轻质隔热材料泡沫胶凝料浆的流变性能

Rheological Properties of Foam Cementitious Slurry for Light Thermal Insulation Materials

针对泡沫法制备的轻质隔热材料在成型时易出现泌水、塌模、分层等缺陷,利用高级流变仪系统地研究了泡沫胶凝料浆的流变性能,通过G′-t模式从流变学宏观参数(粘度、应力)和内部微弱结构异化(模量、应变)两方面分析了泡沫、胶凝材料和固体颗粒对泡沫胶凝料浆稳定性能的影响。研究发现,PT-10增稠剂对氧化铝料浆的作用明显。在一定范围内,固相含量越高,粘度越大,线性粘弹区越窄,流动性越差;剪切速率越大,发泡效果越好,料浆的稳定性越高,从而可获得稳定性较高的泡沫胶凝料浆。

Aiming at defects in the molding process such as bleeding,collapse,and delamination of lightweight thermal insulation materials prepared by the foam method,the rheological properties of the foam cementitious slurry were systematically studied using advanced rheometers.Using G′-t model the influence of foam,cementitious materials and solid particles on the stability of foam cementitious slurry were studied from such two aspects as rheological macroscopic parameters(viscosity,stress)and internal weak structural alienation(modulus,strain).The study found that PT-10 thickener had a significant effect on alumina slurry.Within a certain range,the higher the solid content,the greater the viscosity,the narrower the linear viscoelastic zone,and the worse the fluidity;the greater the shear rate,the better the foaming effect and the higher the stability of the slurry.Thus the highly stable foam cementitious slurry can be obtained.