A chemical/mineralogical investigation of the behavior of sulfoaluminate binders submitted to accelerated carbonation

Gastaldi, Daniela; Bertola, Federica; Canonico, Fulvio; Buzzi, Luigi; Mutke, Sabine; Irico, Sara; Paul, Geo; Marchese, Leonardo; Boccaleri, Enrico

doi:10.1016/j.cemconres.2018.04.006

Cited by 48 publications

(23 citation statements)

References 28 publications

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“…When CSA is exposed to a CO 2 content of 1 vol.-%, the pore distribution coarsens to resemble that of day 1. This is similar to the observations of Gastaldi et al that microstructure of a sample stored for 28 days under water is coarser than that of a sample stored for 28 days at 4 vol.-% CO 2 [80]. The observations of Hargis for a w/b of 0.65 are in agreement with the results presented here [19].…”

Section: Csasupporting

confidence: 93%

Hydration and Carbonation of Alternative Binders

Kraft

Achenbach

Ludwig

et al. 2022

CMD

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The cement industry gains increasing public attention because of the high CO2 emissions for which it is accountable. One approach to improve the carbon footprint of cement production is the development of alternative binders, which can be produced with less energy consumption. These alternative binders have a reduced clinker to cement ratio or contain no Portland cement at all. For the corrosion protection of the reinforcement, the same requirements apply as for standardized types of cement. To perform this evaluation, a basic understanding is necessary of the products formed during hydration, the composition of the pore solutions and pore structure, and their influence on the resistance to carbonation. In this study, various alternative binders, such as novel types of composite cement with calcined clays or modified steel mill slag, alkali-activated materials, CA cement, and a C-S-H binder, are presented. The conducted investigations at mortars and cement pastes show the differences in hydration, microstructure development, and pH. The changes in microstructure and phase assemblage due to carbonation and the suitability of carbonation testing at an elevated CO2 content of 1 vol.-% for the different binders are also presented.

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Section: Csasupporting

confidence: 93%

Hydration and Carbonation of Alternative Binders

Kraft

Achenbach

Ludwig

et al. 2022

CMD

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“…However, these phases are only formed after a longer period of natural carbonation, because their characteristic peaks are observed only after 2 years of maturation. In the case of cement paste with w/c = 0.6, crystallization of monocarbonate C 3 A·CaCO 3 ·11H 2 O after 90 days of maturation was also observed, which may be the result of the progress of carbonation of both hydrated calcium aluminates [25] and sulphoaluminate phases [26]. In a longer period of time; i.e., after 2 years, this phase disappears.…”

Section: Results Of Tests On the Degree Of Hydration And Carbonationmentioning

confidence: 99%

“…All hardened paste ingredients are subject to carbonation irrespective of whether they have already undergone hydration or not. The most important carbonation processes of OPC cement hydration products occur according to Equations (1)–(2) [24,25,26,27]. However, owing to their volumetric proportions in the hardened paste, two of these ingredients play the most important roles from the point of view of changes in material porosity; these are CH (portlandite) and the C-S-H phase.…”

Section: Introductionmentioning

confidence: 99%

Effect of Hydration and Carbonation Progress on the Porosity and Permeability of Cement Pastes

Tracz

Zdeb

2019

Materials

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This paper presents the results of comprehensive cement paste porosity and gas permeability tests. The tests conducted concerned ordinary Portland cement (OPC) cement pastes with varying water-cement ratios ranging from 0.3 to 0.6. The tests were conducted after the curing of cement paste for 90 days and two years under laboratory conditions. Open porosity was determined using three methods: helium pycnometry, mercury intrusion porosimetry, and water saturation. Permeability was determined using a modified RILEM-Cembureau method. The results obtained demonstrated that permeability does not change significantly over time despite the observed material shifts in open porosity characteristics caused both by further progress in hydration and by the carbonation process that occurs. The results of the tests conducted also permitted the quantitative determination of the impact of the water-cement ratio, age, and the progress of carbonation on open porosity measured using different methods and also on the gas permeability of the pastes.

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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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A chemical/mineralogical investigation of the behavior of sulfoaluminate binders submitted to accelerated carbonation

Cited by 48 publications

References 28 publications

Hydration and Carbonation of Alternative Binders

Hydration and Carbonation of Alternative Binders

Effect of Hydration and Carbonation Progress on the Porosity and Permeability of Cement Pastes

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

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