An experimental investigation on self-compacting alkali activated slag concrete mixes

Manjunath, R.; Narasimhan, M. S.

doi:10.1016/j.jobe.2018.01.009

Cited by 57 publications

(19 citation statements)

References 17 publications

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“…Addition of sodium silicate to the CTB mix can reduce the total porosity and the required setting time of the backfill, contributing to an increase in the backfill strength and ore production. In addition, Manjunath et al [25] developed concrete mixtures with granulated blast furnace slag as an aggregate, and their results demonstrate that alkaline solution can activate slag effectively. Gebregziabiher et al [26] believed that the hydration process and mechanical properties of slag cement are highly dependent on type and dosage of alkaline catalysts.…”

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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“…The application of activated SSS forms a gel that fills the pores and causes a denser microstructure that reduces the porosity of the concrete. Previous studies [ 66 ] concluded that the use of an alkaline solution providing more OH − ions led to a reduction in permeability directly associated with improved mechanical properties. For this reason, it was observed that the microstructure formed in the alkali-activated SCC led to even better performance against tensile strength.…”

Section: Test Methods and Resultsmentioning

confidence: 99%

Alkali-Activated Stainless Steel Slag as a Cementitious Material in the Manufacture of Self-Compacting Concrete

et al. 2021

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This work develops the manufacture of self-compacting concrete (SCC) with 50% cement reduction. As an alternative binder to cement, the viability of using an alkali-activated combination of stainless steel slag (SSS) and fly ash (FA) has been demonstrated. SSS was processed applying three different treatments. Binders were manufactured mixing 35% SSS with 65% FA, as precursors, and a hydroxide activating solution. This binder was replaced by the 50% cement for the manufacture of SCC. The results obtained show good mechanical properties and durability. The study shows a reduction in the use of cement in the manufacture of SCC reusing two wastes.

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“…Manjunath and Narasimhan [26] studied tensile strength and compressive strength of self-consolidating concrete (SCC) with AAS as only binder and GGBS as fine and coarse aggregates. The alkaline activator solutions consisted of a combination of sodium hydroxide and water glass with Na 2 O values of 7%, 8%, and 9% by weight of slag.…”

Section: Mechanical Properties Of Alkali-activated Slag Concrete Amentioning

confidence: 99%

A Review of Durability and Strength Characteristics of Alkali-Activated Slag Concrete

Mohamed

2019

Materials

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Alkali-activated slag (AAS) is a promising alternative to ordinary Portland cement (OPC) as sole binder for reinforced concrete structures. OPC is reportedly responsible for over 5% of the global CO2 emission. In addition, slag is an industrial by-product that must be land-filled if not re-used. Therefore, it has been studied by many investigators as environmentally friendly replacement of OPC. In addition to recycling, AAS offers favorable properties to concrete such as rapid development of compressive strength and high resistance to sulfate attack. Some of the potential shortcomings of AAS include high shrinkage, short setting time, and high rate of carbonation. Using ground granulated blast furnace slag (GGBS) as an alternative to OPC requires its activation with high alkalinity compounds such as sodium hydroxide (NaOH), sodium sulfate (Na2SO3), sodium carbonate (Na2CO3), or combination of these compounds such as NaOH and Na2SO3. The mechanism of alkali-activation is still not fully understood and further research is required. This paper overviews the properties, advantages, and potential shortcomings of AAS concrete.

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An experimental investigation on self-compacting alkali activated slag concrete mixes

Cited by 57 publications

References 17 publications

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

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

Alkali-Activated Stainless Steel Slag as a Cementitious Material in the Manufacture of Self-Compacting Concrete

A Review of Durability and Strength Characteristics of Alkali-Activated Slag Concrete

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