Preparation of Novel Lignin Derivative and its Application in Cement and Concrete
Lignin-modified sulfonated acetone-formaldehyde resin (LSAF), a potentially useful superplasticizer, was synthesized by modifying sulfonated acetone-formaldehyde resin (SAF) with industrial byproduct EH-lignin, which is isolated from enzymatic hydrolyzed residue of cornstalks. The functional groups of LSAF resin were characterized by FT-IR analysis. The optimized synthesis conditions were presented and the reaction mechanisms as well as the chemical structure were discussed. Effect of LSAF on the properties of cement paste and concrete were tested to evaluate its overall performance. The results show that LSAF resin is effective to disperse cement particles and maintain cement paste fluidity continuously. Moreover, the slump retention of concrete at 60 min increases as the dosage of LSAF increases and the relative compressive strength of concrete with 1.5％ LSAF was improved considerably. It is proposed that LSAF resin is a kind of star-shape copolymer with lots of benzene sulfonate groups as short side chains and a few SAF resins as long branches, therefore the dispersion effect of LSAF resin can be ascribed to a combination effect of large steric hindrance and strong electrostatic repulsive force.
superplasticizer LSAF resin EH-lignin synthesis structure performance
Run Fang Jian Fu Rui Zou Xiansu Cheng
College of Material Science and Engineering, Fuzhou University, No.2 Xueyuan Road, Fuzhou 350108, Ch Department of Chemistry and Chemical Engineering, Minjiang University, No.1 Wenxian Road, Fuzhou 350 College of Material Science and Engineering, Fuzhou University, No.2 Xueyuan Road, Fuzhou 350108, Ch
国际会议
6th Asian Symposium on Polymers in Concrete(第六届亚洲聚合物混凝土国际会议)
上海
英文
431-439
2009-10-29（万方平台首次上网日期，不代表论文的发表时间）