Development of A Concrete Water-Reducing Admixture Using Lignin from Alkaline Wheat Straw Pulping Black Liquor
麦草木质素水泥混凝土减水剂研究

Lignin extracted from an alkaline wheat straw pulping black liquor was modified by sulfonation to study the feasibility of its use as a concrete water reducing agent. This has resulted in the development of ZS-3 water-reducing admixture. In addition, a liquor containing sulfonated lignin and polysaccharides from the conversion process of wheat straw pulping black liquor was found to have a function of concrete water reduction and was turned into a superplasticizer ZS-2. Both ZS3 and ZS-2 had a water reduction by 10%. The compressive strength of concrete was increased by 18%(7 days) or 5 %(28 days) when ZS-3 was added, and by 73%(7 days) or 2% (28 days)when ZS-2 was added.