高强度低导热泡沫混凝土性能研究

在工程实践中,作为装配式建筑的墙体材料,既要有较好的保温隔热性能,又要满足一定的力学性能。轻质泡沫混凝土是一种很好的选择,但普通的泡沫混凝土材料在满足热工性能时其力学性能往往表现较差。本文提出一种高强度低导热泡沫混凝土制备方法,研究了水胶比、泡沫掺量、粉煤灰掺量和聚丙烯(PP)纤维掺量对泡沫混凝土的抗压强度和导热系数的影响,并采用扫描电镜(SEM)探究了粉煤灰和PP纤维对泡沫混凝土微观形貌的影响。结果表明:当水胶比为0.6、泡沫掺量为4%(质量分数,下同)、粉煤灰掺量为25%以及PP纤维掺量为0.2%时,泡沫混凝土的抗压强度较高且导热系数较低。

Performance of High Strength and Low Thermal Conductivity Foamed Concrete

In engineering practice, as the wall material of prefabricated buildings, this wall material not only requires better thermal insulation performance, but also meets certain mechanical properties requirements. Light foamed concrete is a good choice for this wall material. But the mechanical properties of light foamed concrete are often poor when it meets the thermal properties requirements. A preparation method of high strength and low thermal conductivity foamed concrete was proposed. The effects of water-binder ratio, foam content, fly ash content and polypropylene (PP) fiber content on the compressive strength and thermal conductivity of foamed concrete were studied through mix ratio experiment. In view of scanning electron microscope (SEM) of foamed concrete, the influences of fly ash and PP fiber on compressive strength and thermal conductivity of foamed concrete are revealed. The results show that when the water-binder ratio is 0.6, the content of foam is 4% (mass fraction, the same below), the content of fly ash is 25% and the content of PP fiber is 0.2%, the foamed concrete has higher compressive strength and lower thermal conductivity.