残余碳对掺萘系减水剂水泥浆体流变性的影响

Effect of Remnant Carbon on Rheological Properties of Cement Paste with FDN Superplasticizer Added

以木炭模拟研究了残余碳对掺萘系减水剂水泥浆体流变性的影响,测试了水泥颗粒对萘系减水剂的吸附量以及浆体的流动度、Marsh时间、饱和掺量、表观黏度及剪切应力,同时观察了浆体絮凝情况.结果表明:随着残余碳含量的增加,萘系减水剂的表观吸附量逐渐增大;掺萘系减水剂水泥浆体的流动性随着残余碳含量的增加而下降,表现为浆体流动度下降、Marsh时间增大、饱和掺量增大、分散性下降、浆体絮凝结构数量及强度增大、剪切应力及表观黏度增大;浆体流动性与萘系减水剂的表观吸附量存在反向对应关系.

Through simulation of charcoal, the effect of remnant carbon on the rheological properties of cement paste added with FDN（polynaphthalene sulphonate） superplasticizer was studied. The effect of remnant carbon content on adsorption affinity of FDN superplasticizer for cement particles, and fluidity, Marsh time, saturation point, viscosity, and shear stress of the cement paste was investigated. The results suggest that remnant carbon really has adverse effect on the rheological properties. With increasing carbon content, flow property of cement paste shows a downtrend. With reduced fluidity, the Marsh time and saturation point increase, and the dispersibility of cement particles descends, the flocculation structure of cement paste is increased and strengthened. And the apparent adsorption amount of FDN superplasticizer on cement particles increases, shear stress and colloidal viscosity increase. The adsorption amount of FDN superplasticizer shows an inverse relation to fluidity of corresponding cement paste.