Hydration properties and kinetic characteristics of blended cement containing lithium slag powder

Zhai, Mengyi; Zhao, Jihui; Wang, Dongmin; Wang, Yiren; Wang, Qibao

doi:10.1016/j.jobe.2021.102287

Cited by 30 publications

(26 citation statements)

References 43 publications

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“…Moreover, chemical reaction kinetics were analyzed based on the Krstulović-Dabić hydration kinetic model [8,107,108], and the corresponding kinetic parameters were extracted to explain hydration mechanism (Table 5).…”

Section: Hydration Heatmentioning

confidence: 99%

“…Due to the outstanding electrochemical properties, lithium has been applied widely in glass, pharmaceuticals, ceramic as well as lubrication industries, and demand quantity for lithium salts was continuously expanding recently [1,2]. During production process of lithium salts, enormous lithium slag (LS) produced from spodumene and lithium mica was emerged as industrial waste material [3][4][5][6][7][8][9], and more than 1 million tons of LS was released worldwide annually [4,7,10,11]. The discharged LS was heaped up outdoors, which occupied huge land resources, caused serious waste of natural resources and brought serious pollution [5,[12][13][14][15].…”

Section: Introductionmentioning

confidence: 99%

“…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].…”

Section: Introductionmentioning

confidence: 99%

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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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Section: Hydration Heatmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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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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“…e results show that the compressive strength, elastic modulus, dry shrinkage, and creep of mature concrete can be improved by adding appropriate amount of lithium slag into concrete. To clarify the properties of LS powder as a supplementary cementitious material, Zhai et al [8] studied the ionic solubility of LS powder and the hydration characteristics and hydration kinetics of LS powder mixed with cement.…”

Section: Introductionmentioning

confidence: 99%

Axial Compressive Behavior of Lithium Slag Recycled Coarse Aggregate Concrete-Filled Circular Steel Stub Columns

Wang

Liang

et al. 2022

Advances in Materials Science and Engineering

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In order to study the axial compression performance of lithium slag recycled concrete short columns in circular steel tubes, eight short columns were designed and tested. The main influence parameters of the specimens are lithium slag replacement rate and recycled concrete replacement rate. The test process and failure mode of the specimens are observed, and the load-displacement curve is drawn. The influence of the replacement rate on the axial compression performance of the specimens is analyzed. The results show that recycled concrete replacing natural coarse aggregate will reduce the mechanical properties of specimens, but lithium slag mixed into recycled concrete can compensate for the lack of mechanical properties of recycled concrete, and the specimens mixed with lithium slag and recycled concrete have good stiffness and ductility.

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“…[24], it was demonstrated that after adding hydrate seed-polycarboxylate (C-S-Hs-PCE) and sodium sulfate (SS), the setting time was shortened and the strength of cement paste improved drastically. The time of cement hydratation is also influenced by nanoparticles [25,26], or by mineral admixtures through the impact of backfill [27,28].…”

Section: Introductionmentioning

confidence: 99%

Logistic Model of Phase Transformation of Hardening Concrete

2022

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The objective of this study was to analyze the effects of the modification of cementitious materials with the admixture of a superplasticizer and mineral additive in the form of microsilica. We analyzed the hardening process of cementitious materials as an autocatalytic transformation from a viscous liquid to a pseudo-solid body. The main achievement of the research involved the identification of changes in the content of the solid phase during the hardening of concrete mix as a model of the logistic curve. The phase transformation process begins with a viscous liquid which consists of water, cement, microsilica, superplasticizer and sand. The laboratory tests comprised research on the development of the kinetics of hardening heat of binder cement pastes and the development of mechanical properties of concrete in the hardening process. Three groups of mixtures with different concentrations of binders, determined by different water–binder indexes, were used. The first group was made up by cement paste consisting of cement and water. The second group contained cement paste from the first group supplemented with a superplasticizer, and the third group comprised the cement paste as in the second group, but additionally modified with microsilica. Using appropriate analyses, we defined a mathematical model of the phase transformation process. The model was then used for computer-aided numerical analyses. This made it possible to compare the relevant parameters of the logistic curve obtained for the seven different concrete mixes analyzed. Active impact of the applied mineral additive (microsilica) and that of chemical admixture in the form of a superplasticizer was demonstrated. All approximations of the measurement results with the use of a logistic curve had a determination level of over 0.98, indicating high agreement.

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Hydration properties and kinetic characteristics of blended cement containing lithium slag powder

Cited by 30 publications

References 43 publications

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

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

Axial Compressive Behavior of Lithium Slag Recycled Coarse Aggregate Concrete-Filled Circular Steel Stub Columns

Logistic Model of Phase Transformation of Hardening Concrete

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