摘要
目的探讨硫酸盐对聚羧酸减水剂分散效果的影响机理,改善硫酸盐对聚羧酸减水剂吸附性能的影响.方法在粉煤灰中掺入硫酸钠以改变其体系中硫酸盐的含量,然后在硫酸盐-聚羧酸体系中加入无机盐,采用总有机碳质量浓度(TOC)、ζ电位以及红外光谱等试验.结果当粉煤灰中硫酸钠质量分数为3%时,加入3%的硝酸钡以后,吸附完成时外加剂溶液中有机碳的质量浓度从898 mg/L增加到914 mg/L,ζ电位的绝对值由11.11 mV提高到14.6 mV;加入3%的氯化钙,吸附完成时外加剂溶液中有机碳的质量浓度从898 mg/L增加到1 141 mg/L,ζ电位的绝对值由11.11 mV提高到15.91 mV;同时当粉煤灰中硫酸钠质量分数为3%时,红外谱中透射率明显下降,但向体系中加入无机盐(3%硝酸钡或3%氯化钙)以后,红外谱中百分比透射率有很大提高.结论硫酸钠与聚羧酸减水剂本身存在相互作用,粉煤灰中硫酸钠的含量越多对聚羧酸减水剂的吸附量增大,在硫酸盐-聚羧酸体系中加入无机盐,可以减弱硫酸盐对聚羧酸减水剂分散效果的影响.
The purpose of this paper is to explore the effect mechanism of sulfate salt on polycarboxylate superplasticizer dispersion and to improve the sulfate adsorption properties of polycarboxylate superplasticizer.Fly ash is incorporated into the predetermined mass ratio of sodium sulfate to change mass fraction of sulfate,then adding inorganic salts in the sulfate-polycarboxylate system through the total content of organic carbon（TOC）,ζ potential as well as infrared spectrum experiment.The results show that when the sulfate content in fly ash is 3%,add in 3% barium nitrate,organic carbon content of the admixture solution increased from 898 mg/L to 914 mg/L,zeta potential absolute value was increased from 11.11 mV to 14.6 mV;add in 3% calcium chloride additive solution,organic carbon content increased from 898 mg/L to 1 141 mg/L,zeta potential absolute value was increased from 11.11 mV to15.91 mV;At the same time when the sulfate content in fly ash is 3%,the percentage of transmittance in the infrared spectrum decreased,but inorganic salt（3% barium nitrate or 3% calcium chloride）is added to the system,the percentage transmittance in the IR greatly improved.The conclusion is that inherent interaction is existed between sodium and polycarboxylate superplasticizer.The higher the sodium mass fraction in fly ash,the greater the amount adsorption of polycarboxylate superplasticizer adsorption,and join in orgainic salt in the system of Sulfate and polycarboxylate can weaken the impact of sulfate on the adsorption properties of polycarboxylate superplasticizer.
出处
《沈阳建筑大学学报（自然科学版）》
CAS
北大核心
2013年第4期687-692,697,共7页
Journal of Shenyang Jianzhu University：Natural Science
基金
国家自然科学基金项目(51174015)
关键词
硫酸盐
聚羧酸减水剂
吸附
红外光谱
sulfate
polycarboxylate superplasticizer
adsorption
infrared absorption
