低吸湿泡沫混凝土的设计及物理性能

Design and Physical Properties of Foamed Concrete with Low Hygroscopicity

为了构筑低吸湿泡沫混凝土并再生利用热解污泥,以表观密度、导热系数和28 d抗压强度为指标,采用正交设计试验确定了热解污泥粉、甲基硅醇钠和纳米二氧化硅的合理掺量,进而研究了最优组合泡沫混凝土的物理性能.结果表明:以表观密度和导热系数为衡量指标时,热解污泥粉、甲基硅醇钠和纳米二氧化硅的合理掺量分别为30%、1.5%、3.0%,而以28 d抗压强度为衡量指标时,三者的合理掺量分别为10%、0.5%、3.0%;1.5%的甲基硅醇钠使得泡沫混凝土的吸湿性降低了90.6%~95.5%;最优组合泡沫混凝土的导热系数、表观密度和强度满足FC5自保温泡沫混凝土的基本要求.

In order to construct the foamed concrete with low hygroscopicity meanwhile to recycle pyrolysis sludge ash(PSA)effectively,the reasonable dosage of PSA,sodium methyl-silanol(SMS)and nano-SiO_(2) was studied by using orthogonal design in which the apparent dry density,thermal conductivity and 28 d compressive strength were set as the measuring indicators.Then the physical properties of the foamed concrete with optimal proportion were investigated.The results show that,if setting the apparent dry density and thermal conductivity as the measuring indicators,the reasonable dosage of PSA,SMS and nano-SiO_(2) are 30%,1.5%and 3.0%,respectively.If taking the 28 d compressive strength as the measuring indicator,the reasonable dosage of these three raw materials are 10%,0.5%and 3.0%respectively.In addition,the results show the addition of 1.5%SMS reduces the hygroscopicity of the foamed concrete by 90.6%-95.5%as compared to the control one without SMS.The thermal conductivity,density and strength of the foamed concrete with optimal proportion meet the basic requirements of FC5 self-insulating blocks.