铅锌尾矿制备防辐射混凝土的实验研究

Experimental Study on Preparation of Radiation Shield Concrete from Lead-Zinc Tailings

将福建大田地区的铅锌尾矿用于研制铅锌尾矿水泥混合材,再用该水泥混合材与重晶石等原料制备铅锌尾矿防辐射混凝土。主要探讨了铅锌尾矿添加量对水泥混合材的强度影响,并研究了铅锌尾矿防辐射混凝土的坍落度、抗折强度和热稳定性等主要物理化学性能和防辐射性能。实验结果表明,铅锌尾矿的掺量在20wt.%(质量分数,下同)以下时,所制得铅锌尾矿水泥混合材的水泥强度等级均可达到42.5级通用硅酸盐水泥等级,且利用其制备出的铅锌尾矿防辐射混凝土防辐射性能良好。当用水量为190 kg/m^3、水泥用量为365 kg/m^3、细骨料用量为1130 kg/m^3、粗骨料用量为1844 kg/m^3时,所制得的防辐射混凝土粘聚性和保水性较好,坍落度为52 mm,表观密度为3510 kg/m^3,满足设计要求。

The lead-zinc tailings from Datian,Fujian were used to prepare a cementitious material,and then the radiation-preventing concrete was prepared from the mixture of the as-prepared cement material,barite,and so on.The effects of the amount of lead and zinc tailings on the strength of the cementitious composite were discussed.The main physicochemical and radiation properties of the radiation shield concrete from lead-zinc tailings were studied.The experimental results showed that when the content of lead-zinc tailings was below 20wt.%(mass fraction,the same below),the cement strength reached 42.5 universal Portland cement grade.The radiation protection performance was good.When the water consumption was 190 kg/m^3,the amount of cement was 365 kg/m^3,the amount of coarse aggregate was 1130 kg/m^3,the amount of fine aggregate was 1844 kg/m^3,the cohesiveness and water retention of the prepared radiation-proof concrete were high.The slump was 52 mm and the apparent density was 3510 kg/m^3,which satisfied the design requirements.