Repair techniques

We have studied the following repair techniques:
System I - reference mortar
The perimeter of the region to be repaired was cut with a cutting saw and the concrete removed to a depth of 2 cm below the steel. The corrosion products were cleaned with water and steel brush. The substrate was saturated with potable water, the forms put into place, and the region filled with well-vibrated mortar, and then the specimens were wet cured.
System II - polymer modified cement paste paint
The perimeter of the region to be repaired was cut with a cutting disc and the concrete removed to a depth of 2 cm below the steel. The corrosion products were cleaned with water and steel brush, and with a cloth wet in acetone. After 20 minutes, three layers of paint were applied with a paint brush with a 15 minutes interval between the application of each layer of paint. The components of the mixture were previously mixed manually for at least 3 minutes to obtain a homogeneous mixture. After the paint had dried up, the repair mortar was carefully applied. The forms were put into place, and the region filled with well-vibrated mortar, and then the specimens were wet cured.

System III - epoxy-based paint
The perimeter of the region to be repaired was cut with a cutting disc and the concrete removed to a depth of 2 cm below the steel. The corrosion products were clean with water and steel brush, and with a cloth wet in acetone. After 20 minutes, one layer of paint was applied with a paint brush. The repair mortar was carefully applied (after about 15 minutes) before the paint had dried up to guarantee adherence. The forms were put into place, and the region filled with well-vibrated mortar, and then the specimens were wet cured.
System IV - corrosion inhibitor admixture added to the mortar
The perimeter of the region to be repaired was cut with a cutting disc and the concrete removed to a depth of 2 cm below the steel. The corrosion products were cleaned with water and steel brush. The repair mortar was applied with the admixture in the following proportion: 4.5% of liquid admixture by mass of cement. The substrate was saturated with potable water, the forms put into place, and the region filled with this well-vibrated repair mortar, and then the specimens were wet cured.
System V - microsilica-based admixture added to the reference mortar
The perimeter of the region to be repaired was cut with a cutting disc and the concrete removed to a depth of 2 cm below the steel. The corrosion products were cleaned with water and steel brush. The substrate was saturated with potable water, the forms put into place, and the region filled with this well-vibrated repair mortar, and then the specimens were wet cured.