Hydrothermal synthesis of calcium sulfoaluminate–belite cement from industrial waste materials

Rungchet, A.; Chindaprasirt, Prinya; Wansom, S.; Pimraksa, Kedsarin

doi:10.1016/j.jclepro.2015.12.068

Cited by 89 publications

(34 citation statements)

References 39 publications

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“…This region is characteristic of crystalized water and corresponds to the decomposition of Ca(OH) 2 . The confrontation of these observations with the concerned literature show that the range between 50°C and 300°C is generally attributed to decomposition of ettringite, C\ \S\ \H, C\ \A\ \H and monosulfoaluminate, whereas the range from 400°C to 500°C is attributed to decomposition of calcium hydroxide [51][52][53][54][55].…”

Section: Structural and Thermal Behavior Of Slag Cement Pastementioning

confidence: 82%

Efficiency of high energy over conventional milling of granulated blast furnace slag powder to improve mechanical performance of slag cement paste

Bouaziz

Hamzaoui²,

Guessasma

et al. 2017

Powder Technology

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This work aims at bridging the efficiency of ball milling of granulated blast furnace slag (GBFS) to the structural and mechanical properties of slag cement pastes. Both conventional and high energy milling of GBFS are considered with a milling duration varied between 1 and 10 h. X-ray diffraction, infra-red spectroscopy, granulometry analysis and scanning electron microscopy are used to draw the main lines of structural and Morphological changes occurring during milling. Cement pastes formulated using 45% of GBFS in substitution are Characterized. Workability, X-ray diffraction analysis, differential scanning calorimetry and compressive testing ate performed to analyse main structural changes and reactions driven by the presence of milled GBFS as well as its direct consequence on the mechanical strength of slag cement pastes. Slag milling indicates the superior efficiency of high-energy milling, which allows a maximum slag finesse of 1.79 m(2)/g after 3 h of milling. Major structural changes occur during the first 3 h of high energy milling while conventional milling does not induce any remarkable trend. These changes concern amorphisation of the bulk structure in addition to the fracturing and agglomeration of slag particles. Workability of slag cement pastes is remarkably improved when using 1 h of high-energy slag milling. This result is consistent with slag finesse trend with respect to milling time and with the improvement of GBFS reactivity. The substitution of 45% of cement (CEM I 52.5) by GBFS is only beneficial at the condition of performing high-energy milling for at least 1 h

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Section: Structural and Thermal Behavior Of Slag Cement Pastementioning

confidence: 82%

Efficiency of high energy over conventional milling of granulated blast furnace slag powder to improve mechanical performance of slag cement paste

Bouaziz

Hamzaoui²,

Guessasma

et al. 2017

Powder Technology

View full text Add to dashboard Cite

show abstract

“…) has shown that the interaction volumes can be significantly larger than the sizes of the crystals present in a cement paste, as already shown in an earlier study (Wong & Buenfeld, ). Indeed, some recent studies on calcium sulphoaluminate cements have illustrated micrometric ettringite (Rungchet et al ., ) as complex intergrowths with other cementitous phases, which are thus likely to be analysed as a whole.…”

Section: Discussion and Perspectivesmentioning

confidence: 97%

The elusive ettringite under the high‐vacuum SEM – a reflection based on natural samples, the use of Monte Carlo modelling of EDS analyses and an extension to the ettringite group minerals

Thiéry

Trincal

Davy

2017

Journal of Microscopy

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Ettringite, Ca Al (SO ) (OH) .26H O, or C AS¯ H as it is known in cement chemistry notation, is a major phase of interest in cement science as an hydration product and in polluted soil treatment since its structure can accommodate with many hazardous cations. Beyond those anthropogenic features, ettringite is first of all a naturally occurring mineral (although rare). An example of its behaviour under the scanning electron microscope and during energy dispersive spectroscopy (EDS) qualitative analysis is presented, based on the study of natural ettringite crystals from the N'Chwaning mine in South Africa. Monte Carlo modelling of the electron-matter interaction zone at various voltages is presented and confronted with actual, observed beam damage on crystals, which burst at the analysis spot. Finally, theoretical energy dispersive spectroscopy spectra for all the ettringite group minerals have been computed as well as Monte Carlo modelling of the electron-matter interaction zone. The knowledge of the estimation of the size of this zone may thus be helpful for the understanding of energy dispersive spectroscopy analysis in cement pastes or ettringite-remediated soils.

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“…Needlelike CH and CSH-the key hydration products in strength gain at advanced age-are ubiquitous in Figure 5a. Besides, ettringite increases the expansibility of concrete to about 120% and improves the flowability of a backfilling slurry [20].…”

Section: Viscometer Testmentioning

confidence: 99%

Cemented Backfilling Technology of Paste-Like Based on Aeolian Sand and Tailings

2016

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Aeolian sand, tailings, and #32.5 Portland cement were used to produce backfilling aggregate, and physicochemical evaluations and proportioning tests were conducted. It is revealed that a mixture of aeolian sand and tailings can be used as a backfilling aggregate for the complementarities of their physicochemical properties; e.g., high Al 2 O 3 content in the aeolian sand and CaO content in the tailings, coarse particles of aeolian sand and fine particles of tailings, etc. In addition, the optimal backfilling aggregate was shown to have a mass fraction of 72%-74%, a cement-sand ratio of 1:8, and an aeolian sand proportion of 25%. Furthermore, viscometer tests were used to analyze the rheological characteristics, and the slurry in these optimized proportions exhibited shear thinning phenomena with an initial yield stress, which belongs to paste-like-a cemented backfilling slurry with a higher mass fraction than a two-phase flow and better flowability than a paste slurry. Finally, the application of this backfilling technology shows that it can not only realize safe mining, but also bring huge economic benefits, and has some constructive guidance for environmental protection.

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Hydrothermal synthesis of calcium sulfoaluminate–belite cement from industrial waste materials

Cited by 89 publications

References 39 publications

Efficiency of high energy over conventional milling of granulated blast furnace slag powder to improve mechanical performance of slag cement paste

Efficiency of high energy over conventional milling of granulated blast furnace slag powder to improve mechanical performance of slag cement paste

The elusive ettringite under the high‐vacuum SEM – a reflection based on natural samples, the use of Monte Carlo modelling of EDS analyses and an extension to the ettringite group minerals

Cemented Backfilling Technology of Paste-Like Based on Aeolian Sand and Tailings

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