Effect of different types of additives on the interface transition zone of geopolymer rock interface
In order to study the impact of different types of additives on the interfacial transition zone(ITZ)of the geopolymer interface,this study employs a variable angle shear test to study the impact of the interface mechanical behavior of geopolymer materials.The Mohr-Coulomb criterion is used to char-acterize the friction angle and bonding strength within the interface.The microstructure of the fracture surface is analyzed by scanning electron microscopy and energy spectroscopy(SEM-EDS).The research results show that the internal friction angle at the interface between geopolymer and rock ranges between 38° and 48°.In the same set of control experiments,the internal friction angle at the interface is nega-tively correlated with the cohesion force.For the same type of rock,higher strength shows higher interfa-cial bonding strength.The three fiber materials have a positive impact on the bonding strength of the slag-geopolymer material and aggregate,among which the glass fiber reinforcement effect is the most significant,at 3.72 MPa.Among all test results,silica fume has the greatest enhancement effect on in-terfacial cohesion,which is 3.79 MPa.ITZ is the weakest zone in slag-geopolymer concrete.SEM-EDS test results show that the surface geopolymer-rock interface transition zone mainly exists in geopolymer materials,with the width of the interface transition zone between 10 and 20 μm.
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