Hot-Pressing Process and Water Resistance Properties of Desulphurization Gypsum Modified by Phenolic Resin
WU Qisheng
ZHU Zheyu
ZHU Huajun
GUANG Jianmiao
TANG Jin
Abstract：Mechanical property and water resistance properties of desulphurization gypsum were improved by phenolic resin using the hot pressing process.X-ray diffraction(XRD),thermo-gravimetric analyzer(DTA),scanning electron microscopy(SEM),Fourier transform infrared spectrometer(FTIR) and isothermal calorimeter were employed to study microstructure and hydration mechanism of composite.The results show that optimal parameter in hot-pressing process for flexural strength is 8 MPa,160 ℃ and 120 s,optimal parameter in hot-pressing process for compressive strength is 8 MPa,180 ℃ and 75 s;when content of phenolic resin,silane coupling agent and expansive agent are 1.0 ％,0.3 ％ and 3.0 ％ (by mass) respectively,water absorption (2 h) and water absorption(24 h) are 0.58％ and 1.07％ respectively.Phenolic resin play the role to fill pores and enhance dense ability and water resistance properties during the hydration process.
Keywords：desulphurization gypsumphenolic resinhot-pressing processmechanical propertywater resistance property
Publication Date：2017-01-01
Online Publishing Date：2025-08-15(First online date of this platform, not the publication date of the document)
Pages：6( 61-66 )