轻骨料对泡沫混凝土性能的影响

Effects of light-weight aggregate on performance of foamed concrete

以水泥、植物蛋白发泡剂、粉煤灰为原料,掺加经过预湿处理的漂珠、玻化微珠,采用物理发泡法制备800 kg/m3级泡沫混凝土。采用SEM及图像分析软件对试样孔形进行表征,探讨了漂珠、玻化微珠对泡沫混凝土孔结构及性能的影响。结果表明:掺入适量玻化微珠和漂珠能增大水泥浆的流动度,减小其干缩率。掺10.0%体积玻化微珠的泡沫混凝土28 d抗压强度为8.81 MPa,导热系数为0.2027 W/(m·K);掺10.0%体积漂珠的泡沫混凝土28 d抗压强度达9.36 MPa,导热系数为0.2041 W/(m·K)。

The 800 kg/m3 foamed concrete was prepared by physical foaming using cement,vegetable protein foaming agent and fly ash as raw materials accompanied by pre-wetted glazed hollow beads(GHBs)and fly ash cenospheres(FACs).The air-void structure was characterized by SEM and image analysis software,and the effects of GHBs and FACs on pore structure and performance of foamed concrete were discussed.The results show that proper amount of pre-wetted GHBs and FACs can improve the workability of cement slurry and decrease the drying shrinkage of concrete.28 d compressive strength and thermal conductivity of the foamed concrete mixed with 10.0%GHBs are 8.81 MPa and 0.2027 W/(m·K).28 d compressive strength and thermal conductivity of the foamed concrete mixed with 10.0%FACs are 9.36 MPa,and 0.2041 W/(m·K).