摘要
采用锂瓷石尾矿等质量替代0、20%、40%、60%、80%、100%的天然砂制备了蒸压加气混凝土,研究了锂瓷石尾矿的湿磨时间和替代率以及蒸压养护制度对蒸压加气混凝土性能的影响。结果表明:未湿磨时,锂瓷石尾矿替代率为60%试件的抗压强度与表观密度比(σ/ρ)较对照组降低了19.1%,制备出的产品不合格;锂瓷石尾矿的最佳湿磨时间宜控制在20~30 min;锂瓷石尾矿越细,制备出的蒸压加气混凝土的σ/ρ值越大;在锂瓷石尾矿替代率为60%的情况下,与未湿磨相比,湿磨30 min时试件的σ/ρ值从0.13增至0.67;随着恒压时间的增加,σ/ρ值增大,恒压时间宜控制在6~8 h。工业化实际生产表明,当锂瓷石尾矿的湿磨时间为30 min、替代率为60%时,可制备出A3.5强度等级、B06密度等级的合格产品,且产品的放射性、浸出毒性等安全性指标合格。
The autoclaved aerated concrete was prepared by replacing 0,20%,40%,60%,80%,100%natural sand with lithium porcelain stone tailings,and the influence of wet grinding time and replacement rate of lithium porcelain stone tailings and autoclave curing method on the performance of autoclaved aerated concrete was studied.The results show that when the replacement rate of non wet grinding lithium porcelain stone tailings is 60%,the ratio of compressive strength to apparent density(σ/ρ)of the specimen is decreased by 19.1%compared with the control group,and the prepared product is unqualified.The optimum wet grinding time of lithium porcelain stone tailings should be controlled within 20~30 minutes.The finer the lithium porcelain stone tailings is,the larger theσ/ρvalue is.When the replacement rate of lithium porcelain stone tailings is 60%,theσ/ρvalue of the specimen after wet grinding for 30 min increases from 0.13 to 0.67 compared with the specimen without wet grinding.With the increase of constant pressure time,theσ/ρvalue increases,the constant pressure time should be controlled within 6~8 h.The practical industrial production shows that when the wet grinding time of lithium porcelain stone tailings is 30 min and the replacement rate is 60%,qualified products with A3.5 strength grade and B06 density grade can be prepared,and the safety indexes such as radioactivity and leaching toxicity of the products are qualified.
作者
黄高明
刘红霞
刘澜涛
王红英
HUANG Gao-ming;LIU Hong-xia;LIU Lan-tao;WANG Hong-ying(Jiangxi Building Materials Research and Design Institute Co.,Ltd.,Nanchang 330001,China)
出处
《混凝土与水泥制品》
2022年第11期72-75,共4页
China Concrete and Cement Products
基金
江西省重点研发计划项目“双碳”专项项目(20214BBG74002)。
关键词
锂瓷石尾矿
蒸压加气混凝土砌块
湿磨
抗压强度
表观密度
浸出毒性
Lithium porcelain stone tailing
Autoclaved aerated concrete block
Wet grinding
Compressive strength
Apparent density
Leaching toxicity
