减水剂对干混砂浆中粉状组成分散性的对比试验研究  

Comparative experimental study on the dispersibility of water-reducing agents on powdered compositions in dry mixed mortar

作　　者：郑娟荣[1] 赵雪飞[1] 

机构地区：[1]郑州大学土木工程学院,河南郑州450002

出　　处：《混凝土》2014年第6期115-117,共3页Concrete

摘　　要：对减水剂对干混砂浆中粉状组成的分散性进行了对比试验研究,采用微坍落度筒测定了四种粉状组成(水泥、矿渣粉、粉煤灰和石灰石粉)的净浆流动度分别随4种减水剂(聚羧酸系、萘系、氨基系和脂肪族系)掺量增加的变化规律。试验结果表明:对于水泥、矿渣粉和粉煤灰,聚羧酸系减水剂是分散效果最好的减水剂;对于石灰石粉,脂肪族减水剂是分散效果最好的减水剂。由于脂肪族减水剂的单价约为聚羧酸系减水剂单价的1/4,结论是脂肪族减水剂将是制备干混砂浆的性价比最高的减水剂。Comparative experimental study on the dispersibility of water-reducing agents on powdered compositions in dry mixed mor-tar was carried on.Four types of powdered compositions （i.e.cement,slag powder,fly-ash and limestone powder） and four types of wa-ter-reducing agents （i.e.polycarboxylate,naphthalene formaldehyde,sulfamate and aliphatic water reducer ） were selected in this experi-mental study.The relationships between the paste fluidity of powdered composition and the content of water-reducing agent were measured by flow test.The results showed that the dispersion effect of polycarboxylate water reducer was best when the paste of cement or slag pow-der or fly-ash was dispersed by adding water-reducing agent ,and the dispersion effect of aliphatic water-reducer agent was best when the paste of limestone powder was dispersed by adding water-reducing agent ,and the unit price of aliphatic water-reducer agent is about quar-ter of the unit price of polycarboxylate water reducer.This is a conclusion that aliphatic water-reducer will be water-reducing agent with maximum ratio of performance and price in producing dry mixed mortar.

关 键 词：干混砂浆中粉状组成 减水剂 分散性 净浆流动度 

分 类 号：TU528.042.2[建筑科学—建筑技术科学]