Effect of coupled B/Na and B/Ba doping on hydraulic properties of belite-ye’elimite-ferrite cement

Li, Chen; Wu, Mei; Yao, Wu

doi:10.1016/j.conbuildmat.2019.02.163

Cited by 29 publications

(16 citation statements)

References 78 publications

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“…This "superposition effect" can efficiently promote hydrothermal synthesis reaction of active components and lime, accelerate the hydrothermal synthesis rate, and improve the specific surface area, reactivity as well as the total content of cementitious minerals. To date, most research works [15][16][17] have focused on improving the hydrothermal synthesis process, while little is known regarding the mineral structure, properties and synergistic hydration mechanism. In this paper, we analyze the synergistic hydration and performance of FABC and Portland cement, and reveal the activity and function of C 2 S and C 12 A 7 synthesized at low temperatures.…”

Section: Introductionmentioning

confidence: 99%

Effect of Fly Ash Belite Cement on Hydration Performance of Portland Cement

et al. 2021

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Fly ash belite cement is a green, low carbon cementitious material, mainly composed of hydraulic minerals of dicalcium silicate and calcium aluminate. In this study, we used fly ash belite cement to control the setting time, hydration heat, strength, composition and microstructure of hydration products in Portland cement. Results showed that incorporating fly ash belite cement into Portland cement can shorten the setting time, accelerate hydration reaction speed, enhance early hydration heat release rate of silicate minerals and reduce total hydration heat. Moreover, replacing composite cement with 30% FABC causes the 90 d compressive strength of pastes and mortars to reach 107 and 46.2 MPa, respectively. The mechanical properties can meet the requirements of P·F 42.5 cement. During the hydration reaction process, clinker and Portland cement have a synergistic hydration effect. Notably, hydration of fly ash belite cement promotes the formation of C-S-H gel, Ettringite and calcium hydroxide, thereby significantly enhancing long-term strength. With the increase of FABC contents, the long-term strength would be improved with the densification of hydration products. The porosity has a great influence on the strength, and the high porosity was the main cause of the low early strength of FABC pastes. FABC and its composite cement show promise for mass concrete applications and can be applied as a setting agent for Portland cement.

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Section: Introductionmentioning

confidence: 99%

Effect of Fly Ash Belite Cement on Hydration Performance of Portland Cement

et al. 2021

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“…This calcium sulfate (CaSO 4 · 2H 2 O) content can be transferred into a calcium sulfate to ye’elimite molar ratio (value M) of 1.5. According to a formula for calculating the optimum sulfate level for calcium sulfoaluminate cement, a value M between 0 and 1.5 yields rapid hardening and high strength properties [32,33]. When CSA cement is mixed with water, ye’elimite reacts quickly with calcium sulfate and results in the formation of ettringite (C 6 A$ 3 H 32 ) and aluminum hydroxide (AH 3 ) as shown in Equation (1) [27].…”

Section: Resultsmentioning

confidence: 99%

“…When CSA cement is mixed with water, ye’elimite reacts quickly with calcium sulfate and results in the formation of ettringite (C 6 A$ 3 H 32 ) and aluminum hydroxide (AH 3 ) as shown in Equation (1) [27]. The formation of ettringite fills the available space rapidly, providing the paste with good early-age strength [32].…”

Section: Resultsmentioning

confidence: 99%

“…However, the simultaneously hydration reactions of ye’elimite, belite and brownmillerite caused complex reactions to occur. Belite may react with aluminum hydroxide, that is formed by the hydration of ye’elimite, and the main crystalline product is strätlingite (C 2 A$H 8 ), as seen in Equation (4), and may be continuously reacting to form hydrogarnet (C 3 A$ x H 6-2x ), as seen in Equation (5) [32]. On the other hand, calcium hydroxide, mainly generated from the hydration of belite, may be combined with ye’elimite and gypsum, and also generated expansive ettringite as shown in Equation (6) [34].…”

Section: Resultsmentioning

confidence: 99%

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Utilization of Several Industrial Wastes as Raw Material for Calcium Sulfoaluminate Cement

Julphunthong

Joyklad

2019

Materials

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The aim of this research was to study the production of calcium sulfoaluminate (CSA) cement from several industrial waste materials including with marble dust waste, flue gas desulfurization gypsum, ceramics dust waste, and napier grass ash. The chemical composition, microstructure, and phase composition of raw materials were examined using energy dispersive X-ray fluorescence (EDXRF), scanning electron microscopy (SEM), and X-ray diffraction (XRD), respectively. All raw wastes were analyzed using their chemical composition to assign proportion for raw mixture. The raw mixture is calcined at controlled calcination temperatures ranging from 1200 °C to 1300 °C for 30 min. Subsequently, with analysis, their phase composition is calculated by the Rietveld refinement technique. The results suggested that phase composition of clinker calcined at 1250 °C shows the closest composition when compared to target phases, and was selected to prepare CSA cement. The FTIR analysis was performed to study the hydration processes of CSA cement. The Ordinary Portland cement (OPC) based with adding CSA cement between 20 wt.% and 40 wt.% were investigated for the effect of CSA cement fraction on water requirement, setting times and compressive strength. The results showed that rapid setting and high early strength can be achieved by the addition of 20–40 wt.% CSA cement to OPC.

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“…During the ionic transportation, chemical reactions can take place. For example, SO4 2-can react with monosulfate to form ettringite [1,20,26]. This reaction impacts not only the mass transport of SO4 2-but also the strength of Ca 2+ and AlO2by disturbing the equilibrium between the hydration products and the pore solution.…”

Section: Introductionmentioning

confidence: 99%

Understanding the sulfate attack of Portland cement–based materials exposed to applied electric fields: Mineralogical alteration and migration behavior of ionic species

Jiang

Myers

et al. 2020

Cement and Concrete Composites

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The magnesium and sodium sulfate attacks on Portland cement paste in the presence of applied electric fields were studied, and the mineralogical alterations were investigated by both experiments and thermodynamic modeling.When an electric current flows out of the cement paste, the electric migration of ions induced sulfate ingress and decalcification. Compared with the specimen exposed to Na2SO4, that exposed to MgSO4 for 28 d proceeded to a later degradation stage, which is characterized by the decomposition of ettringite, portlandite, and AFm phases, and the formation of CaSO4. Thermodynamic modeling indicates a neutralization process induced by the electric migration of OH -, which is potentially responsible for the decomposition of ettringite. When an electric current flows into the cement paste, the Mg 2+ and Na + showed different migration behavior. Mg 2+ was incorporated to form brucite and M-S-H-like products in a shallow area (~100 μm) on the surface of the specimen, whilst a part of the Na + could be bonded to form Na-rich silica gel with the other part penetrating through the specimen. By coupling the pore solution chemistry obtained from thermodynamic modeling with the Nernst-Planck equation, the migration behaviors of the ionic species (SO4 2-, Mg 2+ , and Na + ) were analyzed.

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Effect of coupled B/Na and B/Ba doping on hydraulic properties of belite-ye’elimite-ferrite cement

Cited by 29 publications

References 78 publications

Effect of Fly Ash Belite Cement on Hydration Performance of Portland Cement

Effect of Fly Ash Belite Cement on Hydration Performance of Portland Cement

Utilization of Several Industrial Wastes as Raw Material for Calcium Sulfoaluminate Cement

Understanding the sulfate attack of Portland cement–based materials exposed to applied electric fields: Mineralogical alteration and migration behavior of ionic species

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