铅锌尾矿/电石渣基加气混凝土的组成及结构  

Composition and Structure of Autoclaved Aerated Concrete Containing Leading-Zinc Tailings and Carbide Slag

作　　者：梁宝瑞 王长龙[2] 平浩岩 刘治兵 马锦涛 郑永超[3] 荆牮霖 齐洋 翟玉新 刘枫 LIANG Baorui;WANG Changlong;PING Haoyan;LIU Zhibing;MA Jintao;ZHENG Yongchao;JING Jianlin;QI Yang;ZHAI Yuxin;LIU Feng(Tianjin College,University of Science and Technology Beijing,Tianjin 301830,China;School of Civil Engineering,Hebei University of Engineering,Handan 056038,Hebei,China;State Key Laboratory of Solid Waste Reuse for Building Materials,Beijing Building Materials Academy of Science Research,Beijing 100041,China;China Railway Construction Group Co.,Ltd.,Beijing 100040,China;Construction Development Co.,Ltd.,China Railway Construction Group,Beijing 100070,China)

机构地区：[1]北京科技大学天津学院,天津301830 [2]河北工程大学土木工程学院,河北邯郸056038 [3]北京建筑材料科学研究总院有限公司,固废资源化利用与节能建材国家重点实验室,北京100041 [4]中铁建设集团有限公司,北京100040 [5]中铁建设集团建筑发展有限公司,北京100070

出　　处：《材料导报》2024年第14期144-150,共7页Materials Reports

基　　金：国家重点研发计划(2021YFC1910605);河北省自然科学基金(E2020402079);河北省科技重大专项项目(21283804Z);固废资源化利用与节能国家重点实验室开放基金(SWR-2023-007);国家环境保护矿冶资源利用与污染控制重点实验室开放基金(HB202306);中铁建设集团有限公司科技研发计划(22-14b,22-11b)。

摘　　要：为了综合利用固体废弃物,以铅锌尾矿和电石渣为原料制备加气混凝土(AAC)。综合应用宏观与微观的分析方法,研究了铅锌尾矿的细度和掺量对加气混凝土性能的影响,以及不同养护阶段加气混凝土的物相组成、微观结构和蒸压反应机理。结果表明:随着铅锌尾矿细度减小,料浆的流动性提高,水化反应速度加快。但细度过小,易导致料浆过稠,影响加气混凝土良好气孔结构形成和性能;铅锌尾矿掺量过大,体系内未反应的铅锌尾矿残余颗粒堆积增多,颗粒间缝隙减小,影响了水化产物的生长和结晶,导致加气混凝土制品性能下降;当铅锌尾矿比表面积为420 m^(2)/kg、掺量为63%(质量分数)时,加气混凝土的绝干密度和抗压强度分别为590 kg/m^(3)、4.98 MPa,达到了《蒸压加气混凝土砌块》(GB/T 11968-2020)规定的A3.5、B06级加气混凝土合格品的要求。静停养护前加气混凝土坯体内水化产物为C-S-H凝胶和钙矾石(AFt),经静停和蒸压养护后AFt分解,主要水化产物为C-S-H凝胶和托贝莫来石。For comprehensive utilization of solid wastes,the autoclaved aerated concrete(AAC)was prepared using lead-zinc tailings and carbide slag.The effect of fineness and content of lead-zinc tailings on the properties of AAC,and the phase composition,microstructure,and autoclave reaction mechanism of AAC at different curing stages were investigated by macro and micro analysis methods.The results show that the fluidity of the slurry increases and the hydration reaction speed increases as the fineness of lead-zinc tailings decreases.However,if the fineness is too small,it is easy to cause the slurry to be too thick,affecting the formation and property of good pore structure of AAC.If the content of lead-zinc tailings is too large,the accumulation of unreacted residual particles of lead-zinc tailings in the system increases,and the gap between particles decreases,which affects the growth and crystallization of hydration products,leading to a decline in the properties of AAC products.When the specific surface area of lead-zinc tailings is 420 m^(2)/kg and its content is 63wt%,the AAC is prepared with bulk density of 590 kg/m^(3)and compressive strength of 4.98 MPa,which meet the requirements of A3.5,B06 level of AAC produce regulated by‘autoclaved aerated concrete block’(GB/T 11968-2020).The main hydration products in the body before static maintenance are C-S-H gel and AFt.And then AFt decomposes,the hydration products change to be tobermorite and C-S-H gel after static maintenance and autoclaved.

关 键 词：铅锌尾矿 电石渣 加气混凝土 静停养护 托贝莫来石 

分 类 号：TU522[建筑科学—建筑技术科学]