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电阻率法研究减水剂与水泥的作用
作者:曾晓辉 隋同波 谢友均 李宗津 范磊  
单位:中南大学土木建筑学院 中国建筑材料科学研究总院 香港科技大学土木工程系  
关键词:减水剂  初始电阻率  流动度  吸附  溶解  最佳掺量 
分类号:TU528
出版年,卷(期):页码:2008,36(10):1390-1395
DOI:
摘要:

测定了掺β-萘磺酸甲醛聚合物减水剂(β-naphthalene sulfonate-formaldehyde condensate superplasticizer,FDN)和木质素磺酸钙减水剂(lignosulphonate superplasticizer,LS)水泥浆体的电阻率和流动度,以其第5min的电阻率为初始电阻率,并测定了其凝结时间。研究发现:FDN和LS对浆体电阻率影响不同,可用减水剂的吸附、溶解机理来解释浆体初始电阻率随FDN和LS掺量的变化。掺FDN水泥浆体的初始电阻率–掺量曲线可分为4个区:选择吸附区、有效吸附区、溶解电离区、电离饱和区,各区很好地反映了FDN的吸附与溶解特性。研究还发现掺LS浆体的最大初始电阻率与最大流动度对应的LS掺量相同,因此,电阻率法有望用于测定LS的最佳掺量。

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Electrical behavior of cement pastes with β-naphthalene sulfonate-formaldehyde condensate superplasticizer (FDN) and lignosulphonate superplasticizer (LS) as well as their relation to the fluidity of the pastes were investigated. The setting time tests of the pastes were also carried out. The resistivity at 5 min is regarded as initial resistivity. Results show that the FDN and the LS have different effects on the resistivity of cement pastes. The initial resistivity of the pastes changing with the amount of superplasticizer can be explained by the adsorption and the dissolution of superplasticizer. The curve of initial resistivity as a function of FDN dosage can be divided into 4 zones, which are the selective adsorption zone, the effective adsorption zone, the dissolution and ionization zone, and the saturated ionization zone, respectively. Each zone reflects the properties of FDN as a superplasticizer of cement paste. The LS dosage of the paste with the highest fluidity is the same as that of the highest initial resistivity. Electrical resistivity method will po-tentially be used to test the optimal dosage of LS.

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基金项目:
国家自然科学基金(50678174)资助项目。
作者简介:
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