Influence of Acid Activator on Activation Effect of Solid Waste Materials
In order to investigate the effect of different types and concentrations of acid activators on the activation effect of solid waste,the controlled variable method was used.Three acid solutions were selected as activators to activate fly ash and slag.The activated fly ash and slag were mixed as cementitious materials to replace 30％(mass fraction)of cement.Two types of fine aggregates,all iron tailings sand and all recycled aggregates,were selected as grouting material specimens for testing.The experimental results show that the activity of solid waste materials stimulated by soaking in an appropriate concentration of acid activator is improved to varying degrees.Comparing the strength of the all iron tailings test group and the fully recycled fine aggregate test group,it is found that the acid activator has a better effect on improving the strength of the recycled aggregate test group.For the experimental group of the same type of fine aggregate,hydrochloric acid has a better effect on improving the strength of the specimens.When the types of acid solutions are the same,oxalic acid solution with a concentration of 1％(mass fraction),acetic acid solution with a concentration of 1％(mass fraction),and hydrochloric acid solution with a concentration of 2％(mass fraction)have a better improvement effect on the iron tailings test group.The experimental group of recycled aggregates with a concentration of 1％(mass fraction)oxalic acid solution,3％(mass fraction)acetic acid solution,and1.5％(mass fraction)hydrochloric acid solution show better improvement effects.Through X-ray diffraction(XRD)and scanning electron microscopy(SEM)analysis,it is found that the use of acid excited cementitious materials resulted in an increase in the relative content of quartz and ettringite in the specimens,indicating that acid excitation can promote the progress of hydration reactions.
acid excitationsolid wastecement based grouting materialiron tailings sandrecycled fine aggregatemechanical property
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