The effect of boron oxide on the microstructure and hydration of calcium sulfoaluminate phase

Boron-rich waste causes numerous environmental problems when discharged directly into the environment. Here, various quantities of boron oxide (B 2 O 3 ) were added to calcium sulfoaluminate (C 4 A 3 $) during the sintering process to demonstrate a potential use of boron-rich waste. The microstructu...

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Bibliographic Details
Published in:Materials research express 2023-07, Vol.10 (7), p.75502
Main Authors: Ma, Qinchuan, Song, Fei, Lyu, Yinong, Li, Geng, Peng, Meixun, Zhao, Hongwei
Format: Article
Language:English
Subjects:
Boron
boron oxide
Boron oxides
Calcium
calcium sulfoaluminate
Compressive strength
Grain size
Hydration
Microstructure
Pastes
Phase transitions
Sintering
Substitution reactions
Tetrahedra
waste management
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Summary:Boron-rich waste causes numerous environmental problems when discharged directly into the environment. Here, various quantities of boron oxide (B 2 O 3 ) were added to calcium sulfoaluminate (C 4 A 3 $) during the sintering process to demonstrate a potential use of boron-rich waste. The microstructure and hydration performance of C 4 A 3 $ with various B 2 O 3 contents were investigated with scanning electron microscopy, x-ray diffraction, isothermal conduction calorimetry, thermogravimetric studies and compressive strength tests. B 2 O 3 -doped C 4 A 3 $ had a larger grain size than the pure phase; and were surrounded by amorphous phases. The presence of B 2 O 3 was shown to promote the phase transition process through which C 4 A 3 $ changes from the orthorhombic to the cubic structure; and the substitution of Al 3+ for B 3+ in AlO 4 tetrahedra was surveyed by structural refinements. As the B 2 O 3 content increased, the induction period of C 4 A 3 $ increased while the hydration rate decreased because of the amorphous phases around the C 4 A 3 $. However, the hydration degree of doped C 4 A 3 $ increased due to the slower reaction rate. Thus, when an appropriate amount of B 2 O 3 was added to the C 4 A 3 $ during sintering, a significant improvement in the compressive strength of pastes was observed.
ISSN:2053-1591
2053-1591
DOI:10.1088/2053-1591/ace30c