Abstract: The usages of bark lignosulfonate(LS) as concrete additive, surfactant and dispersant were studied. The results showed: bark LS had better performance than wood LS as additive in concrete, as surfactant and as dispersant, in which fluidity of cement paste using bark LS was 98.1% higher than that of wood LS, and drop of fluidity after 60min was only 5.6%;foaming capacity was 46.4% less than wood LS;surface tension at 1% was 48.1:mN/m;CMC and σ_CMC of bark LS were 0.245% and 54.5:mN/m, respectively. Meanwhile, compared with wood LS on chemical structure characteristics, bark LS had higher content of hydrophilic groups and relatively narrower M_rdistribution.

Key words: bark residue, lignosulfonate, residue of tannin extracts