Research on the proportion and performance of PVA-ECC expansion joint rapid repair material
FENG Chunyan
HUANG Xiaomin
CHEN Dongyu
XIA Haixin
Abstract：A rapid repair material for expansion joints(PVA-ECC)was prepared using fast hardening sulfoaluminate cement as the matrix,lithium carbonate and calcium formate as early strength agents,and PVA and BF fibers were added.The action mecha-nism of early strength agent and the influence of fiber content on the mechanical properties of the rapid repair material were ana-lyzed,and its economy was evaluated.The results showed that the optimal mix ratio for PVA-ECC was as follows:cement sand ra-tio of 1∶1.2,water cement ratio of 0.3,water reducing agent dosage of 0.5%,defoamer dosage of 0.2%,lithium carbonate dosage of 1.4%,and 6 mm PVA dosage of 1.5%.The PVA-ECC repair material saves 11.8%of the cost compared with the traditional mate-rial and shortens the maintenance time significantly.
Keywords：ECCexpansion joints quick repairearly strengthfibermechanical propertyeconomic analysis
Publication Date：2025-03-25
Online Publishing Date：2025-08-15(First online date of this platform, not the publication date of the document)
Pages：6( 6-10,26 )