Effect of gypsum dosage on the hydration and strength of alite-ye’elimite cement synthesized at 1300 °C

Wang, Qianqian; Ye, Zhiyuan; Hu, Yueyang; Wei, Shuaifei; Shen, Xiaodong

doi:10.1016/j.conbuildmat.2021.123063

Cited by 9 publications

(2 citation statements)

References 31 publications

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“…Many plate-like AFm and rod-like AFt were observed after curing C0 for 12 h (figure 11(b)). The precipitation of various hydration products after curing for 1 d yielded a dense mixture of various structures (figure 11(c)) [11,35,36]. Overall, C0 had a lower hydration degree because the reaction was too fast, and some minerals had not been able to react.…”

Section: Sem Analysis Of Pastesmentioning

confidence: 99%

“…The main hydrates of C 4 A 3 $ are monosulfate with variable water content (C 4 A$H 12 , AFm 12 ; C 4 A$H 14 , AFm 14 ), ettringite (C 6 A$ 3 H 32 , AFt), and amorphous aluminum hydroxide (AH 3 ) [30][31][32]. Gypsum both controls the hydration process of C 4 A 3 $ and changes the ratio of the main hydrates (AFt and AFm) [33][34][35]. Calcium hemicarboaluminate hydrate (C 4 AČ 0.5 H 12 , Hc), which belongs to the AFm family, forms when the calcite content of cement pastes is low or zero [36][37][38].…”

Section: Introductionmentioning

confidence: 99%

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

Song

Lyu

et al. 2023

Mater. Res. Express

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Boron-rich waste causes numerous environmental problems when discharged directly into the environment. Here, various quantities of boron oxide (B2O3) were added to calcium sulfoaluminate (C4A3$) during the sintering process to demonstrate a potential use of boron-rich waste. The microstructure and hydration performance of C4A3$ with various B2O3 contents were investigated with scanning electron microscopy, X-ray diffraction, isothermal conduction calorimetry, thermogravimetric studies and compressive strength tests. B2O3-doped C4A3$ had a larger grain size than the pure phase; and were surrounded by amorphous phases. The presence of B2O3 was shown to promote the phase transition process through which C4A3$ changes from the orthorhombic to the cubic structure; and the substitution of Al3+ for B3+ in AlO4 tetrahedra was surveyed by structural refinements. As the B2O3 content increased, the induction period of C4A3$ increased while the hydration rate decreased because of the amorphous phases around the C4A3$. However, the hydration degree of doped C4A3$ increased due to the slower reaction rate. Thus, when an appropriate amount of B2O3 was added to the C4A3$ during sintering, a significant improvement in the compressive strength of pastes was observed.

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Section: Sem Analysis Of Pastesmentioning

confidence: 99%