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In this paper, styrene-acrylic emulsion cement-based composite joint sealant is the research object, and the leveling test, the filling consistency test and the fixed extension test are carried out. The effect of the powder-liquid ratio (0.30, 0.35, 0.40, 0.45, 0.50, 0.55) on the working property and bonding property of the joint sealant is studied through indicators such as leveling, filling consistency, fixed elongation form and elastic recovery rate. Combined with the results of the mercury intrusion (MIP) test, the pore structure changes of joint sealant with different powder-liquid ratios are analyzed. The results show that the leveling property of joint sealant is not affected by changes in the powder-liquid ratio, and all have good leveling property. With the increase of powder-liquid ratio, the filling consistency of the joint sealant continues to increase, the bonding property gradually deteriorates, and the elastic recovery rate generally shows a downward trend. Comprehensive comparison of the working property and bonding property of different powder-liquid ratio joint sealant, the best powder-liquid ratio range of joint sealant is 0.35~0.40. With the increase of powder-liquid ratio, the pore volume of the joint sealant decreases, the pore size is refined, and the pore size distribution is optimized.
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