矿物掺合料复掺对水泥基材料流变性能的影响

摘要

The Marsh cone method,H tube method,micro slumps method and rheometer method are used to study the influence of double mixing of fly ash and mineral powder in polycarboxylic acid system on liquidity and rheological properties of cement slurry.Test results show that when the mineral admixture total substitution increased from 20％ to 40％,flow rate was increasing; while in total dosage fixed condition,with the fly ash content increased,the rheology was reducing;Rheological test results show that,when the total substitution is 30％,the slurry exhibits a linear Newtonian fluid properties,and when the replace content is 20％ and 40％,the slurry exhibits the characteristics of nonlinear pseudoplastic fluid.%采用Marsh筒法、H管法、微型坍落度法与流变仪法研究了在聚羧酸体系中复掺粉煤灰和矿粉2种矿物掺合料对水泥浆体流动性和流变性能的影响.试验结果表明:矿物掺合料的总取代量从20％增加到40％时,流动速度呈增大趋势;而在总掺量固定的条件下,随着粉煤灰掺量增加,流变性呈降低的趋势;流变试验结果表明,当总取代量为30％时,浆体表现出线性的牛顿流体特性,而总取代量为20％和40％时,浆体表现出非线性假塑性流体的特征.