Synthesis and Characterisation of Hemihydrate Gypsum–Polyacrylamide Composite: A Novel Inorganic/Organic Cementitious Material - Aix-Marseille Université Accéder directement au contenu
Article Dans Une Revue Materials Année : 2024

Synthesis and Characterisation of Hemihydrate Gypsum–Polyacrylamide Composite: A Novel Inorganic/Organic Cementitious Material

Yuan Chen
Zerui Mi
  • Fonction : Auteur
  • PersonId : 1369642
Jiatong Yang
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  • PersonId : 1369643
Xuan Zheng
  • Fonction : Auteur
Huihu Wang
  • Fonction : Auteur
  • PersonId : 1369644
Juan Wang
Jan-Michael Albina
Yiwan Huang

Résumé

This study combined inorganic α-hemihydrate gypsum (α-HHG) with organic polyacrylamide (PAM) hydrogel to create a novel α-HHG/PAM composite material. Through this facile composite strategy, this fabricated material exhibited a significantly longer initial setting time and higher mechanical strength compared to α-HHG. The effects of the addition amount and the concentration of PAM precursor solution on the flowability of the α-HHG/PAM composite material slurry, initial setting time, and mechanical properties of the hardened specimens were investigated. The structural characteristics of the composite material were examined using XRD, FE-SEM, and TGA. The results showed that the initial setting time of the α-HHG/PAM composite material was 25.7 min, which is an extension of 127.43% compared to that of α-HHG. The flexural strength and compressive strength of the oven-dried specimens were 23.4 MPa and 58.6 MPa, respectively, representing increases of 34.73% and 84.86% over values for α-HHG. The XRD, FE-SEM, and TGA results all indicated that the hydration of α-HHG in the composite material was incomplete. The incompleteness is caused by the competition between the hydration process of inorganic α-HHG and the gelation process of the acrylamide molecules for water, which hinders some α-HHG from entirely reacting with water. The enhanced mechanical strength of the α-HHG/PAM composite material results from the tight interweaving and integrating of organic and inorganic networks. This study provides a concise and efficient approach to the modification research of hemihydrate gypsum.
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Dates et versions

hal-04527116 , version 1 (29-03-2024)

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Yuan Chen, Zerui Mi, Jiatong Yang, Xuan Zheng, Huihu Wang, et al.. Synthesis and Characterisation of Hemihydrate Gypsum–Polyacrylamide Composite: A Novel Inorganic/Organic Cementitious Material. Materials, 2024, 17 (7), pp.1510. ⟨10.3390/ma17071510⟩. ⟨hal-04527116⟩
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