Fabrication of Baking-Free Bricks Using Gold Tailings and Cemented Materials with Low Alkalinity  

作　　者：Jiamao Li Tao Si Lin Li Chuangang Fan Zhaofang He Yuandi Qian 

机构地区：[1]School of Materials Science and Engineering,Anhui University of Technology,Maanshan,243032,China [2]Key Laboratory of Green Fabrication and Surface Technology of Advanced Metal Materials,Ministry of Education,Maanshan,243002,China [3]China MCC17 Group Co.,Ltd.,Maanshan,243000,China

出　　处：《Journal of Renewable Materials》2022年第11期3041-3058,共18页可再生材料杂志（英文）

基　　金：the Key Research and Development Program of Anhui Province(No.202004a07020039).

摘　　要：The purpose of this paper was using gold mine tailings and cemented materials with low alkalinity to fabricate baking-free bricks.The obtained baking-free brick samples were evaluated by unconfined compressive strength(UCS),water absorption percentage,freezing-thawing cycle,and drying-wetting cycle.The microstructures of the baking-free brick samples were analyzed using X-ray diffraction(XRD)and scanning electron microscope(SEM)techniques.The baking-free brick specimens cured for 28 days with the addition of 10%mixing water consumption and 1:6 cement/tailing ratio tended to obtain favorable comprehensive properties such as a high compressive strength of 15.15 MPa,a low water absorption percentage of 11.8%,excellent freezing-thawing resistance with a 8.9%UCS loss rate after 15 freezing-thawing cycles and good drying-wetting resistance with a 11%UCS loss rate after 10 drying-wetting cycles.The XRD and SEM test results verified that different kinds of hydrate products including C-S-H and C-S-A-H gels,and ettringite were produced during hydration process,which were responsible for good physical,mechanical properties,and durability of the obtained baking-free bricks.Therefore,the experimental results showed that it was practical and reasonable to utilize the homemade cementitious materials in our laboratory to stabilize the gold tailings for production of baking-free bricks,which still met the requirements of major regional construction standards in some countries.

关 键 词：Baking-free brick low alkali cementitious binder solid waste utilization compressive strength FREEZING-THAWING drying-wetting 

分 类 号：TU522.1[建筑科学—建筑技术科学]