Analysis of Hydration Mechanism of New Type Filling Cementitious Materials

Nan, Shi Qing; Gao, Qian; Zhang, Juan Xia; Guo, Xian

doi:10.4028/www.scientific.net/amr.753-755.814

Cited by 3 publications

(3 citation statements)

References 4 publications

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“…The ettringite immediately crystallises into needle-like shapes with a large aspect ratio when water is added to calcium aluminate in the presence of calcium sulfate [11,15]. Needle-like ettringite crystals become densely entangled with calcium silicate hydrate (C-S-H), thus forming a network structure and filling the existing voids, which results in the hardening of the cement mixture [16][17][18].…”

Section: Introductionmentioning

confidence: 99%

Early hydration and mechanical strength of calcite–ettringite seeds added cement mixture for 3D printing

Lim

Kim

et al. 2021

Advances in Applied Ceramics

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Cement mixture with calcite-ettringite seeds (CE seeds) was investigated in terms of early hydration and mechanical property. The ettringite crystals of ettringite seeds (E seeds) exhibited needle-like shapes with lengths of approximately 3 μm, and the ettringite crystals of CE seeds exhibited rodlike shapes with lengths less than 1 μm. A dense growth of network-structured ettringite and calcium silicate hydrate (C-S-H) was observed. The amount of cement hydrates was analysed by thermal analysis, and the weight loss of the hydrates was 1.62% (E seeds) and 1.79% (CE seeds) at approximately 104°C, indicating that the amount of hydrates was higher in the mixture with CE seeds. The average pore diameter and porosity of the mixtures decreased from 145 to 79 nm and from 14.88% to 13.89% with the addition of CE seeds. The initial and final setting times of the mixture with CE seeds were 20 and 21 min, which were 4.76% and 8.70% shorter than the setting times of mixture with E seeds. The compressive and flexural strengths of the mixture with CE seeds were 6% and 10% higher than those of the mixture with E seeds, respectively.

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Section: Introductionmentioning

confidence: 99%

Early hydration and mechanical strength of calcite–ettringite seeds added cement mixture for 3D printing

Lim

Kim

et al. 2021

Advances in Applied Ceramics

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“…These activators usually include alkali metal hydroxides and silicates [13], and aluminum silicate materials are mainly fly ash, metakaolin, slag, steel slag, and copper slag [14][15][16][17][18]. The use of activators is an effective way to prepare geopolymers from smelting slag for engineering filling while improving the utilization rate, reducing the production cost, and reducing the greenhouse gas emission [19][20][21][22].…”

Section: Introductionmentioning

confidence: 99%

Alkali Activation of Copper and Nickel Slag Composite Cementitious Materials

Zhang

Zhi

et al. 2020

Materials

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Alkali-activated copper and nickel slag cementitious materials (ACNCMs) are composite cementitious materials with CNS (copper and nickel slag) as the main materials and GGBFS (ground-granulated blast-furnace slag) as a mineral admixture. In this paper, the activity indexes of CNS with different grinding times were studied using CNS to replace a portion of cement. NaOH, Na2SO4, and Na2SiO3 activators were used to study the alkaline solution of the CNS glass phase. The effects of the fineness of CNS and the type of activator on the hydration of ACNCMs were investigated via physical/mechanical grinding and chemical activation. The hydration products of ACNCMs were analyzed via XRD, SEM, FT-IR, TG, and MIP. The results of the study revealed that the activity indexes of CNS ground with different grinding times (10, 30 and 50 min) were 0.662, 0.689, and 0.703, respectively. When Na2SiO3 was used as the activator, the glass phase dissolved the most Si4+, Al3+, and Ca2+, and the respective concentrations in the solution were found to be 2419, 39.55, and 3.38 mg/L. Additionally, the hydration products of ACNCMs were found to have a 28-day compressive strength of up to 84 MPa.

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“…An effective way to use nonferrous smelting slag is to prepare filling cementitious material from large amounts of solid waste produced in mining and metallurgy [15,16,17,18]. The low gelling activity and difficulty in stimulating the nonferrous smelting slag are the main factors restricting the large-scale utilization of nonferrous smelting slag in China [19,20,21].…”

Section: Introductionmentioning

confidence: 99%

Experimental Studies on Chemical Activation of Cementitious Materials from Smelting Slag of Copper and Nickel Mine

Wang

Wei

et al. 2019

Materials

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Gellable composite materials (GCM) were prepared from a smelting slag of copper and nickel deposits and cement, and activated using gypsum and chemical activators. The effects of material ratio, dosage of chemical activators, and gypsum on the mechanical properties of GCM were studied. Our results showed that the chemical activators of Na2SO4, Na2SiO3, NaOH, and Na2CO3 could improve the compressive strength of the GCM. Considering the market cost and ease operation, the compressive strength of the GCM could be significantly improved with 2% Na2SO4. The experiment results also showed that the compound chemical activator could improve the compressive strength of gelled material. The strength of GCM reaches 41.6 MPa when 2% gypsum and 80% of smelting slags of copper and nickel deposits were used, which met the national standards requirements of GCM. As such, it is expected that a large amount of copper and nickel mining smelting slag could be utilized for the production of cementitious materials.

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Analysis of Hydration Mechanism of New Type Filling Cementitious Materials

Cited by 3 publications

References 4 publications

Early hydration and mechanical strength of calcite–ettringite seeds added cement mixture for 3D printing

Early hydration and mechanical strength of calcite–ettringite seeds added cement mixture for 3D printing

Alkali Activation of Copper and Nickel Slag Composite Cementitious Materials

Experimental Studies on Chemical Activation of Cementitious Materials from Smelting Slag of Copper and Nickel Mine

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