Research on the mechanical properties and hydration mechanism analysis of titanium gypsum based shield tunneling mortar
YANG He
CHEN Wei
Abstract：Titanium gypsum,desulfurization gypsum,and high titanium blast furnace slag are used as raw materials,and cement is added to produce titanium gypsum based shield tunneling mortar.The influences of cement content on the flexural and compressive strength,as well as water resistance coefficient of titanium gypsum based shield tunneling mortar were researched.Hydration mecha-nism of titanium gypsum based shield tunneling mortar was analyzed using XRD and SEM.The results show that when the cement content is 0～25％,the strength value of the titanium paste based shield tunneling mortar test block is positively correlated with cement content.The softening coefficient of titanium gypsum based shield tunneling mortar specimens exhibits a negative exponential function relationship with the cement content.When the cement content is 15％,the compressive strength of the titanium gypsum based shield tunnel mortar test block reaches the M10 grade of wet mixed mortar in GB/T25181-2019"Pre mixed Mortar".As the cement content increases,the hydration product calcium aluminate increases,the gaps between crystal structures decrease,the compactness of the tita-nium gypsum based shield tunneling mortar increases,and its strength and water resistance performance are improved.
Keywords：titanium gypsumhigh titanium blast furnace slagshield tunneling mortarstrengthwater resistance performance
Publication Date：2025-01-24
Online Publishing Date：2025-08-15(First online date of this platform, not the publication date of the document)