Influence of calcium and magnesium carbonates on hydration kinetics, hydrate assemblage and microstructural development of metakaolin containing composite cements

Zając, Maciej; Durdzinski, Pawel; Stabler, Christopher; Skoček, Jan; Nied, Dominik; Haha, Mohsen Ben

doi:10.1016/j.cemconres.2018.01.008

Cited by 86 publications

(39 citation statements)

References 49 publications

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“…The same effects can be seen when dolomitic limestone is used, since these materials contain reactive calcite [47], and dolomite has been shown to be unreactive at room temperature [48]. Also worth considering is the composition of the cement blended with the limestone and calcined clay.…”

Section: Lc 3 Materialsmentioning

confidence: 79%

“…In a recent study [47] evaluating the phase assemblage evolution of calcium and magnesium carbonatemetakaolin-portland cements, it was identified that these carbonates have a comparable effect on hydration, as both minerals used in that study contained calcite. The amount of calcite present was sufficient to promote hemicarbonate formation, and significant differences in pore refinement and distribution of portlandite and silicates were observed in the carbonate-containing specimens, compared with reference samples containing quartz.…”

Section: Figurementioning

confidence: 96%

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Supplementary cementitious materials: New sources, characterization, and performance insights

Juenger

Snellings

Bernal

2019

Cement and Concrete Research

735

171

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Conventional supplementary cementitious materials (SCMs), such as blast furnace slags or fly ashes, have been used for many decades, and a large body of knowledge has been collected regarding their compositional make-up and their impacts on cement hydration and concrete properties. This accumulated empirical experience can provide a solid, confident base to go beyond the status quo and develop a new generation of low-clinker cements composed of new types and combinations of SCMs.The need for new sources of SCMs has never been greater, as supplies of traditional SCMs are becoming restricted, and the demand for SCMs to reduce CO2 emissions from concrete production is increasing. In this paper, recent research on emerging SCM sources is reviewed, along with new developments in characterizing and qualifying SCMs for use and improved knowledge of SCMs on long-term concrete performance and durability. Keywords(B) Characterization; (C) Durability; (D) Blended Cement; (D) Filler; (D) Pozzolan Material Chemistry Used as SCM (Mt/y)Total volume est. (Mt/y) Comments Blast furnace slag Ca-Si-Al 330 300-360 Nearly fully used, latent hydraulic Coal fly ash Si-Al 330-400 700-1100 Subject to limitations on carbon content, reactivity Natural pozzolans Si-Al 75 Large accessible reserves Large variety/variability, often high water demand Silica fume Si 0.5-1 1-2.5 Used in high-performance concrete Calcined clays Si-Al 3 Large accessible reserves Metakaolin performs best, often high water demand Limestone CaCO3 300 Large accessible reserves Cementitious contribution in combination with reactive aluminates Biomass ash Si 0 100-140 Competition with use as soil amendment, high water demand, (for some: high alkali contents) MSWI bottom ash Si-Al-Ca 0 30-60 Expansive and corrosive components, leaching issues Steel slag Ca-Si-Fe 0 (negligible) 170-250 Various types, can contain expansive components (CaO) or leachable heavy C L reactivity Copper slag Fe-Si 0 (some as filler) 30-40 Low reactivity, leaching of heavy metals, more research needed Other non-ferro slags Fe-(Si)-(Ca) 0 (some as filler) 5-15 Mt/y each (FeCr, Pb, Ni) Low reactivity, leaching of heavy metals, more research needed

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Section: Lc 3 Materialsmentioning

confidence: 79%

Section: Figurementioning

confidence: 96%

Supplementary cementitious materials: New sources, characterization, and performance insights

Juenger

Snellings

Bernal

2019

Cement and Concrete Research

735

171

View full text Add to dashboard Cite

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“…Supplementary cementitious materials (SCMs) and mineral fillers can be used to partially or fully replace Portland Cement (PC) in the binder fraction of concrete 1‐3 . Candidate SCMs, and mineral fillers used in such partial‐replacement applications include: ground granulated blast furnace slag (slag) 4,5 and dolomite ((Ca,Mg)CO 3 ) 6,7 amongst others. On the other hand, alkali activation of slags (AAS) offers a means to create alternate PC‐free cementation agents.…”

