Effects of alternative calcium sulphate-bearing materials on cement characteristics in vertical mill and storing

Hassan, Sherif; Salah, Hamdy; Shehata, Nabila

doi:10.1016/j.cscm.2021.e00489

Cited by 6 publications

(2 citation statements)

References 29 publications

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“…As the anhydrite content increased, the initial and final setting times of the APC decreased because the anhydrite promoted the hydration of the APC. The XRD results (see Section 3.2 ) indicated that ettringite (3CaO•Al 2 O 3 •3CaSO 4 •32H 2 O, or AFt for short) had formed due to the reaction of APC and anhydrite [ 27 ], accelerating the formation of a skeleton in the cement paste because of acicular crystals. Portland cement sets quickly if no gypsum is added due to the rapid hydration of C 3 A.…”

Section: Resultsmentioning

confidence: 99%

Influence of Anhydrite on the Properties and Microstructure of Aluminophosphate Cement

et al. 2022

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Aluminophosphate cement (APC) is a new type of hydraulic cementitious material with many potential functions. Microscopic analysis techniques were used to study the effect of anhydrite on the performance and hydration process of APC under standard curing conditions. The results show that adding an appropriate amount of anhydrite promotes the hydration of APC. The highest compressive strength is reached at an anhydrite content of 15 wt.%. As the anhydrite content increases, the APC’s compressive strength decreases. The microscopic analysis of the hydration product morphology shows that the incorporation of anhydrite produces ettringite and other hydration products, improving the microstructure of the cement paste. The mercury intrusion porosimetry results show that the total porosity of the hardened APC paste decreases, and the microstructure becomes denser with an increase in the curing age, resulting in an increase in the compressive strength over time.

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Section: Resultsmentioning

confidence: 99%

Influence of Anhydrite on the Properties and Microstructure of Aluminophosphate Cement

et al. 2022

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“…Because of the strong interaction with the various mineral phases of the cement, the admixture interferes in several phenomena. The SO4 -2 ions added intentionally in the cement manufacture act as hydration controllers reacting with the aluminate phases preferentially, and the polynaphthalene sulfonate base admixture or polycarboxylate also have higher affinity for the aluminate phases, competing with the sulfates for surface area on the aluminate phases [14]. Moreover, the PCE can intercalate on hydration compounds formation by different mechanisms, it can explain the distinct content of the same admixture on pre-hydrated and nonpre-hydrated mixes.…”

Section: Portland Cement and Admixtures Interactionsmentioning

confidence: 99%

Effect of prehydration of Portland cement on the superplasticizer consumption and the impact on the rheological properties and chemical reaction

Ferraz

Martho

Burns

et al. 2023

Rev. IBRACON Estrut. Mater.

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The use of pre-hydrated cement in formulation of mortar and concrete is common because there is not always effective control on the cement production, grinding, transportation and subsequent storage. This paper presents a case study on the optimization of admixture for use with prehydrated cement by assessing changes in the rheological properties of Portland cement artificially pre-hydrated. The cement was artificially pre-hydrated by exposure to relative humidity (RHs) of 90%, in an environment of NH4Cl saturated solution. Additionally, the cement pastes were evaluated with and without superplasticizer. Stepped flow test using a parallel-plate geometry was the method choose to evaluate the rheological behavior, apparent viscosity, yield stress and hysteresis area of each paste at the early age. Oscillatory rheometry was conducted to evaluate the storage modulus (G’), comparing the consolidation with the hydration kinetics obtained by calorimetric evaluation of the same suspensions. Initial rheometer results indicate that the pre-hydrated sample presents lower level of shear stress than the reference sample, because of the higher reactivity of the non-pre-hydrated sample.

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Application of Bacillus mucilaginosus in the carbonation of steel slag

Jin

Zhang

Liu

et al. 2021

Appl Microbiol Biotechnol

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Effects of alternative calcium sulphate-bearing materials on cement characteristics in vertical mill and storing

Cited by 6 publications

References 29 publications

Influence of Anhydrite on the Properties and Microstructure of Aluminophosphate Cement

Influence of Anhydrite on the Properties and Microstructure of Aluminophosphate Cement

Effect of prehydration of Portland cement on the superplasticizer consumption and the impact on the rheological properties and chemical reaction

Application of Bacillus mucilaginosus in the carbonation of steel slag

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