铅锌尾矿材性分析及在混凝土中的应用研究  

Analysis of Material Properties of Lead Zinc Tailings and Its Application in Concrete

作　　者：张召 Zhang Zhao(Ganjiang New Area Urban Construction Technology Co.Ltd.,Jiujiang,Jiangxi 330300)

机构地区：[1]赣江新区城建科技有限公司,江西九江330300

出　　处：《江西建材》2024年第11期64-66,共3页

摘　　要：文中所用铅锌尾矿的主要化学成分为SiO_(2)、Fe_(2)O_(3)、CaO等,其亚甲蓝值、安定性、SO_(3)、游离氧化钙、需水量比、总碱量、氯离子含量等指标均满足标准要求,28 d活性指数为72%。其放射性核素限量,铜、镉、铅、总铬、铬(六价)、锌、砷重金属浸出毒性等安全性指标满足标准要求。与采用Ⅱ级粉煤灰作掺合料的C30基准混凝土相比,使用铅锌尾矿代替Ⅱ级粉煤灰组的混凝土坍落度由180 mm降至170 mm;7 d抗压强度值小1 MPa,降低2.9%,28 d抗压强度小1.3 MPa,降低3.2%;经过50次冻融循环后,掺铅锌尾矿粉的混凝土动弹性模量保持率比掺Ⅱ级粉煤灰组混凝土低2.5%,但动弹性模量保持率仍达到84.5%;两组混凝土试件的抗渗等级均达到P8。掺铅锌尾矿粉未明显降低混凝土塌落度、强度、抗冻性等性能,用作混凝土掺合料具有可行性。The main chemical components of the lead-zinc tailings used in this experiment are SiO_(2),Fe_(2)O_(3),CaO,et al.Its methylene blue value,stability,SO_(3),free calcium oxide,water demand ratio,total alkali content,chloride ion content and other indicators meet the standard requirements.Its 28 day activity index is 72%.The limit of radioactive nuclides,safety indicators such as copper,cadmium,lead,total chromium,chromium(hexavalent),zinc,and arsenic leaching toxicity meet the standard requirements.Compared with C30 benchmark concrete using Grade II fly ash as admixture,the slump of concrete using lead-zinc tailings instead of Grade II fly ash decreased from 180mm to 170mm;The 7-day compressive strength value is 1 MPa lower,2.9%lower,and the 28-day compressive strength is 1.3 MPa lower,3.2%lower;After 50 freeze-thaw cycles,the retention rate of dynamic elastic modulus of concrete mixed with lead-zinc tailings powder was 2.5%lower than that of concrete mixed with grade II fly ash,but the retention rate of dynamic elastic modulus still reached 84.5%,;The anti-seepage grade of both groups of concrete specimens reached P8.The addition of lead-zinc tailings powder does not significantly reduce the slump,strength,frost resistance,and other properties of concrete,making it feasible for use as a concrete admixture.

关 键 词：铅锌尾矿 材性分析 塌落度 抗压强度 抗冻性 抗渗性 

分 类 号：TU528[建筑科学—建筑技术科学]