Section: Introductionmentioning

confidence: 99%

The effects of (di‐,tri‐valent)‐cation partitioning and intercalant anion‐type on the solubility of hydrotalcites

et al. 2020

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Synthetic hydrotalcites were produced by a co‐precipitation method. The hydrotalcites are represented by the general formula [MII(1‐x)MIII(x)(OH)2][An−]x/n·zH2O, where MII is a divalent cation (eg, Mg2+or Ca2+), MIII is a trivalent cation (eg, Al3+) and An− is the interlayer anion. Herein, MII = Mg, and MIII = Al such that [Mg/Al] = [2, 3] (atomic units) and An−, represents intercalant species including: OH−, SO42− and CO32− anions. The thermochemical data of each compound including their solubility constants (Kso), density and molar volume were quantified at T = 25 ± 0.5°C, and P = 1 bar. The solubilities of the synthetic hydrotalcites, irrespective of their divalent‐trivalent cation partitioning ratio, scaled as CO32− < SO42− < OH−; in order of decreasing solubility. The type of anion, very slightly, affected the solubility with less than ±1 log unit of variation for [Mg/Al] = 2, and ±2 log units of variation for [Mg/Al] = 3. The solubilities of these phases were strongly correlated with that of gibbsite (Al(OH)3); such that activity of the [AlO2−] species was solubility determining with increasing pH. The tabulated thermodynamic data were used to construct solid‐solution models for phases encompassing both cation distribution ratios and to calculate stable phase equilibria relevant to alkali‐activated slag (AAS) systems for diverse activator compositions.

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“…Magnesium carbonate hydrate, as an important magnesia inorganic chemical product, has been widely used in various industrial fields (e.g., filter material, pharmaceuticals, cosmetic manufacturing, rubber industry, lithographing inks, and as precursors for high-purity magnesium oxide [1,2]). Magnesium carbonate hydrate is a class of chemical compounds, and the general formula can be expressed as xMgCO 3 •yMg(OH) 2 •zH 2 O (x = 1-5, y = 0-1, z = 1-8).…”

Section: Introductionmentioning

confidence: 99%

Synthesis of magnesium carbonate hydrate from natural talc

et al. 2020

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Various morphologies of magnesium carbonate hydrate had been synthesized without using any organic additives by carefully adjusting the reaction temperature and time during the talc carbonation process. At lower temperatures, magnesium carbonate hydrate was prone to display needle-like morphology. With the further increase of the carbonation temperature, the sheet-like crystallites became the preferred morphology, and at higher aging temperatures, these crystallites tended to assemble into layer-like structures with diverse morphologies, such as rose-like particles and nest-like structure. The reaction time had no effect on the crystal morphology, but it affected the particle size and situation of the crystal growth. X-Ray diffraction results showed that these various morphologies were closely related to their crystal structure and compositions. The needle-like magnesium carbonate hydrate had a formula of MgCO3·3H2O, whereas with the morphological transformation from needle-like to sheet-like, rose-like, and nest-like structure, their corresponding compositions also changed from MgCO3·3H2O to 4MgCO3·Mg(OH)2·8H2O, 4MgCO3·Mg(OH)2·5H2O, and 4MgCO3·Mg(OH)2·4H2O.

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Influence of calcium and magnesium carbonates on hydration kinetics, hydrate assemblage and microstructural development of metakaolin containing composite cements

Cited by 86 publications

References 49 publications

Supplementary cementitious materials: New sources, characterization, and performance insights

Supplementary cementitious materials: New sources, characterization, and performance insights

The effects of (di‐,tri‐valent)‐cation partitioning and intercalant anion‐type on the solubility of hydrotalcites

Synthesis of magnesium carbonate hydrate from natural talc

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