Preparation by alkali excitation and properties of iron tailings foam concrete
In order to recycle and utilize iron tailings,raw materials including iron tailings,fly ash and slag were used to prepare foam concrete for partial substitution of cement by alkali-excited cementitious materials.The effects of alkali-excited cementitious materials(cement substitution rate),foam,water-binder ratio and polyvinyl alcohol on the compressive strength and thermal conductivity of foam concrete were analyzed,and the microstructure and reaction mechanism were investigated by SEM and XRD.The test results show that the maximum 28 d compressive strength is 4.99 MPa,the dry apparent density is 784 kg/m3,and the thermal conductivity is0.190 9 W/(m·K),when the content of alkali-excited cementitious material is 40%,the water-binder ratio is 0.40 and the polyvinyl alcohol is 1%,meeting the specification requirements.
iron tailingsfly ashalkali excitationfoam concretecompressive strengththermal insulation performancemicrostructure
万方数据
维普
