论文部分内容阅读
以低贫钒钛铁尾矿为主要原料制备蒸养加气混凝土,考察了铁尾矿掺量与粒度、硅砂掺量与粒度及石灰、水泥用量的影响,分析了产品物相和形貌.结果表明,制备加气混凝土的最优条件为铁尾矿:硅砂:石灰:水泥:石膏质量比45:20:19:14:2,铝粉掺量为0.09%,水料质量比为0.60.该条件下成品的抗压强度为3.52 MPa,干体积密度为620.8kg/m3,达到蒸压加气混凝土性能国家标准.蒸养前制品中多为低结晶度、无定型的C?S?H凝胶水化物相和铁尾矿颗粒相及部分钙矾石相,蒸养后成品中形成大量结晶良好的托贝莫来石,并与其他水化产物的晶簇集合体和骨料相互交织,形成致密的结晶网状结构,可提高加气混凝土制品的性能.
The low lean vanadium titano-iron tailing was taken as the main raw material to prepare the steam-cured aerated concrete. The influence of iron tailings content and particle size, content and particle size of silica sand, lime and cement dosage were investigated. The phase and morphology of the products were analyzed. The results show that the optimum conditions for the preparation of aerated concrete are iron tailings: silica sand: lime: cement: gypsum mass ratio 45:20:19:14: 2, aluminum powder content 0.09% and water mass ratio 0.60. Under these conditions, the compressive strength of the finished product is 3.52 MPa and the dry bulk density is 620.8 kg / m3, reaching the national standard of autoclaved aerated concrete performance. Most of the products before steam curing are of low crystallinity and amorphous C? S? H Gel hydrate phase and iron tailings particle phase and part of ettringite phase, after steaming the finished product to form a large number of well-crystallized tobober mullite, and with other hydration products of crystal cluster and aggregates intertwined , Forming a dense crystalline network structure, can improve the performance of aerated concrete products.