加气混凝土料浆的流变性能及其与发气和稠化速率的关系  

Study on rheological property of AAC paste and relationship between gas-forming velocity and densification velocity

作　　者：闫加旺[1] 韦江雄[2,3] 庄梓豪[2,3] 余其俊[2,3] 

机构地区：[1]唐山学院,河北唐山063020 [2]华南理工大学材料科学与工程学院,广东广州510640 [3]华南理工大学特种功能材料教育部重点试验室,广东广州510640

出　　处：《混凝土》2009年第11期27-30,共4页Concrete

摘　　要：研究了粉煤灰和石灰对加气混凝土料浆流变性能、发气速率和稠化速率的影响,建立了加气混凝土料浆流变性能与发气速率和稠化速率之间的关系。结果表明:加气混凝土料浆为假塑性流体,可近似用宾汉姆流体来描述。随剪切速率的增大,料浆的剪切应力增大,黏度降低。随石灰掺量的增大,料浆的剪切应力和黏度均随之增大,而发气高度呈现先增大后减小的规律;随粉煤灰掺量的增加,料浆的剪切应力和黏度也随之增大,发气高度随之降低。黏度(Y)和稠化速率(X)关系式为:Y=-0.439-0.384X;黏度和发气速率(X1)的关系式为:Y=0.689-0.164X1。本试验条件下,当料浆的屈服值2Pa<f<4Pa和黏度0.2Pa·S<η<0.3Pa·S时,浆体的流动性能较好,也有利于铝粉的发气,生成的气泡均匀,能稳定地保存在料浆中。The effect of fly ash and lime on the theological property, rate of gas-forming and densification of autoclaved aerated concrete （AAC） paste was studied, then the relation between the rheological property and rate of gas-forming and densification of, AAC paste was established.The result shows that ACC paste is a pseudoplastic fluid, which can be approximately characterized by Binham fluid model.The shear stress of AAC paste is increased and the viscosity of AAC paste decreased with the increment of shear rate.With the addition of lime,the shear stress and viscosity of AAC paste is increased,the amount of formed gas is increased at first and then decreased.While with the addition of fly ash ,the shear stress and viscosity of AAC paste increased,but the amount of formed gas is decreased.The relational between viscosity （ Y ） and rate of densification （X） of AAC paste can＇be expressed as：velocity and is Y=-0.439-0.384X, and the relational between the viscosity and rate of gas-forming （X） is： Y=0.689-0.164X.According to this experiment, if the yield value of AAC paste （f） is controlled between 2 Pa and 4 Pa, and the viscosity between 0.2 Pa·S and 0.3 Pa·S, AAC paste is with good flowability, which is also of advantage to gas-forming, at the same time the gas bubble can be preserved in the paste uniformly and steadily.

关 键 词：加气混凝土 发气 稠化 屈服值 黏度 

分 类 号：TU528.2[建筑科学—建筑技术科学]