The effect of polyacrylamide in concrete, PAM flocculant on cement concrete bridge deck pavement layer, can improve the flexural strength, bonding strength, bending toughness and wear resistance has a significant effect, and can reduce the compression and folding ratio, permeability and shrinkage. Anionic flocculants are generally recommended because of their high viscosity, low price and good water retention effect. We also can use in putty powder above do thickener, mortar ...