Effects and mechanism research of the crystalline state for the semi-crystalline calcium silicate

Tan, Wei; Zhu, Guorui; Liu, Ying; Zhang, Zhihao; Liu, Liyan

doi:10.1016/j.cemconres.2015.02.020

Cited by 11 publications

(3 citation statements)

References 24 publications

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“…As Al content increases, the typical plates of tobermorite break into regular patches and then into needle-like deposits that are covered on the surface of the laths until the needle-like shapes dominate [77]. Similar phenomena are also reported by other researchers [99,102]. It should be noted that some studies present conflicting data on morphology which may be due to the interference of other ions such as Na + [103] and SO4 2- [99].…”

Section: Influence Of Aluminium On the Properties Of Tobermoritesupporting

confidence: 78%

Influence of foreign ions on calcium silicate hydrate under hydrothermal conditions: A review

Tian

Stephan

Lothenbach

et al. 2021

Construction and Building Materials

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Section: Influence Of Aluminium On the Properties Of Tobermoritesupporting

confidence: 78%

Influence of foreign ions on calcium silicate hydrate under hydrothermal conditions: A review

Tian

Stephan

Lothenbach

et al. 2021

Construction and Building Materials

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“…Tan et al observed that the lath-like crystalline C–S–H were thinner and longer as aluminum addition increased, until they finally changed into needles. 51 Maeda et al also found that tobermorite showed fiber-like and plate-like morphologies in the aluminum-incorporated CaO–SiO 2 –H 2 O system. 52 …”

Section: Resultsmentioning

confidence: 94%

Microstructure and characterization of aluminum-incorporated calcium silicate hydrates (C–S–H) under hydrothermal conditions

Zhao

2018

RSC Adv.

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The phase assembly and microstructure of the aluminum-incorporated CaO-SiO 2 -H 2 O system, which is technologically important in autoclaved building materials, catalysis and waste management, were investigated using XRD, SEM, FTIR and NMR depending on aluminum addition, reaction temperature and curing time. The content of each phase was obtained using the MAUD program based on the Rietveld refinement. The results revealed that the formation of the tobermorite phase was promoted at Al/(Al + Si) # 0.03, and subsequently retarded by higher aluminum addition, which was corroborated by the presence of more low polymerized and cross-linked (alumino)silicate chains. The phase purity decreased with increasing aluminum addition. Aluminum changed the morphology of tobermorite from plate-like to lath-like and fibrous. About a quarter of the (alumino)silicate chains in the C-S-H structure were linked though a^Si-O-Al^configuration, and this proportion was almost independent of aluminum addition. Furthermore, only Al[4] substituted for silicon in the aluminum incorporated C-S-H, while Al [6] just exited in the hydrogarnet phase. This work is beneficial for understanding the implication on microproperties of by-products or admixtures containing aluminum in concrete.

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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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Effects and mechanism research of the crystalline state for the semi-crystalline calcium silicate

Cited by 11 publications

References 24 publications

Influence of foreign ions on calcium silicate hydrate under hydrothermal conditions: A review

Influence of foreign ions on calcium silicate hydrate under hydrothermal conditions: A review

Microstructure and characterization of aluminum-incorporated calcium silicate hydrates (C–S–H) under hydrothermal conditions

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

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