Setting controlling of lithium slag-based geopolymer by activator and sodium tetraborate as a retarder and its effects on mortar properties

Wang, Jixiang; Han, Lupeng; Liu, Ze; Wang, Dongmin

doi:10.1016/j.cemconcomp.2020.103598

Cited by 82 publications

(26 citation statements)

References 44 publications

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“…That is why it is believed that that is also the efficiency scale of the reactions kinetics of alkaline activation, that is, that cesium is the most reactive and lithium the least, comparing these four alkali metals. The results found in the bibliography confirm this pattern of reaction kinetics [118], [119].…”

Section: Influence Of Activators On the Reaction Kinetics Of Aasupporting

confidence: 77%

“…Although there is research with other alkali metals, such as lithium and cesium, the availability of these materials is much less than that of sodium and potassium and makes research related to these materials much less frequent [117], [118]. In any case, the cation size scale is as follows: Cs> K> Na> Li.…”

Section: Influence Of Activators On the Reaction Kinetics Of Aamentioning

confidence: 99%

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Reaction mechanisms of alkali-activated materials

Marvila

Azevedo

Vieira

2021

Rev. IBRACON Estrut. Mater.

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The Alkali-Activated Materials (AAM) are defined as materials obtained through the reaction between precursors and activators, and are separated into two classes depending on the products formed in the reaction, those rich in calcium, as the blast furnace slag, whose Ca/(Si+Al) ratio is higher than 1; and poor in calcium, which is the geopolymers subclass. In this review article, some bibliographical aspects were discussed regarding the discovery of these materials, through research conducted by Victor Glukhovsky and through the characterization of historical monuments by Davidovits, which began in the 50s and 60s and persist to the present day. The main products obtained in the alkaline activation reaction were also addressed, using the definition of polysialates and zeolites, in the case of geopolymers, and the tobermorite structure, in the case of materials rich in calcium. The main steps of the alkali-activated reaction, such as dissolution, condensation, polycondensation, crystallization, and hardening, were discussed. Some techniques for characterizing the AA reaction products were also examined, such as X-ray diffraction (XRD), nuclear magnetic resonance spectrometry (NMR), Fourier transform infrared spectroscopy (FTIR), and scanning electron microscopy (SEM). Finally, the main factors that interfere in the kinetics of AA reactions were explored, in which the type of cure and the activating solution used in the alkali-activated materials production stands out.

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Section: Influence Of Activators On the Reaction Kinetics Of Aasupporting

confidence: 77%

Section: Influence Of Activators On the Reaction Kinetics Of Aamentioning

confidence: 99%

Reaction mechanisms of alkali-activated materials

Marvila

Azevedo

Vieira

2021

Rev. IBRACON Estrut. Mater.

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“…The underlying reason is that LSS can only accelerate the setting of PC grouting materials but it cannot significantly improve their mechanical properties. However, LSS can not only accelerate the setting of GBFS grouting materials, but it can also promote the further development of their mechanical properties, both emphasizing the characteristics of rapid setting, early strength, and high strength [ 43 ]. Therefore, the excitation effect of LSS in GBFS alkali-activated grouting materials is significantly better than that of PC grouting materials.…”

Section: Resultsmentioning

confidence: 99%

Coagulation Mechanism and Compressive Strength Characteristics Analysis of High-Strength Alkali-Activated Slag Grouting Material

