Study on preparation and permeability of water-based epoxy resin grouting material
A water-based epoxy resin grouting material was prepared using waterborne epoxy resin E51 as the raw material and diethylenetriamine(DETA)as the curing agent.The effects of DETA dosage on the setting time,viscosity,mechanical strength,and permeability of the grouting material were studied.The results showed that with the increased of the mass fraction of curing agent DETA,the initial setting time of water-based epoxy resin grouting material gradually decreased,the viscosity continues to increased,the bonding strength first increased and then decreased,the thermal stability improved,the thermal weight loss rate slowed down,the residual carbon rate increased,and the penetration time increased.When the DETA mass fraction was 30％,the minimum initial setting time of the grouting material was 8.0 h,and the maximum viscosity at the corresponding time was 80 334 mPa·s.When the DETA mass fraction was 25％,the adhesive strength and compressive strength of the grouting material reached their maximum values,which were 2.94 and 59.9 MPa,respectively,with corresponding fracture elongation of 13.82％.At 800 ℃,the residual carbon rate of water-based epoxy resin grouting material with a DETA mass fraction of 25％was 9.3％,and the penetration time was 1 709 s.It had good thermal stability and penetration performance.Comprehensive analysis shows that the optimal mass fraction of DETA is 25％.
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