含木质素基混凝土外加剂的研究进展

摘要

综述了木质素在混凝土外加剂中的应用。工业木质素，尤其是木质素磺酸盐，可以充当混凝土减水剂、缓凝剂、引气剂和泵送剂。由于未经改性的工业木质素性能不够理想，为了提高木质素基混凝土添加剂的性能，宜对其进行适当的改性。碱木质素经过氧化、磺化、磺甲基化、接枝共聚等改性后，可以得到具有良好性能的混凝土外加剂。%The applications of lignin derivatives in concrete admixtures are reviewed. Technical lignins, especially lignosulfonates, can serve as concrete water reducers, retarders, air entraining agents and pumping agents. The performance of lignin is not good. Some appropriate modifications are sometimes required in order to improve the performance of the lignin-based concrete admixtures. Lignin-based concrete admixtures with good performaces can be obtained fxom alkali lignin after modifications such as oxidation, sulfonation, sulfomethylation and graft copolymerization.