料浆流动度对双氧水泡沫混凝土浆体稳定性的影响

Influence of slurry rheology on the stability of hydrogen peroxide foam concrete

以普通硅酸盐水泥为胶凝材料，使用粉煤灰替代部分水泥，利用化学发泡法制备泡沫混凝土，系统地研究了在不同料浆流动度条件下泡沫混凝土浆体稳定性及其力学性能。结果表明，料浆稳定膨胀的基本条件是：大量发泡阶段料浆极限剪应力值或塑性强度值应小，但又不能过小，恰能阻止气泡升浮。发泡结束后，浆体极限剪应力与塑性强度应迅速增长，加强已形成的气孔结构；泡沫混凝土的最佳发泡料浆流动度为350～450mm。

It is preparation of foam concrete by using chemical foaming,with Portland cement as the cement material,and the use of fly ash replacing part of cement. Systematically studied foam concrete slurry stability and its mechanical properties under different degrees of slurry rheology. The results showed that：the basic stable expansion condition of slurry is that in foaming stage, slurry limit shear stress or plastic strength should be small,but not too small,it can prevent bubbles floating. After the end of foaming, in order to strengthen already formed stomatal structure, slurry ultimate shear stress and plastic strength should be of rapid growth;the best slurry rheology range for foam concrete is 350～450mm.