Design of self-desiccating binders using CSA cement: influence of the cement composition and sulfate source

Coumes, C. Cau Dit; Farcy, Oriane; Antonucci, Pascal; Champenois, Jean-Baptiste; Lambertin, David; Mesbah, Adel

doi:10.1680/jadcr.18.00100

Cited by 8 publications

(4 citation statements)

References 42 publications

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“…The first paper on thermodynamic modelling applied to the hydration of CSA cements appeared in 2010 [44]. Since then, numerous studies used thermodynamic modelling to assess the hydration mechanisms of ye'elimite [40,[45][46][47][48], CSA cements [24,[49][50][51][52][53][54], blended systems with OPC [4,[55][56][57] or SCMs [58][59][60][61][62][63] and durability issues of CSA based systems [41,42,[64][65][66][67][68][69].…”

Section: C2s + Ah3 + 5 H → C2ash8mentioning

confidence: 99%

CemGEMS – an easy-to-use web application for thermodynamic modeling of cementitious materials

Kulik¹,

Winnefeld²,

Кулик³

et al. 2021

RILEM Tech Lett

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Thermodynamic equilibrium calculations for cementitious materials enable predictions of stable phases and solution composition. In the last two decades, thermodynamic modelling has been increasingly used to understand the impact of factors such as cement composition, hydration, leaching, or temperature on the phases and properties of a hydrated cementitious system. General thermodynamic modelling codes such as GEM-Selektor have versatile but complex user interfaces requiring a considerable learning and training time. Hence there is a need for a dedicated tool, easy to learn and to use, with little to no maintenance efforts. CemGEMS (https://cemgems.app) is a free-to-use web app developed to meet this need, i.e. to assist cement chemists, students and industrial engineers in easily performing and visualizing thermodynamic simulations of hydration of cementitious materials at temperatures 0-99 °C and pressures 1-100 bar. At the server side, CemGEMS runs the GEMS code (https://gems.web.psi.ch) using the PSI/Nagra and Cemdata18 chemical thermodynamic data-bases (https://www.empa.ch/cemdata). The present paper summarizes the concepts of CemGEMS and its template data, highlights unique features of value for cement chemists that are not available in other tools, presents several calculated examples related to hydration and durability of cementitious materials, and compares the results with thermodynamic modelling using the desktop GEM-Selektor code.

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Section: C2s + Ah3 + 5 H → C2ash8mentioning

confidence: 99%

CemGEMS – an easy-to-use web application for thermodynamic modeling of cementitious materials

Kulik¹,

Winnefeld²,

Кулик³

et al. 2021

RILEM Tech Lett

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show abstract

“…the blending ratio between ye'elimite resp. CSA clinker and calcium sulphate [5,13,14,23,51,68], the influence of belite content on the hydration products [13,14,19], the amount of supplementary cementitious materials added such as limestone [76,141,[188][189][190], fly ash [138] or metakaolin [191], or the blending with Portland cement [128,188] or hydrated lime [192].…”

Section: Thermodynamics In Ye'elimite Systemsmentioning

confidence: 99%

Advances in understanding ye'elimite-rich cements

Haha

Winnefeld²,

Pisch³

2019

Cement and Concrete Research

107

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In this review, we discuss the recent advances in understanding ye'elimite-rich cements. These cements can be classified as follows:(1) low belite one namely called calcium sulphoaluminate cements (CSA) where the main use is in special applications or when combined with OPC and calcium sulphate sources in structural application (2) High belite one namely Belite Ye'elimite ferrite cement (BYF) where their development as an alternative low carbon binders is aimed to replace Portland clinker in structural applications.The main hydrating phase at early age in both systems is ye'elimite. Its formation, its reactivity and its extent of reaction and space filling when hydrating define the properties of the cement. Recent advances in understanding these properties are critically analyzed.Recent activities on the clinker formation and production at laboratory and industrial scale are reported. Additionally, the effects of aluminates rich minerals are reviewed in detail, with a focus on their influence on the hydration mechanism and the resulting hydrates assemblage and its stability in ye'elimite rich systems. Applicability of thermodynamic calculation and its limitations are discussed to underline the role of the environment at each reaction step on the hydrates assemblage.

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“…85%, compared with 30% for C-S-H, due to its water-rich structure (Ideker et al, 2019). In commercial CSA cement, self-desiccation depends on the cement composition, calcium sulfate source, W/C ratio, and curing conditions (Coumes et al, 2019). In alternative ettringite-binders, this property has not yet been quantified.…”

Section: Introductionmentioning

confidence: 99%

Self-Desiccation of a Vernacular CSA Binder

Martins

Çiçek

Brumaud

et al. 2022

Construction Technologies and Architecture

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The fast precipitation of ettringite in conventional Calcium Sulfo Aluminate (CSA) cement causes rapid stiffening of the cement paste and is directly associated with short setting times and self-desiccation. To extend the time during which those types of cement remain workable, retarding admixtures can be used. However, retarders may affect the amounts and types of hydration products formed and as a consequence the ability of hydrated cement to chemically bind water. This work investigates the influence of two natural-based admixtures on the self-desiccation ability of a vernacular CSA ternary binder used as earth stabilization. Vicat measurements were used to study the efficiency of citric acid and sucrose as retarding admixtures on the setting time of stabilized earth. A quantitative study of the self-desiccation ability of the binder was performed on dried binder pastes using thermogravimetric analysis (TGA). Results show that both admixtures have a significant impact on the setting time of the binder. Furthermore, TGA showed that the self-desiccation ability of this vernacular CSA binder is significantly reduced when citric acid at high dosages is used, both at early hydration and after 14 days. On the contrary, the use of sucrose does not affect the water chemically bound at an early age but can maximize bound water after 14 days of hydration.

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Design of self-desiccating binders using CSA cement: influence of the cement composition and sulfate source

Cited by 8 publications

References 42 publications

CemGEMS – an easy-to-use web application for thermodynamic modeling of cementitious materials

CemGEMS – an easy-to-use web application for thermodynamic modeling of cementitious materials

Advances in understanding ye'elimite-rich cements

Self-Desiccation of a Vernacular CSA Binder

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