Effect and mechanism of high Li2CO3 concentrations on the early hydration of sulfoaluminate cement-based materials

Li, Haiyan; Zheng, Zhilong; Guan, Xiaohong; Zou, Dinghua

doi:10.1016/j.jmrt.2023.06.208

Cited by 11 publications

(2 citation statements)

References 28 publications

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“…Chemical reagents used in this study, such as (Al(NO 3 ) 3 ·9H 2 O), 30% NH 3 ·H 2 O, NaOH, NaHCO 3 , CaSO 4 , and CaO, were of analytical grade. PCE was purchased with a number average molecular weight ( M n ) of 67,500 g/mol and heavy average molecular weight ( M w ) of 32,300 g/mol, which was obtained using a combination of gel-permeation and size-exclusion chromatography techniques …”

Section: Methodsmentioning

confidence: 99%

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Effect of AH₃-PCE Ultrafine Composites on the Properties of Sulfoaluminate Cement-Based Materials

Li,

Hu,

et al. 2023

ACS Appl. Nano Mater.

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The use of superfine particles has been found to be a promising method for accelerating cement hydration. Amorphous aluminum hydroxide (AH3) is a key hydration product in sulfoaluminate cements and our preliminary research work indicated that the ultrafine amorphous AH3 accelerates the hydration rate of sulfoaluminate cement-based grouting materials (SAGMs). However, the ultrafine AH3 tends to agglomerate easily, which affects its effectiveness. In this study, aluminum hydroxide-polycarboxylic acid superplasticizer (AH3-PCE) ultrafine composites were prepared using the sol–gel method, and their effect on the hydration and hardening process of SAGMs was investigated. The results showed that the particle size of the AH3-PCE ultrafine composites decreased and then increased with increasing amount of PCE and there was a strong interaction of AH3 with PCE through the oxygen atoms of C–O–C. AH3-PCE ultrafine composites provided nucleation for the growth of bayerite and ettringite (AFt). Moreover, the AH3-PCE ultrafine composites released aluminum ions and PCE in an alkaline solution at pH 12.5. The AH3-PCE ultrafine composites promoted cement hydration, adjusted the pore structure of the hardened paste, and improved the compressive strength at all ages owing to the synergistic effect of nucleation, aluminum ions, and PCE released from the AH3-PCE ultrafine composite.

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Section: Methodsmentioning

confidence: 99%

“…PCE was purchased with a number average molecular weight (M n ) of 67,500 g/mol and heavy average molecular weight (M w ) of 32,300 g/mol, which was obtained using a combination of gelpermeation and size-exclusion chromatography techniques. 30 2.2. Synthesis of the AH 3 -PCE Ultrafine Composites.…”

Section: Introductionmentioning

confidence: 99%

Effect of AH₃-PCE Ultrafine Composites on the Properties of Sulfoaluminate Cement-Based Materials

Li,

Hu,

et al. 2023

ACS Appl. Nano Mater.

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Role of the structure of synthetic Al(OH)3 on the properties of sulfoaluminate cement-based materials

Li,

Liu,

et al. 2023

Cement and Concrete Research

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Effect of composite retarder on early properties of C12A7-CaSO4-cement composite materials

Wang,

Zhang,

Liu

et al. 2024

Construction and Building Materials

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Effect and mechanism of high Li2CO3 concentrations on the early hydration of sulfoaluminate cement-based materials

Cited by 11 publications

References 28 publications

Effect of AH₃-PCE Ultrafine Composites on the Properties of Sulfoaluminate Cement-Based Materials

Effect of AH₃-PCE Ultrafine Composites on the Properties of Sulfoaluminate Cement-Based Materials

Role of the structure of synthetic Al(OH)3 on the properties of sulfoaluminate cement-based materials

Effect of composite retarder on early properties of C12A7-CaSO4-cement composite materials

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Effect and mechanism of high Li2CO3 concentrations on the early hydration of sulfoaluminate cement-based materials

Cited by 11 publications

References 28 publications

Effect of AH3-PCE Ultrafine Composites on the Properties of Sulfoaluminate Cement-Based Materials

Effect of AH3-PCE Ultrafine Composites on the Properties of Sulfoaluminate Cement-Based Materials

Role of the structure of synthetic Al(OH)3 on the properties of sulfoaluminate cement-based materials

Effect of composite retarder on early properties of C12A7-CaSO4-cement composite materials

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Product

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Effect of AH₃-PCE Ultrafine Composites on the Properties of Sulfoaluminate Cement-Based Materials

Effect of AH₃-PCE Ultrafine Composites on the Properties of Sulfoaluminate Cement-Based Materials