Effect of in situ polymerization of AMPS-water absorptive resin modified NHL on the performance of sandstone crack grouting
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1.1aSchool of Materials Science and Engineering, Shaanxi University of Science and Technology, Xi’an710021, P. R. China;2.1bInstitute of Heritage Conservation Science and Technology, Shaanxi University of Science and Technology, Xi’an710021, P. R. China;3.1cShaanxi Key Laboratory of Green Preparation and Functionalization of Inorganic Materials, Shaanxi University of Science and Technology,, Xi’an710021, P. R. China;4.Yungang Research Institute, Datong, Shanxi037007, P. R. China;5.School of Cultural Heritage and Information Management, Shanghai University, Shanghai200444, P. R. China

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Supported by National Natural Science Foundation of China(52272020, 52102108), China Postdoctoral Science Foundation(2021M691997), and Key Scientific Research Program of Education Department of Shaanxi Provincial Government(22JY009,22JY010).

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    Abstract:

    Natural hydraulic lime (NHL) is a promising grouting material for stone heritage conservation, but is limited by low strength and high brittleness. 2-acrylamide-2-methylpropanesulfonic acid (AMPS) water-absorbing resin was used to modify NHL through one-step in situ polymerization, and the obtained AMPS/NHL composite material was characterized by XRD, FT-IR and SEM. Isothermal calorimeter was adopted to monitor the hydration heat releases of NHL before and after AMPS water-absorbing resin modification. The mechanical properties (flexural, compressive and bonding strength) of the cured slurry were tested using a universal testing machine. The results indicate that the acicular network structure generated by AMPS in NHL slurry can strengthen the internal connection of the slurry, improve the bonding effect, and significantly enhance the mechanical properties of the slurry. After curing for 28 days, the compressive strength of 3% AMPS modified slurry increased by 60.7 % to 5.37 MPa, with increase of 12.8 % and 32.5 % in bonding and bending strength, respectively.

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刘敏琪,柴玉梅,李允峰,闫宏斌,罗宏杰,朱建锋.原位聚合AMPS吸水树脂改性NHL对砂岩裂隙灌浆性能的影响[J].重庆大学学报,2024,47(10):172~180

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  • Received:January 18,2024
  • Online: November 14,2024
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