用鄂西某赤铁矿尾矿制备蒸养砖

以鄂西某赤铁矿尾矿为主要原料,按前期试验所确定的原料配比(尾矿78%,黄砂10%,水泥10%,石膏2%)制备蒸养砖,主要考察了外加剂种类及用量、蒸养制度和自然养护周期对制品性能的影响。试验结果表明,在掺水量为15%,外加剂三乙醇胺与水泥的质量比为0.01%,成型压力为20MPa,蒸养制度为升温2h→40℃恒温6h→降温2h,自然养护周期为28d的条件下,制备的蒸养砖各项性能达到JC/T422—2007对MU15级产品的要求。

Experimental Study on Preparation of Steam Cured Bricks Made from Tailings of Hematite in Western Hubei

Taking hematite tailings from western Hubei as raw materials, the preparation of steam cured bricks is made with the mixture ratio (tailings 78%, yellow sands 10%, cements 10%, and gypsums 2%) that is determined from the pre-tests. The influence of the additional reagent type, the dosage, the steam-cured system and the natural curing period on the performance of products is studied.The results show that the performance of product can reach MU15 level at the standard of JC/T422-2007 under the conditions of water consumption 15%, the mixture ratio of triethanolamine and cement at 0.01%, compressive strength at 20 MPa, and the curing temperature rising up to 2 h, constant temperature 40 ℃ for 6 h, then temperature lowering 2 h and the natural curing period of 28 d.