D0:10.13374/.issn1001-053x.2013.07.002 第35卷第7期 北京科技大学学报 Vol.35 No.7 2013年7月 Journal of University of Science and Technology Beijing Jul.2013 高氧化铁粉煤灰影响聚羧酸减水剂吸附特性的机理 刘娟红☒，高霞，纪洪广 北京科技大学土木与环境工程学院，北京100083 ☒通信作者，E-mail:juanhongl966@hotmail.com 摘要采用净浆流动度、（电位、总有机碳(TOC)、红外光谱等实验，研究粉煤灰中氧化铁含量对不同结构聚羧酸减 水剂吸附性能的影响，探讨氧化铁影响聚羧酸减水剂对水泥分散性能的机理，并提出了相应改进方法.结果表明：粉煤 灰中氧化铁含量对参不同结构聚羧酸减水剂的水泥净浆流动度均有很大影响，当氧化铁质量为粉煤灰总质量的18%时 相应浆体基本失去流动性：加入硫化钠能使氧化铁与聚羧酸减水剂的吸附性能降低，浆体流动度有所改善.高氧化铁粉 煤灰对聚羧酸减水剂的吸附性很强，与普通Ⅱ级粉煤灰相比，外加剂溶液中有机碳的含量要减少1/3.电泳实验表明： 氧化铁的含量越多，体系（电位绝对值越小，分散稳定性越差.红外光谱表明：硫化钠的加入降低了高氧化铁粉煤灰对 聚羧酸减水剂的吸附. 关键词水泥：粉煤灰：氧化铁：聚羧酸酯：吸附 分类号TU528 Influence mechanism of high iron fly ash on the adsorption charac- teristics of polycarboxylate superplasticizers LIV Juan--homg☒，GA0Xia,JⅡHong-guang School of Civil and Environmental Engineering,University of Science and Technology Beijing,Beijing 100083,China Corresponding author,E-mail:juanhong1966@hotmail.com ABSTRACT The effect of iron oxide content in fly ash on the adsorption characteristics of polycarboxylate super- plasticizers with different structures was studied by the experiments of fluidity of paste,potential,total organic carbon (TOC)and infrared spectra.The influence mechanism of iron oxides on the cement dispersion properties of polycar- boxylate superplasticizers was discussed and the improved method was put forward.It is found that iron oxide content in fly ash has a significant impact on the fluidity of cement paste mixed with polycarboxylate superplasticizers.When iron oxides are 18%of the total fly ash by mass,the corresponding slurry fluidity will be nearly lost;adding sodium sulfide can reduce the adsorption characteristics of iron oxides onto polycarboxylate superplasticizers,and the slurry fluidity is improved.Compared with common fly ash,high iron oxide fly ash has stronger adsorption characteristics onto polycarboxylate superplasticizers,with organic carbon content in the additive solution decreasing by one-third. Electrophoresis experiments indicate that the more the iron oxide content,the smaller the absolute value of C potential and the poorer the dispersion stability.Infrared spectra show that the adding of sodium sulfide reduces the adsorption characteristics of high iron oxide fly ash onto polycarboxylate superplasticizers KEY WORDS cement;fly ash;iron oxides;polycarboxylate;adsorption 随着我国混凝土商品化步伐的加快，聚羧酸高减水剂因具有优异的减水分散性能而成为高强和高 性能减水剂在最近几年得到了快速发展.聚羧酸盐 流动性混凝土中外加剂的重要组分，并且在较低用 收稿日期：2012-04-20 基金项目：因家自然科学基金资助项目(51174015)第 35 卷 第 7 期 北 京 科 技 大 学 学 报 Vol. 35 No. 7 2013 年 7 月 Journal of University of Science and Technology Beijing Jul. 2013 高氧化铁粉煤灰影响聚羧酸减水剂吸附特性的机理 刘娟红 ，高 霞，纪洪广 北京科技大学土木与环境工程学院，北京 100083 通信作者，E-mail: juanhong1966@hotmail.com 摘 要 采用净浆流动度、ζ 电位、总有机碳 (TOC)、红外光谱等实验，研究粉煤灰中氧化铁含量对不同结构聚羧酸减 水剂吸附性能的影响，探讨氧化铁影响聚羧酸减水剂对水泥分散性能的机理，并提出了相应改进方法. 结果表明：粉煤 灰中氧化铁含量对掺不同结构聚羧酸减水剂的水泥净浆流动度均有很大影响，当氧化铁质量为粉煤灰总质量的 18%时 相应浆体基本失去流动性；加入硫化钠能使氧化铁与聚羧酸减水剂的吸附性能降低，浆体流动度有所改善. 高氧化铁粉 煤灰对聚羧酸减水剂的吸附性很强，与普通Ⅱ级粉煤灰相比，外加剂溶液中有机碳的含量要减少 1/3. 电泳实验表明： 氧化铁的含量越多，体系 ζ 电位绝对值越小，分散稳定性越差. 红外光谱表明：硫化钠的加入降低了高氧化铁粉煤灰对 聚羧酸减水剂的吸附. 关键词 水泥；粉煤灰；氧化铁；聚羧酸酯；吸附 分类号 TU528 Influence mechanism of high iron fly ash on the adsorption charac￾teristics of polycarboxylate superplasticizers LIU Juan-hong , GAO Xia, JI Hong-guang School of Civil and Environmental Engineering, University of Science and Technology Beijing, Beijing 100083, China Corresponding author, E-mail: juanhong1966@hotmail.com ABSTRACT The effect of iron oxide content in fly ash on the adsorption characteristics of polycarboxylate super￾plasticizers with different structures was studied by the experiments of fluidity of paste, ζ potential, total organic carbon (TOC) and infrared spectra. The influence mechanism of iron oxides on the cement dispersion properties of polycar￾boxylate superplasticizers was discussed and the improved method was put forward. It is found that iron oxide content in fly ash has a significant impact on the fluidity of cement paste mixed with polycarboxylate superplasticizers. When iron oxides are 18% of the total fly ash by mass, the corresponding slurry fluidity will be nearly lost; adding sodium sulfide can reduce the adsorption characteristics of iron oxides onto polycarboxylate superplasticizers, and the slurry fluidity is improved. Compared with common fly ash, high iron oxide fly ash has stronger adsorption characteristics onto polycarboxylate superplasticizers, with organic carbon content in the additive solution decreasing by one-third. Electrophoresis experiments indicate that the more the iron oxide content, the smaller the absolute value of ζ potential and the poorer the dispersion stability. Infrared spectra show that the adding of sodium sulfide reduces the adsorption characteristics of high iron oxide fly ash onto polycarboxylate superplasticizers. KEY WORDS cement; fly ash; iron oxides; polycarboxylate; adsorption 随着我国混凝土商品化步伐的加快，聚羧酸高 性能减水剂在最近几年得到了快速发展. 聚羧酸盐 减水剂因具有优异的减水分散性能而成为高强和高 流动性混凝土中外加剂的重要组分，并且在较低用 收稿日期：2012–04–20 基金项目：国家自然科学基金资助项目 (51174015) DOI:10.13374/j.issn1001-053x.2013.07.002