Effect of aspartic acid on the hydration process and setting performance of hemihydrate gypsum under alkaline conditions
This study employs Ca(OH)2 (CH) as an alkaline regulator to adjust the pH of β-hemihydrate gypsum (β-HH), and l-aspartic acid (LA) as a retarder. The effects of LA on the hydration performance of β-HH under different alkaline conditions were investigated. Results indicate that at pH 6.82, with 0.5 %...
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Elsevier
2025-05-01
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| Series: | Journal of Materials Research and Technology |
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| Online Access: | http://www.sciencedirect.com/science/article/pii/S2238785425013171 |
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| author | Yi Hui Jiacan Lin Yi Ding Qifang Ren Ranran Chen |
| author_facet | Yi Hui Jiacan Lin Yi Ding Qifang Ren Ranran Chen |
| author_sort | Yi Hui |
| collection | DOAJ |
| description | This study employs Ca(OH)2 (CH) as an alkaline regulator to adjust the pH of β-hemihydrate gypsum (β-HH), and l-aspartic acid (LA) as a retarder. The effects of LA on the hydration performance of β-HH under different alkaline conditions were investigated. Results indicate that at pH 6.82, with 0.5 % LA added, the initial setting time of β-HH is 57 min and the final setting time is 110 min. At pH 11.03, with 0.5 % LA added, the initial setting time extends to 166 min and the final setting time to 450 min. Characterization techniques, including scanning electron microscopy (SEM), Fourier transform infrared spectroscopy (FTIR), X-ray diffraction (XRD), TAM-Air isothermal calorimetry, and thermogravimetric (TG) analysis, confirmed that in an alkaline environment, LA significantly inhibits the dissolution of β-HH, thereby suppressing the crystallization of dihydrate gypsum (DH). Additionally, molecular dynamics (MD) simulations revealed that LA selectively adsorbs onto the (1 2 0) surface of DH crystals. The adsorption mechanism involves electrostatic interactions between the charged functional groups of LA and calcium ions on the gypsum surface, as well as hydrogen bonding between the additional carboxyl and amino groups of LA and water molecules. |
| format | Article |
| id | doaj-art-db3d3c6f2aa348c39ceb617ee91d932f |
| institution | OA Journals |
| issn | 2238-7854 |
| language | English |
| publishDate | 2025-05-01 |
| publisher | Elsevier |
| record_format | Article |
| series | Journal of Materials Research and Technology |
| spelling | doaj-art-db3d3c6f2aa348c39ceb617ee91d932f2025-08-20T02:30:14ZengElsevierJournal of Materials Research and Technology2238-78542025-05-01369629964010.1016/j.jmrt.2025.05.161Effect of aspartic acid on the hydration process and setting performance of hemihydrate gypsum under alkaline conditionsYi Hui0Jiacan Lin1Yi Ding2Qifang Ren3Ranran Chen4Anhui Province Engineering Laboratory of Advanced Building Materials, Anhui Jianzhu University, Hefei, Anhui, 230601, China; Anhui Province Key Laboratory of Advanced Building Materials, Anhui Jianzhu University, Hefei, Anhui, 230601, ChinaAnhui Province Engineering Laboratory of Advanced Building Materials, Anhui Jianzhu University, Hefei, Anhui, 230601, China; Anhui Province Key Laboratory of Advanced Building Materials, Anhui Jianzhu University, Hefei, Anhui, 230601, ChinaAnhui Province Engineering Laboratory of Advanced Building Materials, Anhui Jianzhu University, Hefei, Anhui, 230601, China; Anhui Province Key Laboratory of Advanced Building Materials, Anhui Jianzhu University, Hefei, Anhui, 230601, China; Key Laboratory of Huizhou Architecture in Anhui Province, Anhui Jianzhu University, Hefei, Anhui, 230601, China; Corresponding author. Anhui Province Engineering Laboratory of Advanced Building Materials, Anhui Jianzhu University, Hefei, Anhui, 230601, China.Anhui Province Engineering Laboratory of Advanced Building Materials, Anhui Jianzhu University, Hefei, Anhui, 230601, China; Anhui Province Key Laboratory of Advanced Building Materials, Anhui Jianzhu University, Hefei, Anhui, 230601, China; Key Laboratory of Huizhou Architecture in Anhui Province, Anhui Jianzhu University, Hefei, Anhui, 230601, ChinaAnhui Province Engineering Laboratory of Advanced Building Materials, Anhui Jianzhu University, Hefei, Anhui, 230601, China; Anhui Province Key Laboratory of Advanced Building Materials, Anhui Jianzhu University, Hefei, Anhui, 230601, ChinaThis study employs Ca(OH)2 (CH) as an alkaline regulator to adjust the pH of β-hemihydrate gypsum (β-HH), and l-aspartic acid (LA) as a retarder. The effects of LA on the hydration performance of β-HH under different alkaline conditions were investigated. Results indicate that at pH 6.82, with 0.5 % LA added, the initial setting time of β-HH is 57 min and the final setting time is 110 min. At pH 11.03, with 0.5 % LA added, the initial setting time extends to 166 min and the final setting time to 450 min. Characterization techniques, including scanning electron microscopy (SEM), Fourier transform infrared spectroscopy (FTIR), X-ray diffraction (XRD), TAM-Air isothermal calorimetry, and thermogravimetric (TG) analysis, confirmed that in an alkaline environment, LA significantly inhibits the dissolution of β-HH, thereby suppressing the crystallization of dihydrate gypsum (DH). Additionally, molecular dynamics (MD) simulations revealed that LA selectively adsorbs onto the (1 2 0) surface of DH crystals. The adsorption mechanism involves electrostatic interactions between the charged functional groups of LA and calcium ions on the gypsum surface, as well as hydrogen bonding between the additional carboxyl and amino groups of LA and water molecules.http://www.sciencedirect.com/science/article/pii/S2238785425013171β-hemihydrate gypsumRetarderHydrationAdsorptionMicrostructure |
| spellingShingle | Yi Hui Jiacan Lin Yi Ding Qifang Ren Ranran Chen Effect of aspartic acid on the hydration process and setting performance of hemihydrate gypsum under alkaline conditions Journal of Materials Research and Technology β-hemihydrate gypsum Retarder Hydration Adsorption Microstructure |
| title | Effect of aspartic acid on the hydration process and setting performance of hemihydrate gypsum under alkaline conditions |
| title_full | Effect of aspartic acid on the hydration process and setting performance of hemihydrate gypsum under alkaline conditions |
| title_fullStr | Effect of aspartic acid on the hydration process and setting performance of hemihydrate gypsum under alkaline conditions |
| title_full_unstemmed | Effect of aspartic acid on the hydration process and setting performance of hemihydrate gypsum under alkaline conditions |
| title_short | Effect of aspartic acid on the hydration process and setting performance of hemihydrate gypsum under alkaline conditions |
| title_sort | effect of aspartic acid on the hydration process and setting performance of hemihydrate gypsum under alkaline conditions |
| topic | β-hemihydrate gypsum Retarder Hydration Adsorption Microstructure |
| url | http://www.sciencedirect.com/science/article/pii/S2238785425013171 |
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