大比例掺用铁尾矿制备轻质保温墙体材料

Preparation of Lightweight Thermal Insulation Walling Material with High Content of Iron Tailings

以水泥为胶凝剂、黄石市灵乡铁矿尾矿为主要原料制备轻质保温墙体材料,研究了轻骨料膨胀珍珠岩、铁尾矿及其碱性激发剂掺量和水灰比对试件抗压强度、容重、导热系数的影响。结果表明:试验用碱性激发剂对铁尾矿的活性有显著的激发作用,从而可提高铁尾矿的掺用比例、减少水泥用量;当水泥、铁尾矿、激发剂、膨胀珍珠岩的质量比为1:2.5:0.25:0.63,水灰比为0.8时,试件28d的抗压强度>5MPa、容重<900kg/m3、导热系数<0.231W/(m·k),满足轻质保温墙体材料的性能要求。

With common cement as the gelling agent, iron tailing from Lingxiang in Huangshi as the raw material to prepare the lightweight heat insulation walling material, the effect of lightweight aggregate of expanded perlite, iron tailings, the dosage of alkali activator, the water-cement ratio on the compressive strength, bulk density, thermal conductivity are studied. The results show that the alkaline activator in the test has a significant activation on the activity of iron ore tailings, which can increase the dosage proportion of iron tailings and reduce the amount of cement. When the mass ratio of cement, iron tailings, activator and expanded perlite is 1 ： 2.5： 0.25：0.63 and the water-cement ratio is 0.8, the test materials own compressive strength 〉 5 MPa, bulk density 〈 900 kg/m3, and thermal conductivity of 〈 0. 231 W/（ m · k） at 28 d, which can meet the performance requirements of lightweight insulation walling material.