Investigation on the formation of tobermorite in calcium silicate board and its influence factors under autoclaved curing

Chen, Mingxu; Lu, Lingchao; Wang, Shoude; Zhao, Piqi; Zhang, Wenlong; Zhang, Shuxin

doi:10.1016/j.conbuildmat.2017.03.143

Cited by 50 publications

(23 citation statements)

References 21 publications

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“…Original fibre cement technology involved the use of asbestos but has since been replaced with cellulose due to health and safety concerns with asbestos [34]. The ingredients in current fibre cement boards is similar to the ingredients found in boards often described as calcium silicate cement boards [35][36][37]. The gypsum plaster boards have layers of paper on either side of gypsum cement.…”

Section: Board Samplesmentioning

confidence: 99%

Physical and mechanical performance of magnesium-based construction boards: A comparative study

Aiken

McPolin

Russell

et al. 2021

Construction and Building Materials

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Section: Board Samplesmentioning

confidence: 99%

Physical and mechanical performance of magnesium-based construction boards: A comparative study

Aiken

McPolin

Russell

et al. 2021

Construction and Building Materials

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“…Tobermorites are crystalline calcium silicate hydrate minerals with an ideal Ca 5 Si 6 O 18 H 2 ·4H 2 O composition . Many studies have shown that tobermorite‐type calcium silicate exhibits several excellent characteristics such as light weight, flame retardant, and high compressive strength, which make it very efficient for heat insulation and fire‐resistant building material . Because of the high dehydration temperature and good thermal stability, calcium silicate thermal insulation material with tobermorite as the main component has been widely used in the fields of building materials or chemical industry .…”

Section: Introductionmentioning

confidence: 99%

Crystallization and phase transition of tobermorite synthesized by hydrothermal reaction from dicalcium silicate

Pan

et al. 2020

Int J Applied Ceramic Tech

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In this paper, tobermorite was hydrothermally synthesized from the dicalcium silicate (C 2 S) in sodium silicate solution, and the crystallization and phase transition process were investigated in detail using XRD, Raman spectra, and SEM. The tobermorite is difficult to synthesize when the temperature is lower than 160°C because it gets converted into xonotlite (without Na 2 O) or pectolite (with Na 2 O) when the temperature is higher than 180°C. The crystallization process of tobermorite shows "S" trend with the increase in time, which can be divided into three stages: the nucleation stage, rapid crystal growth stage, and perfect crystal forming stage. During the crystallization, 90% of the crystallization of tobermorite is completed in the stage of rapid crystal growth. Raman spectra and SEM analysis show that with the increase in hydrothermal time, the C 2 S of monomer (Q 0 ) is first converted into the calcium silicate hydrate of sheet (Q 2 and Q 3 ), and then continues to convert into tobermorite of chain (Q 2 ). K E Y W O R D Scalcium silicate, crystallization, hydrothermal, raman spectra, tobermorite

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“…During steam curing at atmospheric pressure, SiO 2 in QP is inactive and cannot react with Ca (OH) 2 formed during the hydration of the cement [15]. Under high temperature and high pressure, QP can react with cement hydration products to form tobermorite crystals [22], which prevents the formation of high crystallinity phases and reduces the content of Ca (OH) 2 crystals in the hydration products to improve the compressive strength of the concrete [23].…”

Section: Introductionmentioning

confidence: 99%

Effect of Mineral Admixtures on the Sulfate Resistance of High-Strength Piles Mortar

2020

Materials

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Pre-stressed high-strength concrete piles (PHCP) are widely used in the building industry in China. The main aim of our research was to investigate the utilization of quartz powder, fly ash, and blast furnace slag as mineral additives to prepare PHCP mortar. The samples were prepared using steam and autoclaving steaming. The influence of minerals on the sulfate resistance of mortar was analyzed using X-ray diffraction (XRD), scanning electron microscopy (SEM) and mercury intrusion porosimetry (MIP) tests. The results showed that when compared to single doped quartz powder samples, samples prepared using fly ash or blast furnace slag improved the sulfate resistance of the PHCP mortar. Furthermore, the resistance to sulfate attack of samples with dual doped quartz powder, fly ash, and blast furnace slag also improved. MIP tests showed that mineral additives can change the pore size distribution after autoclave curing. However, the number of aching holes increased after mixing with 20% quartz powder and caused a decrease in the sulfate resistance.

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Investigation on the formation of tobermorite in calcium silicate board and its influence factors under autoclaved curing

Cited by 50 publications

References 21 publications

Physical and mechanical performance of magnesium-based construction boards: A comparative study

Physical and mechanical performance of magnesium-based construction boards: A comparative study

Crystallization and phase transition of tobermorite synthesized by hydrothermal reaction from dicalcium silicate

Effect of Mineral Admixtures on the Sulfate Resistance of High-Strength Piles Mortar

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