Experimental comparisons between one-part and normal (two-part) alkali-activated slag binders

Ren, Jie; Sun, Hongfang; Li, Qun; Li, Zhenming; Ling, Li; Zhang, Xiaogang; Wang, Yanshuai; Xing, Feng

doi:10.1016/j.conbuildmat.2021.125177

Cited by 51 publications

(25 citation statements)

References 54 publications

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“…This can be attributed to the shrinkage during curing or sample preparation (Li et al, 2021). Small amounts of C-S-H (I) can also be found attached to the matrix phases, which is consistent with the results of (Ren et al, 2021). Figure 5B reveals that a substantial amount of N-(C)-A-S-H gel (petal-shaped) accumulated into clusters in the RSP4.2 sample, as indicated in the reaction kinetics analysis.…”

Section: Hydration Productssupporting

confidence: 81%

Effect of rice straw powder on properties of one-part alkali-activated slag

Yin

Jiang

Wang

et al. 2022

Front. Built Environ.

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One-part alkali-activated slag (AAS) as a binder material has a promising application in the construction industry. The properties of one-part AAS incorporating agricultural wastes have been seldom studied. In this paper, the fresh and hardened properties of one-part AAS with the addition of rice straw powder (RSP) were investigated. The reaction rate in the acceleration period of AAS is reduced by RSP. The compressive strength of the mixture decreases with the introduction of RSP, while the flexural strength increases. The porosity of the hardened mixtures becomes lower when RSP was incorporated. N-(C)-A-S-H gel was detected in the system when 4.2% RSP was present. The RSP reduces the early-age autogenous shrinkage of AAS by providing internal curing to the matrix, but its effect on long-term drying shrinkage is limited.

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Section: Hydration Productssupporting

confidence: 81%

Effect of rice straw powder on properties of one-part alkali-activated slag

Yin

Jiang

Wang

et al. 2022

Front. Built Environ.

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“…They observed an increase of temperature during the mixing procedure and a slower setting time for one-part when compared to two-part. However, the obtained materials exhibited similar workability and reached compressive strengths after 28 days of 60 MPa as one-part, and 67 MPa as two-part [10]. A prior study from Nematollahi et al [17] synthesized one-part mixes using a mixture of class F fly ash, GGBFS, calcium hydroxide with different grades of sodium hydroxides and sodium silicates as the alkali activators.…”

Section: Introductionmentioning

confidence: 92%

“…Thereafter, two main pathways are used for the synthesis of AAMs [6,10]: two-part and one-part mix. Most of the current research and applications of AAMs are produced by a two-part mix, which is comprised by the reaction of a concentrated alkali aqueous solution and a solid precursor.…”

Section: Introductionmentioning

confidence: 99%

“…The precursor and solid activator can be ground separately and combined after, or they can be co-ground. The one-part approach has been seen to lower the mechanical performance; however, it has gained attention in the last decade from both academia and industrial sectors as it provides safer and easier-to-handle approach for cast-in-situ applications, for instance, than the two-part approach [10]. Nevertheless, it should be noted that the very first publications on AAMs more than 120 years ago were based on the onepart approach [11,12].…”

Section: Introductionmentioning

confidence: 99%

“…Even though there is a significant amount of research published on the mechanical properties and different mix design options of one-part synthesis [13][14][15][16], there is a lack of documentation on the difference between one-and twopart alkali-activated binders using identical mix designs in terms of molar ratios of SiO 2 , Al 2 O 3 , and Na 2 O in both cases. A recent study from Ren et al [10] compared one-part and two-part synthesis of alkali-activated GGBFS mortars with a water-to-solids ratio of 0.4 and using anhydrous metasilicate as solid activator. They observed an increase of temperature during the mixing procedure and a slower setting time for one-part when compared to two-part.…”

Section: Introductionmentioning

confidence: 99%

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Comparison of One-Part and Two-Part Alkali-Activated Metakaolin and Blast Furnace Slag

Segura

Suopajärvi

Yliniemi

et al. 2022

J. Sustain. Metall.

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One-part alkali-activated materials prepared with solid-form alkali activator are gaining attention in the construction industry, as they are an easier and safer approach for cast-in-situ applications in comparison with two-part approach (i.e., involving the use of alkali-activator solutions). The present study compares the one-part and conventional two-part mixing methods with two aluminosilicate precursors, metakaolin and ground granulated blast-furnace slag, using identical mix designs (in terms of molar ratios of SiO2, Al2O3, and Na2O) with both preparation methods. The results revealed that using one-part mix delays the setting time, increases the heat of reaction, decreases the shrinkage, and reaches between 80 and 85% of the compressive strength of the two-part mix. In addition, scanning electron microscopy, thermogravimetric analysis, and X-ray diffraction analysis showed no major differences between one- and two-part. However, energy-dispersive X-ray spectroscopy and magic angle spinning nuclear magnetic resonance experiments indicated that the extent of reaction in two-part alkali-activated mixes is higher than for one-part. Graphical Abstract

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Effect of fly ash and gypsum on drying shrinkage and mechanical properties of one‐part alkali‐activated slag mortar

Chen,

Zhang,

Chen

et al. 2024

Structural Concrete

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One‐part alkali‐activated materials can be processed into semi‐finished products by mixing a solid activator with the powder. They only require the addition of water, which greatly improves their commercial feasibility. So, we used one‐part alkali‐activated slag mortar to investigate the effects of the dosages of the activator (sodium metasilicate), fly ash (FA), and gypsum on its fluidity, flexural strength, compressive strength, and drying shrinkage. The microscopic mechanisms of the mortar were analyzed using scanning electron microscopy and x‐ray diffraction. The below conclusions were drawn. First, the drying shrinkage and compressive strength of the mortar gradually increased with the increase of the activator dosage. Second, the drying shrinkage of the mortar initially decreased and then increased as increasing FA substitution, while the compressive strength decreased gradually in the early stage and then increased and decreased in the later stage. Lastly, by increasing the gypsum dosage, the drying shrinkage of the mortar was significantly reduced. However, the compressive strength gradually decreased. Besides, when adding 20% of FA and 2.4% of gypsum, it was found that ettringite, which underwent expansion, formed in the system. This not only reduced the drying shrinkage by 25.3% but also increased the compressive strength by 1.3%. Furthermore, our investigation has led to the development of a low‐shrinkage one‐part alkali‐activated slag and FA mortar, which not only facilitates the recycling of solid waste materials but also presents commendable environmental and economic advantages.

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Experimental comparisons between one-part and normal (two-part) alkali-activated slag binders

Cited by 51 publications

References 54 publications

Effect of rice straw powder on properties of one-part alkali-activated slag

Effect of rice straw powder on properties of one-part alkali-activated slag

Comparison of One-Part and Two-Part Alkali-Activated Metakaolin and Blast Furnace Slag

Effect of fly ash and gypsum on drying shrinkage and mechanical properties of one‐part alkali‐activated slag mortar

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