Preparation, physico-mechanical characteristics and durability of eco-alkali-activated binder from blast-furnace slag, cement kiln-by-pass dust and microsilica ternary system

Heikal, Mohamed; Zaki, Magdi E. A.; Ibrahim, Sahar M.

doi:10.1016/j.conbuildmat.2020.119947

Cited by 19 publications

(9 citation statements)

References 69 publications

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“…The alkali-activation of GGBS products mixed with 3.5–5.5 wt.% sodium hydroxide or water glass yields a low-basic, highly amorphous C-S-H gel product possessing high aluminum content [ 61 ]. BPD is an excellent alkaline activator enhancing the dissolution of Si- and Al-containing GGBS [ 31 ]. It is assumed that the Si–O-Si, Al–O–Al and Al–O–Si bonds in the aluminosilicate, silicate, and/or aluminate solids are broken first and the dissolution into alumina silicate species and together with alkali cations polymerize and produce the geopolymer network.…”

Section: Resultsmentioning

confidence: 99%

“…The presence of free CaO and significant amounts of soluble sodium and potassium compounds (chlorides and sulfates) in BPD causes its high alkalinity [ 29 ]. Thanks to BPD’s alkaline nature, it can be used as an alkali activator of supplementary cementitious materials [ 30 , 31 , 32 ]. In recent years, many scientific advances in the preparation technology and the insights into the performances of new binders with a geopolymer matrix developed by blending BPDs with the fly ash and/or granulated blast furnace steel slag (GGBS) have performed [ 15 , 33 , 34 ].…”

Section: Introductionmentioning

confidence: 99%

“…In accordance with paper [ 37 ], the alkali activated cements are characterized by more durable geopolymer matrix and lower carbon footprint than ordinary Portland cement. Heikal et al [ 31 ] reported on more durable binder with optimized mix composition of GGBS, BPD, and/or micro-silica, where 20% BPD amount was used.…”

Section: Introductionmentioning

confidence: 99%

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Incorporation of Cement Bypass Dust in Hydraulic Road Binder

Števulová

Strigac²,

Junak

et al. 2020

Materials

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This article describes utilization of a cement kiln bypass dust utilization as an added component in a hydraulic road binder. Three experimental binder mixes (BM1–BM3) with variation in the composition of the main constituents (cement clinker, ground limestone and ground granulated blast furnace slag) and constant content of bypass dust (10%) were prepared under laboratory conditions. The properties of binder constituents, fresh experimental binder mixes and hardened specimens were tested according to STN EN 13282-2 for a normal hardening hydraulic road binder. The physical and chemical properties of all binder mixes (fineness: +90 µm ≤ 15 wt.%; SO3 content: <4 wt.%) met the standard requirements. The bypass dust addition led to an increase in the water content for standard consistency of cement mixes (w/c = 0.23) and to a shortening of the initial setting time for two experimental blended cement pastes (BM1 and BM3) compared with the value required by the standard. Only BM2 with the lowest SO3 content (0.363 wt.%) and the highest percentage of granulated blast furnace slag (9.5 wt.%) and alkalis (Na2O and K2O content of 5.9 wt.%) in the binder mix met the standard value for the initial setting time (≥150 min). The results of compressive strength testing of experimental specimens after 56 days of hardening (59.2–63.9 MPa) indicate higher values than the upper limit of the standard requirement for the N4 class (≥32.5; ≤52.5 MPa).

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Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Incorporation of Cement Bypass Dust in Hydraulic Road Binder

Števulová

Strigac²,

Junak

et al. 2020

Materials

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“…The samples were kept at 25 • C to 80 • C until their weight was constant to eliminate all bound water [73]. The main reaction products, (N,C)-A-S-H, C-S-H and C-A-S-H gels [74,75], formed during hydration / activation, along with the zeolites (hydroxysodalite and herschelite) detected with XRD [76,77], decomposed in the first range (80 • C to 350 • C). The data also denoted a very close correlation between compressive strength and weight loss detected in this temperature range: the greater the loss and therefore the greater the amount of reaction product forming, the higher the compressive strength (see Table 6).…”

Section: Hybrid Cement Paste Mineralogical and Microstructural Characterisationmentioning

confidence: 99%

Hybrid Cements: Mechanical Properties, Microstructure and Radiological Behavior

et al. 2022

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The use of more eco-efficient cements in concretes is one of the keys to ensuring construction industry sustainability. Such eco-efficient binders often contain large but variable proportions of industrial waste or by-products in their composition, many of which may be naturally occurring radioactive materials (NORMs). This study explored the application of a new gamma spectrometric method for measuring radionuclide activity in hybrid alkali-activated cements from solid 5 cm cubic specimens rather than powder samples. The research involved assessing the effect of significant variables such as the nature of the alkaline activator, reaction time and curing conditions to relate the microstructures identified to the radiological behavior observed. The findings showed that varying the inputs generated pastes with similar reaction products (C-S-H, C-A-S-H and (N,C)-A-S-H) but different microstructures. The new gamma spectrometric method for measuring radioactivity in solid 5 cm cubic specimens in alkaline pastes was found to be valid. The variables involved in hybrid cement activation were shown to have no impact on specimen radioactive content. The powder samples, however, emanated 222Rn (a descendent of 226Ra), possibly due to the deformation taking place in fly ash structure during alkaline activation. Further research would be required to explain that finding.

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“…Bulk density and total porosity (TP) was calculated before the determination of CS [22]. Determination of total sulphate and chloride contents was determined according to [23]. XRD method used to determination the phase compositions of the formed hydrates.…”

Section: Procedurementioning

confidence: 99%

Effect of sulphate, chloride and elevated temperature on the properties of Egyptian slag binder

ibrahime

Kishar

Heikal

et al. 2021

Journal of Scientific Research in Science

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The present research aims to explain the physico-chemical and mechanical characteristics of alkali activated slag geopolymer binder (AASGB). Commercial sodium hydroxide (SH) and sodium silicate liquid (SSL) are utilized as an alkaline activator at different temperature namely 25 o C and 65 o C.The hydration characteristics and physico-mechanical properties are illustrated through the determination of combined water contents Wn), combined slag, total porosity (TP), compressive strength (CS), bulk density (BD) and XRD analysis as spectroscopic tools upto 180 days. The durability of the AASGB against aggressive ions (sulphate and chloride ions ) as well as effect of elevated temperatures upto 1000 o C are studied. The activated binders are immersed under 5% MgSO4 and/or 5%MgCl2 solutions upto12 months. The data showed that the higher concentration of SH (1mol/kg) at 65 o C exhibited the highest resistance to elevated temperature upto 1000 o C as well as given a high resistance against sulphate and chloride attack.

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Preparation, physico-mechanical characteristics and durability of eco-alkali-activated binder from blast-furnace slag, cement kiln-by-pass dust and microsilica ternary system

Cited by 19 publications

References 69 publications

Incorporation of Cement Bypass Dust in Hydraulic Road Binder

Incorporation of Cement Bypass Dust in Hydraulic Road Binder

Hybrid Cements: Mechanical Properties, Microstructure and Radiological Behavior

Effect of sulphate, chloride and elevated temperature on the properties of Egyptian slag binder

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