Development of an <i>in situ</i> X-ray diffraction system for hydrothermal reactions and its application to autoclaved aerated concrete formation

Kikuma, Jun; Tsunashima, M.; Ishikawa, Takehiko; Matsuno, Shunichi; Ogawa, Akihiro; Matsui, Kunihiko

doi:10.1154/1.3583565

Cited by 2 publications

(2 citation statements)

References 5 publications

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“…Tobermorite structure has significant effect on mechanical properties of AAC . Figure shows that tobermorite formation observed in both 10 and 12 bars steam pressure for two type of samples.…”

Section: Resultsmentioning

confidence: 88%

“…The obtained data were compared with the G2/350 products cured in the industrial autoclave at 12 bars steam pressure. Tobermorite structure has significant effect on mechanical properties of AAC [5]. Figure 4 shows that tobermorite formation observed in both 10 and 12 bars steam pressure for two type of samples.…”

Section: Verification Studies Of Aac Products Cured At 10 Bars Steam mentioning

confidence: 96%

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Effects of different autoclaving pressure on mechanical properties of AAC

Yazal¹,

Kavas

Soyal³

2018

ce papers

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Autoclaved aerated concrete (AAC) blocks are widely used as a walling material in construction sector in Turkey. They are produced from the mixture of chemically suitable raw materials with water. Prepared slurry is poured into the metallic molds and left to expand and for hardening process in curing area. Thereafter, expended mud, called a cake, is sent to the autoclave stage.This stage is one of the most important process involved in the crystalline structure forming of AAC products. Furthermore, development of mechanical properties of AAC blocks is also strictly related to the conditions of those process. In this study, the effects of different autoclaving pressure and curing time on the mechanical properties of AAC products were investigated to increase production capacity and to save energy by optimizing these parameters. At the first stage, sized specimens were cured in autoclave under varied pressures between 5.5 and 12 bars at different period in a laboratory scale autoclave to determine optimum curing conditions for the samples of G2/350 and G2/400. Before using laboratory scale autoclave, the correlation coefficient between laboratory and industrial one was determined by producing samples from each group.According to the experimental results, the autoclaving process using 10 bars and 5.5 h could be recommended to obtain the best suitable products (for both crystalline structure and mechanical performance) for all groups of AAC blocks. The compressive strength of the specimens were 2.6 and 2.7 MPa for G2/350 and G2/400, respectively when compared with standard one (2.5 MPa) produced under 12 bars and 5.5 h. It is also concluded from this experimental study that the production pressure can be reduced from 12 to 10 bars although all the technical properties of experimental samples remain the same. K E Y W O R D SAAC, autoclaving process, crystalline structure, curing conditions, curing pressure

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Section: Resultsmentioning

confidence: 88%

Section: Verification Studies Of Aac Products Cured At 10 Bars Steam mentioning

confidence: 96%

Effects of different autoclaving pressure on mechanical properties of AAC

Yazal¹,

Kavas

Soyal³

2018

ce papers

View full text Add to dashboard Cite

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Recent studies of cements and concretes by synchrotron radiation crystallographic and cognate methods

Aranda

2015

Crystallography Reviews

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The portfolio of available synchrotron radiation techniques is increasing notably for cements and pastes. Furthermore, sometimes the terminology is confusing and an overall picture highlighting similarities and differences of related techniques was lacking. Therefore, the main objective of this work is to review recent advances in synchrotron techniques providing a comprehensive overview. This work is not intended to gather all publications in cement chemistry but to give a unified picture through selected examples. Crystallographic techniques are used for structure determination, quantitative phase analyses and microstructure characterization. These studies are not only carried out in standard conditions but synchrotron techniques are especially suited to non-ambient conditions: high temperatures and pressures, hydration, etc., and combinations. Related crystallographic techniques, like Pair Distribution Function, are being used for the analysis of ill-crystalline phase(s). Furthermore, crystallographic tools are also employed in imaging techniques including scanning diffraction microscopy and tomography and coherent diffraction imaging. Other synchrotron techniques are also reviewed including X-rays absorption spectroscopy for local structure and speciation characterizations; small angle X-ray scattering for microstructure analysis and several imaging techniques for microstructure quantification: full-field soft and hard X-ray nano-tomographies; scanning infrared spectro-microscopy; scanning transmission and fluorescence X-ray tomographies. Finally, a personal outlook is provided.

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Development of an in situ X-ray diffraction system for hydrothermal reactions and its application to autoclaved aerated concrete formation

Cited by 2 publications

References 5 publications

Effects of different autoclaving pressure on mechanical properties of AAC

Effects of different autoclaving pressure on mechanical properties of AAC

Recent studies of cements and concretes by synchrotron radiation crystallographic and cognate methods

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