THE HYDROTHERMAL SYNTHESIS OF 1.13 nm TOBERMORITE FROM GRANITE SAWING POWDER WASTE

Smalakys, G.

doi:10.13168/cs.2020.0013

Cited by 6 publications

(3 citation statements)

References 45 publications

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“…In recent years, many studies investigated the influence of different types of industrial waste on the synthesis and morphology of 1.1 nm tobermorite [ 56 , 57 , 58 , 59 ]. Depending on the starting materials used for the synthesis, 1.1 nm tobermorite crystals have crystal habits that range from whiskers or flakes [ 60 ] to laths [ 61 , 62 ], grass-like [ 10 ], tabular [ 58 ], fibers [ 63 ], plates [ 64 ], or needles [ 57 ]. The microstructure of the ACC with waste was denser than that of the reference sample.…”

Section: Resultsmentioning

confidence: 99%

Waste Originating from the Cleaning of Flue Gases from the Combustion of Industrial Wastes as a Lime Partial Replacement in Autoclaved Aerated Concrete

Różycka

Kotwica

2022

Materials

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This paper aims to study the suitability of partial replacement of lime by waste originating from the cleaning of flue gases from the combustion of industrial wastes in the production of autoclaved aerated concrete (AAC). The compressive strength, bulk density, pore structure, phase composition, and microstructure of hydration products of the AAC were analyzed. According to the results, the addition of the waste can effectively enhance the mechanical properties of AAC due to the differences in morphology of hydration product—1.1 nm tobermorite and related dense microstructure. The pore size distribution was significantly influenced by waste addition, which was one of the main reasons for the increase in thermal conductivity. The XRD and SEM results showed that foreign ions introduced with the wastes affect the synthesis of 1.1 nm tobermorite. Moreover, it was shown that waste containing a high content of CaO can be used as lime replacement, which allows reducing CO2 emissions during the AAC production process.

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Section: Resultsmentioning

confidence: 99%

Waste Originating from the Cleaning of Flue Gases from the Combustion of Industrial Wastes as a Lime Partial Replacement in Autoclaved Aerated Concrete

Różycka

Kotwica

2022

Materials

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“…23−29 Tobermorite synthesis has also been studied with additives like NaOH and Al 2 O 3 . 23,[25][26][27][28]30,31 NaOH has been shown to hinder the crystallization of tobermorite during synthesis by stabilizing the CSH gel formed. 28,32 Here crystallinity refers to the diffraction intensity observed, indicative of the ordering that the system has undergone.…”

Section: ■ Introductionmentioning

confidence: 99%

Coprecipitation of Crystalline Calcium Silicates and Carbonates from the Hydrothermal Reaction of Pseudowollastonite

Tolliver,

Nguyen,

Dela Cerna

et al. 2024

ACS Sustainable Chem. Eng.

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Calcium silicates are abundant but sparingly soluble feedstocks of interest for making low-carbon alternative cements. Under hydrothermal and alkaline conditions, they can form crystalline calcium silicate hydrate (CCSH) products, which are abundant in Roman concrete, or they can form carbonates when CO 2 is present. To understand when coprecipitation of CCSH and carbonate phases is possible, we studied the hydrothermal carbonation of a model calcium silicate, pseudowollastonite (α-CaSiO 3 ), at 150 °C and high pH as a function of CO 2 source [CO 2 (g) or Na 2 CO 3 ] and different concentrations of sodium, alumina, and silica. Our experiments produced a range of CCSH phases including tobermorite−13 Å, rhodesite, and pectolite, as early as 1 day after the start of our experiments. After 7 days of curing in a 2 M NaOH solution, over 10% of the samples had been converted to these CCSH phases. We also observed the formation of CaCO 3 as both aragonite and calcite when carbon was introduced to our experimental system. The carbon source impacted the ratio of the CaCO 3 to CCSH phases in the reaction products. The availability of Na 2 CO 3 produced a balance between the CaCO 3 and CCSH phases, whereas CO 2 (g) produced more CaCO 3 , with samples that were over one-third carbonate by mass. Higher concentrations of Na + increased the precipitation of both the CaCO 3 and CCSH phases. The presence of excess silica, in the form of dissolved borosilicate glass from our reaction vessels under alkaline reaction conditions, also enhanced the formation of CCSH phases formed in some experiments. Supplemental Al 2 O 3 , a common constituent in many silicate feedstocks, also enhanced CCSH formation, likely by forming aluminum-substituted phases under the conditions tested here. These chemical insights can enable the design of formulation and curing guidelines for novel cementitious materials.

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“…At the same time, the water molecules invading the silicate chain are also affected by the hydrophilicity and hydrophobicity of the silicate surface [4,5]. Smalkys G et al [6] synthesised C-S-H through experiments and found that there were two peaks, indicating that the C-S-H was composed of two phases: C-S-H (I) and C-S-H (II). Hou et al [7] simulated the migration of water molecules between the layers of the C-S-H by the molecular dynamics method, and studied the molecular structure, dynamic movement and the interaction between the water and the surface of the C-S-H.…”

Section: Introductionmentioning

confidence: 99%

Molecular Dynamics Analysis of Water Adsorption on Calcium Silicate Hydrate

Dong¹

2021

Ceramics - Silikaty

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THE HYDROTHERMAL SYNTHESIS OF 1.13 nm TOBERMORITE FROM GRANITE SAWING POWDER WASTE

Cited by 6 publications

References 45 publications

Waste Originating from the Cleaning of Flue Gases from the Combustion of Industrial Wastes as a Lime Partial Replacement in Autoclaved Aerated Concrete

Waste Originating from the Cleaning of Flue Gases from the Combustion of Industrial Wastes as a Lime Partial Replacement in Autoclaved Aerated Concrete

Coprecipitation of Crystalline Calcium Silicates and Carbonates from the Hydrothermal Reaction of Pseudowollastonite

Molecular Dynamics Analysis of Water Adsorption on Calcium Silicate Hydrate

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