The influence of gypsum ratio on the mechanical performance of slag cement accelerated by calcium sulfoaluminate cement

Michel, Marie; Georgin, Jean‐François; Ambroise, J.; Péra, J.

doi:10.1016/j.conbuildmat.2010.09.015

Cited by 53 publications

(24 citation statements)

References 6 publications

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“…When NaCl and/or gypsum were incorporated in this study, hydrotalcite was mostly removed, and the use of NaCl ( , which is known as a strength enhancing material by filling pores [12,37]. These reaction products have often been observed in earlier studies of construction binders containing chloride [13,[38][39][40] or sulfate sources [12,41,42].…”

Section: C-s-h Hydrotalcite Ca(oh) 2 Ettringite Hydrocalumitementioning

confidence: 82%

Gypsum-Dependent Effect of NaCl on Strength Enhancement of CaO-Activated Slag Binders

et al. 2018

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This study explores the combined effect of NaCl and gypsum on the strength of the CaO-activated ground-granulated blast furnace slag (GGBFS) binder system. In the CaO-activated GGBFS system, the incorporation of NaCl without gypsum did not improve the strength of the system. However, with the presence of gypsum, the use of NaCl yielded significantly greater strength than the use of either gypsum or NaCl alone. The presence of NaCl largely increases the solubility of gypsum in a solution, leading to a higher concentration of sulfate ions, which is essential for generating more and faster formations of ettringite in a fresh mixture of paste. The significant strength enhancement of gypsum was likely due to the accelerated and increased formation of ettringite, accompanied by more efficient filling of pores in the system.

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Section: C-s-h Hydrotalcite Ca(oh) 2 Ettringite Hydrocalumitementioning

confidence: 82%

Gypsum-Dependent Effect of NaCl on Strength Enhancement of CaO-Activated Slag Binders

et al. 2018

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“…The TG/DTG curves of samples after 28 days hydration are given in Fig.6. At up to 300°C, the weight loss mainly corresponding to the thermal decomposition of C-S-H, according to [11,17,34,38,46], were observed in all pastes. The small shoulders around 80°C present the decomposition of ettringite [47,48], which originates from the sulphate content in the raw GGBS and CaO.…”

Section: Thermogravimetric Analysis (Tga)mentioning

confidence: 96%

Mechanical and hydration properties of ground granulated blastfurnace slag pastes activated with MgO–CaO mixtures

Jin

Al‐Tabbaa

et al. 2014

Construction and Building Materials

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Since alkali-activated slag using conventional activators suffers from economical and technical problems, other alternative activators should be explored. This paper reports the results of an investigation into the activation of ground granulated blastfurnace slag by using 10% (by weight) reactive MgO, CaO and their mixtures with various ratios. The mechanical and hydration properties of pastes were examined up to 90 days. It was found that the strength of slag pastes activated with MgO-CaO mixtures decreased with the increasing ratio of MgO to CaO in the early age while a much steeper strength gain was observed in pastes with MgO/CaO higher than 19/1 after 28 days and longer. The addition of small amount of CaO in MgO can greatly accelerate the hydration of slag in the early age by increasing the pH of pore solution. However, pastes showed small difference in strength development at each period when MgO/CaO was less than 1. The main hydration products, analysed by XRD, TGA and SEM/EDS, were C-S-H and hydrotalcite-like phases. While CaO accelerated the formation of C-S-H in the early age, MgO induced more amount of hydrotalcite-like phases, which notably enhanced the strength of slag pastes with high MgO content after 28 days and longer. Calcite, portlandite and residual MgO were also observed, depending on the MgO/CaO ratio and the hydration time. This work indicated that the replacement of MgO by CaO can make the application of reactive MgO in slag activation more economical.

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“…[5,10]. The AFt formed in the presence of Portlandite is expansive, and the presence of CH could enhance the hydration of C 4 A 3 $ [35,39].…”

Section: Hydration Products Of the Cementmentioning

confidence: 99%

“…[10,39]. The contents of CH and AFt were calculated from the weight loss during the dehydration (see Fig.…”

Section: Hydration Products Of the Cementmentioning

confidence: 99%

Hydration properties of the alite–ye’elimite cement clinker synthesized by reformation

Shen

et al. 2015

Construction and Building Materials

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The influence of gypsum ratio on the mechanical performance of slag cement accelerated by calcium sulfoaluminate cement

Cited by 53 publications

References 6 publications

Gypsum-Dependent Effect of NaCl on Strength Enhancement of CaO-Activated Slag Binders

Gypsum-Dependent Effect of NaCl on Strength Enhancement of CaO-Activated Slag Binders

Mechanical and hydration properties of ground granulated blastfurnace slag pastes activated with MgO–CaO mixtures

Hydration properties of the alite–ye’elimite cement clinker synthesized by reformation

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