工艺条件对加压发泡混凝土性能的影响

Influence of process conditions on the properties of foamed concrete under pressurized foaming

以粉煤灰和电石渣为主要原料,掺加脱硫石膏和铝粉制备发泡混凝土,研究了发泡压力、铝粉掺量、水灰比及发泡温度等工艺条件对加压发泡混凝土的绝干密度、抗压强度、塌模现象及静养脱模时间的影响规律。结果表明,加压发泡可大幅度提高试块的强度,但同时也会增加试块密度,在发泡压力为10 N时,试块抗压强度达最大值10.4 MPa,密度为824.7 kg/m^(3),较常压发泡分别提高了235.5%、57.2%。加压发泡可明显抑制塌模现象,并可大幅度缩短发泡体的静养脱模时间。

Foamed concrete was prepared using fly ash and carbide slag as the main raw materials,mixed with desulfurized gypsum and aluminum powder.The influences of foaming pressure,aluminum powder content,water-cement ratio and foaming temperature on the absolute dry density,compressive strength,collapse and demolding time of the foamed concrete were investigated.The results show that compared with normal pressure foaming,pressure foaming can greatly improve the strength of the sample,but also increase the density of the sample to a certain extent.When the foaming pressure was 10 N,the compressive strength of the test block reached the maximum value of 10.4 MPa,which was 235.5%higher than that of the normal pressure foaming,and the density was 824.7 kg/m^(3),which was 57.2%higher than that of normal pressure foam.Pressurized foaming can obviously inhibit the collapse of foaming body,and significantly shorten the demold time of the foaming body.