Huang

Cui

et al. 2022

Polymers

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In deep coal mining, grouting reinforcement and water blockage are the most effective means for reinforcing the rock mass of extremely broken coal. However, traditional cement grouting materials are not suitable for use in complex strata because of their insufficient early mechanical strength and slow setting time. This study innovatively proposes using alkali-activated grouting material to compensate for the shortcomings of traditional grouting materials and strengthen the reinforcement of extremely unstable broken coal and rock mass. The alkali-activated grouting material was prepared using slag as raw material combined with sodium hydroxide and liquid sodium silicate activation. The compressive strength of specimens cured for 1 d, 3 d, and 28 d was regularly measured and the condensation behavior was analyzed. Using X-ray diffraction and scanning electron microscopy, formation behavior of mineral crystals and microstructure characteristics were further analyzed. The results showed that alkali-activated slag grouting material features prompt and high strength and offers the advantages of rapid setting and adjustable setting time. With an increase in sodium hydroxide content, the compressive strength first increased (maximum increase was 21.1%) and then decreased, while the setting time continued to shorten. With an increase in liquid sodium silicate level, the compressive strength increased significantly (and remained unchanged, maximum increase was 35.9%), while the setting time decreased significantly (and remained unchanged). X-ray diffraction analysis identified the formation of aluminosilicate minerals as the main reason for the excellent mechanical properties and accelerated coagulation rate.

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“…Recently, LS has been widely investigated to explore the possibility of adopting in cement and concrete to achieve the recycling of resources and benefits [5,10,11,13,16,[19][20][21][22][23][24]. LS contained higher than 80 wt% of SiO2 and Al2O3, more than 6 wt% of SO3 and a spot of CaO and Fe2O3 [2,18,21,25]. Crystalline minerals in LS included quartz (SiO2), leached spodumene (LiAlSi2O6) and gypsum (CaSO4•2H2O) [12,14].…”

Section: Introductionmentioning

confidence: 99%

“…To achieve higher early strength, previous scholars have done a lot of improvement works. The reactivity of LS could be enhanced via curing at high temperature [10,14], grinding to be finer particles [19,22,32] or utilizing chemical activators [5,21,24,31]. Overall, the application of early strength agent is recognized as the most effective technology for enhancing early strength [33,34], among which sodium silicate, sodium hydroxide, sodium sulfate and other alkali compounds were widely adopted as chemical additives [35][36][37].…”

Section: Introductionmentioning

confidence: 99%

Effects of C-S-Hs-PCE and Na2SO4 on hydration behavior of cement-lithium slag binder

Chen

Liu

et al. 2023

Preprint

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Application of C-S-Hs-PCE and sodium sulfate into Portland cement containing 20 wt% lithium slag (LS) powder was investigated, in order to strengthen early mechanical properties. Synergistic effects of C-S-Hs-PCE and sodium sulfate on hydration properties and microstructure of cement-LS system were analyzed. Results showed that C-S-Hs-PCE was advantageous for modifying fluidity of fresh LS-cement binder, while increased dosage of sodium sulfate decreased dispersibility of fresh paste. C-S-Hs-PCE and sodium sulfate exhibited a synergistic effect on strength enhancement, hydration acceleration as well as setting behavior of LS-cement binder. Sodium sulfate increased alkalinity of interstitial solution and promoted dissolution of LS. Dissolved Al and Si from LS powder reacted with dissolved sulfate ions from sodium sulfate to produce extra hydrates, and C-S-Hs-PCE accelerated pozzolanic reaction as well as hydration reaction via nucleation effect collaborated with dispersing effect. C-S-Hs-PCE accelerated reaction process of sodium sulfate via nucleation effect, and activation effect of sodium sulfate provided more newly-formed hydrates to act as nucleation seeds or crystal skeleton for induce hydration of new phases. The accelerated hydration generated more AFt and C-S-H gel in the matrix. Newly formed hydrates promoted exceedingly the appearance of network, leading to a refinement of pore structure as well as enhancement in mechanical strength. Application of LS into cement as a greener binder could be obtained by synergistic adoption of C-S-Hs-PCE and sodium sulfate.

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Setting controlling of lithium slag-based geopolymer by activator and sodium tetraborate as a retarder and its effects on mortar properties

Cited by 82 publications

References 44 publications

Reaction mechanisms of alkali-activated materials

Reaction mechanisms of alkali-activated materials

Coagulation Mechanism and Compressive Strength Characteristics Analysis of High-Strength Alkali-Activated Slag Grouting Material

Effects of C-S-Hs-PCE and Na2SO4 on hydration behavior of cement-lithium slag binder

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