High-temperature phase transition and the activity of tobermorite

Yang, Xiuli; Cui, Chong; Cui, Xiaoyu; Tang, Guodong; Ma, Hailong

doi:10.1007/s11595-014-0911-x

Cited by 26 publications

(13 citation statements)

References 10 publications

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“…Near 860 °C temperature, tobermorite progresses into volostanite. This confirms the exothermic effect, which is not followed by a mass change [ 38 ]. In samples C20 and C30, near 920 °C–940 °C temperatures, a significant exothermic effect are noted when amorphous Al 2 O 3 moves into the γ-Al 2 O 3 form [ 26 ].…”

Section: Discussionsupporting

confidence: 75%

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Influence of Industrial Metakaolin Waste on Autoclaved Fiber Cement Properties Changes in Standard Fire Environment

et al. 2022

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An investigation was conducted on the influence that industrial metakaolin waste (IMW) has on the properties of autoclaved fiber cement composition (FCC) samples. FCC samples were made from fiber cement plate’s typical components using the same proportions. In samples, IMW was used instead of cement in 10%, 20%, 30% proportions and in 50%, 100% proportions instead of ground quartz. Differential thermal analysis (DTG), thermogravimetric analysis (TGA), ultrasound pulse velocity (UPV), density, porosity and optical microscope (OM) research methods were used to identify the micro and macrostructure of samples. Mechanical properties were evaluated using flexural and compressive strength research methods. It was established that IMW was used instead of cement in fiber cement composition samples up to 10% and in fiber cement composition samples instead of ground quartz forms density microstructure structure because of Al-rich tobermorite. As a result, the flexural and compressive strength increased. Samples with higher content of IMW instead of cement had unreacted IMW and a less dense microstructure. In this case, flexural and compressive strength decreased. All FCC samples were fired in a standard fire curve (ISO 842) for 30 min. Samples of mechanical properties were established by doing flexural and compressive strength tests, and which results showed the same trends.

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Section: Discussionsupporting

confidence: 75%

“…At higher temperatures, tobermorite hydroxyl group loss happens. In DTG research, it is determined that at 720–730 °C, when tobermorite loses its hydroxyl group and moves into a metastable state, dihydroxylation happens [ 38 ]. Near 860 °C temperature, tobermorite progresses into volostanite.…”

Section: Discussionmentioning

confidence: 99%

Influence of Industrial Metakaolin Waste on Autoclaved Fiber Cement Properties Changes in Standard Fire Environment

et al. 2022

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“…The loss of mass at a higher temperature, 750 °C, is due to the decomposition of CaCO 3 in a stable form of calcite. And the last one, at 800 ºC-1000 ºC, with the loss of hydroxyl groups in C-S-H gel [28]. These losses together with the losses due to ACC and the water adsorbed in the sample are shown in Table 1.…”

Section: Dta/tg/ms Characterizationmentioning

confidence: 94%

“…The TG curves for all the samples in Figure 3 exhibited a mass loss in four distinct temperature intervals. The first, between 25 ºC and 300 ºC, was associated with the loss of adsorbed water and the C-S-H gel itself [28,29]. Some authors [27,30], extend this interval up to 400ºC since they consider the presence of other phases as hydrated calcium sulphoaluminates; however, we consider only 300ºC, based on the work of loss of mass of samples of only hydrated calcium silicates [28]; the second one, at 300 ºC-430 ºC, with the loss of water from the amorphous calcium carbonate [26,31,32]; the third one, at 430 ºC-800 ºC, with the loss of CO 2 from calcium carbonate in different forms [33].…”

Section: Dta/tg/ms Characterizationmentioning

confidence: 99%

“…Thus, in the 300-430ºC range, the loss of water due to ACC decomposition and the loss of adsorbed CO 2 must be considered. This may justify the discrepancies in the literature regarding the mass loss range of C-S-H, in which some authors consider 300°C [28,29] and others consider 400°C [27,30] since adsorbed CO 2 is included in this interval. Therefore, the best way to quantify the different mass losses is to perform a TG/MS.…”

Section: Dta/tg/ms Characterizationmentioning

confidence: 99%

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CO2 adsorption on calcium silicate hydrate gel synthesized by double decomposition method

Martin-Garrido

Martínez-Ramírez

2020

J Therm Anal Calorim

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The calcium silicate hydrate gel (C-S-H) was synthesized by the double decomposition method because of the simplicity and the quickness of the procedure. The structure of the C-S-H gels after 1 week and 4 weeks in contact with the formation solution was studied through Micro-Raman, Fourier Transformed Infrared Spectroscopy and 29 Si Nuclear Magnetic Resonance. Simultaneous thermodifferential-thermogravimetric analysis and mass spectrometry (DTA/TG/MS) was used to identify the amount of calcium carbonate formed due to the reaction between the calcium and atmospheric CO 2. With DTA/TG/MS, mass loss due to CO 2 was observed to take place at temperatures below 400ºC, unidentified to date, which might be associated with the CO 2 adsorbed on the C-S-H gel. Thus, in the TG analysis in the 300-430ºC range, both the loss of water due to the decomposition of the amorphous calcium carbonate (ACC) and the loss of CO 2 adsorbed on the gel must be considered. Additionally, polymerization of the gel and a decrease in the Ca/Si ratio was observed from the samples from 1 to 4 weeks.

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The stability of formed CaF2 and its influence on the thermal behavior of C–S–H in CaO–silica gel waste-H2O system

Iljina

Baltakys

Bankauskaite

et al. 2016

J Therm Anal Calorim

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High-temperature phase transition and the activity of tobermorite

Cited by 26 publications

References 10 publications

Influence of Industrial Metakaolin Waste on Autoclaved Fiber Cement Properties Changes in Standard Fire Environment

Influence of Industrial Metakaolin Waste on Autoclaved Fiber Cement Properties Changes in Standard Fire Environment

CO2 adsorption on calcium silicate hydrate gel synthesized by double decomposition method

The stability of formed CaF2 and its influence on the thermal behavior of C–S–H in CaO–silica gel waste-H2O system

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