摘要
以(NH4)2S2O8为引发剂,通过自由基溶液共聚反应,在木质素磺酸钙表面接枝丙烯酸、马来酸酐等单体,合成了接枝改性木质素磺酸盐减水剂。以净浆流动度为考察指标,通过正交试验确定最佳工艺条件:引发剂用量为0.2%,丙烯酸用量为10%,反应时间为2 h,反应温度为80℃;对于改性前后的起泡性进行了对比,研究了改性木质素磺酸盐减水剂对水泥净浆流动度、凝结时间和减水率的影响,并进行了对比试验。结果表明:改性后的起泡性有了明显的减弱,并有效缩短了凝结时间,具有较好的减水性能,减水率达20.85%。
Grafted calcium lignosulfonate superplasticizer（GCL） with crylic acid and maleic anhydride were synthesized by way of free radical solution copolymerization using（NH4）2S2O8 as initiator.The optimized reaction conditions（initiator amount 0.2%,content of acrylic acid 10%,reaction temperature 80℃,reaction time 2 h）were obtained via orthogonal test.The foaming ability of the superplasticizer after modification was compared with it before modification,and the influence of the grafted calcium lignosulfonate superplasticizer on the fluidity,consolidating time,and water reducing rate of net cement slurry was studied and a comparative experiment was carried out.The results show that the foaming ability of the superplasticizer after modification were markedly reduced,and the setting time of cement were shortened,the grafted calcium lignosulfonate superplasticizer has a better water-reducing performance as effectively as high grade concrete water reducing agent,water-reducing ratio reached 20.85%.
出处
《四川建筑科学研究》
北大核心
2010年第4期208-211,共4页
Sichuan Building Science
基金
四川省科技攻关计划项目(06ZSZ102)
四川省先进建筑材料重点实验室(08ZXXK03)
关键词
木质素磺酸盐
接枝共聚
减水剂
lignosulfonate
graft copolymerization
water-reducing agent
