铁尾矿废石免烧透水砖制备及性能研究

Preparation of non-fired water permeable bricks with iron ore waste rock and its performance research

以铁尾矿废石、水泥和铁尾矿粉为原材料,静压成型制备铁尾矿废石免烧透水砖,研究了成型压力、保压时间、养护时间、水胶比、孔隙率对透水砖抗压强度、透水系数的影响,通过SEM分析样品的微观形貌。结果表明:配合比设计参数为设计孔隙率20%,水泥10%,铁尾矿粉10%,铁尾矿废石80%,水胶比0.4,减水剂掺量为1.5%;透水砖的最佳工艺条件为成型压力8 MPa,保压时间50 s,标准养护28 d,在此条件下制得的透水砖抗压强度为10.4 MPa,透水系数为2.24×10^(-2) cm/s。

Using iron mine waste rock as aggregate and adding appropriate auxiliary materials such as cement and iron tailings,non-fired water permeable bricks were produced by hydrostatic forming process.The effects of molding pressure,holding time,curing time,water cement ratio,and porosity on the compressive strength and permeability coefficient of permeable bricks were studied,and the microstructure of the samples was analyzed through SEM photos.The test results show that the design parameters of the mix ratio were as follows:porosity was 20%,cement was 10%,iron tailings powder was 10%,iron tailings waste rock was 80%,the ratio of water-cement was 0.40,and water-reducing agent was 1.5%.The optimal process conditions for obtaining permeable bricks were:the molding pressure was 8 MPa,and the pressure holding time was 50 s,standard curing for 28 d.Under the condition of this processing,non-fired water permeable bricks with the compressive strength of 10.4 MPa and the permeation coefficient of 2.24×10^(-2) cm/s were obtained.