麦草木质素水泥混凝土减水剂研究

Development of A Concrete Water-Reducing Admixture Using Lignin from Alkaline Wheat Straw Pulping Black Liquor

将从麦草造纸黑液中提取的木质素进行磺化改性，探索其作为水泥混凝土减水剂的可行性。研制了ＺＳ－３号减水剂。同时对麦草造纸黑液资源化治理工艺中产生的含磺化木质素多糖液进行了水泥混凝土减水性能实验。研制了ＺＳ－２号减水剂。实验结果表明，ＺＳ－３使水泥混凝土减水率达１０％，７ｄ抗压强度增加１８％，２８ｄ抗压强度增加５％，达到水泥混凝土普通减水剂性能。ＺＳ－２使水泥混凝上减水率达１０％，７ｄ抗压强度增加７３％，２８ｄ抗压强度增加２６％，达到水泥混凝土高效减水剂性能。

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.