木质素化学接枝对脂肪族高效减水剂性能的影响  

Effect of Lignin Chemical Grafting on Properties of Sulfated Acetone-formaldehyde Condensate Superplasticizer

作　　者：周芬 马双平 ZHOU Fen;MA Shuang-ping(Wuhan Subo New Building Materials Co,Ltd,Wuhan 430082,China;School of Materials Science and Engineering,Wuhan University of Technology,Wuhan 430070,China)

机构地区：[1]武汉苏博新型建材有限公司,武汉430082 [2]武汉理工大学材料科学与工程学院,武汉430070

出　　处：《建材世界》2025年第2期1-6,共6页The World of Building Materials

摘　　要：针对木质素化学接枝影响掺减水剂的混凝土强度问题,从水化动力学和孔结构演变等方面出发,探讨木质素接枝对脂肪族高效减水剂(磺化丙酮-甲醛缩聚物)性能的影响机制。结果表明,木质素接枝使脂肪族高效减水剂的吸附和分散性能下降,达到饱和掺量后,对水泥早期水化产物成核生长的抑制作用明显增强,水泥浆孔隙率和孔径增大,形成“低水化度-高孔隙率”的复合负面效应。In response to the effects of lignin chemical grafting on strength of concrete in corporating superplasticizers,the performance of lignin-grafted sulfonated acetone-formaldehyde condensate superplasticizer was examined,with a particular focus on hydration kinetics and the evolution of pore structure.Results indicate that lignin grafting diminishes the adsorption and dispersion capabilities of sulfonated acetone-formaldehyde condensate superplasticizer.Upon reaching the saturation dosage,the inhibitory effect on nucleation and growth of early cement hydration products is significantly enhanced,resulting in an increase in the porosity and pore size of the cement paste.The conclusion is that the impact of lignin grafting on the performance of superplasticizer is primarily due to the combined negative effects of"low hydration degree-high porosity".

关 键 词：木质素 减水剂 水泥水化 孔结构 

分 类 号：TU528.042[建筑科学—建筑技术科学]