and the rate of gain in these parameters. Increases in the fineness of slag has an adverse effect on rheological behavior of AAS-CPB. The rheological behavior of both OPC- and AAS-CPB samples is also strongly enhanced at higher temperatures. AAS-CPB samples are found to be more sensitive to the variation in curing temperatures than OPC-CPB samples with respect to the rate of gain in yield stress and plastic viscosity. As a result, the findings of this study will contribute to well understand the flow and transport features of fresh CPB mixtures under various conditions and their changes with time.

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Study on Tailings Covering System Constructed by Geological Polymerization of Mine Waste, Part 1: Material Characterization and Cover Construction

Chen

Tian

et al. 2021

Bull Environ Contam Toxicol

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Effect of sodium-silicate activated slag at different silicate modulus on the strength and microstructural properties of full and coarse sulphidic tailings paste backfill

Cited by 108 publications

References 53 publications

Compressive Strength Characteristics of Cemented Tailings Backfill with Alkali-Activated Slag

Compressive Strength Characteristics of Cemented Tailings Backfill with Alkali-Activated Slag

Rheological Properties of Cemented Paste Backfill with Alkali-Activated Slag

Study on Tailings Covering System Constructed by Geological Polymerization of Mine Waste, Part 1: Material Characterization and Cover Construction

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