In order to obtain construction structural adhesives with well-balanced overall performance, the addition of appropriate amounts of additives is crucial. E-51 was employedas the epoxy matrix and a blended curing agent consisting of 201 and 650 at a mass ratio of 7∶3. The effects of reactive diluent, toughening agent, and coupling agent dosage on the mechanical properties, gel time, and toughness of epoxy-based construction structural adhesives were systematically investigated. Structural and performance characterization was performed using SEM and IR techniques. Results revealed that increasing the diluent content significantly reduced viscosity, prolonged gel time, and enhanced flowability. Tensile shear strength, flexural strength, and impact strength exhibited an initial increase followed by a decrease, whereas tensile strength and compressive strength demonstrated a declining trend. Increasing the toughening agent and coupling agent content revealed a consistent rise-fall pattern in mechanical strengths.
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