To address the problem of sulphate aluminum cement-based repair materials prone to cracking and to compensate for the strength deficiencies brought about by super absorbent polymers,polyvinyl alcohol fibers were introduced to optimize the polyvinyl alcohol fiber/SAP sulphate aluminum cement-based system with the help of response surface methodology.Then,based on the dry shrinkage and fracture energy experiments,the effect of the synergistic effect of the two materials on the crack resistance of the system was clarified after optimization.The results showed that the flexural strength of the system showed a trend of rising and then falling with the addition of polyethylene fiber,and the best enhancement effect was achieved when the fiber length was 12 mm,the dosage was 1.65％and the dispersant dosage was 0.22％.The shrinkage of the fiber and SAP group was reduced by 65.12％and the fracture energy was increased by 11.77 times compared with the conventional group,which proved that the synergistic effect of fiber and SAP had a positive effect on the performance of the repair material The synergistic effect of fiber and SAP was proved to have a positive effect on the performance improvement of the repair material.
维普
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