淤泥基免烧陶粒的制备及性能影响因素  

Preparation and Performance Influencing Factors of Silt-Based Non-Sintered Ceramsite

作　　者：高鹏 徐悦清 曹云 韩燕[1,2,3] 刘荣 GAO Peng;XU Yueqing;CAO Yun;HAN Yan;LIU Rong(School of Environment,Nanjing Normal University,Nanjing 210023,China;Jiangsu Provincial Key Laboratory of Materials Cycling and Pollution Controlling,School of Geography Science,Nanjing Normal University,Nanjing 210023,China;Jiangsu Center for Collaborative Innovation in Geographical Information Resource Development and Application,Nanjing 210023,China;Nanjing Institute of Environmental Sciences,Ministry of Ecology and Environment of the People’s Republic of China,Nanjing 210042,China)

机构地区：[1]南京师范大学环境学院,南京210023 [2]南京师范大学地理科学学院,江苏省物质循环与污染控制重点实验室,南京210023 [3]江苏省地理信息资源开发与利用协同创新中心,南京210023 [4]生态环境部南京环境科学研究所,南京210042

出　　处：《硅酸盐通报》2021年第3期889-899,共11页Bulletin of the Chinese Ceramic Society

基　　金：“十三五”国家重点研发计划(2018YFD1101001)。

摘　　要：以疏浚淤泥为主要原料制备免烧陶粒,并探究了淤泥/水泥比、粘结剂添加量、石膏添加量和养护时间对陶粒性能的影响。结果表明,淤泥基免烧陶粒的最佳原料配比和养护工艺为淤泥/水泥比2.5(质量比),石膏添加量10%(质量分数),粘结剂添加量1%(质量分数),养护时间28 d。该条件下制得的陶粒颗粒抗压强度为4.49 MPa,颗粒密度为1.3 g·cm^(-3),1 h吸水率为9.78%。满足GB/T 17431.1—2010《轻集料及其试验方法》中普通轻质骨料的性能指标。经扫描电子显微镜(SEM)与X射线衍射仪(XRD)分析发现,最优条件下陶粒内部孔隙封闭,晶粒紧密结合,水化硬化反应生成水化硅酸钙(C-S-H)和钙长石类晶态组织,有利于提高陶粒的综合物理性能。Using dredged silt as the main raw material to prepare non-sintered ceramsite,realize the resource utilization of silt.Compared with traditional silt treatment methods,it reduces land occupation and secondary environmental pollution caused by silt stacking,and has significant advantages.The effects of silt/cement ratio,binder addition,gypsum addition and curing time on the performance of ceramsite were explored through experimental analysis.The results show that the best raw material ratio and curing process for silt-based non-sintered ceramsite is silt/cement ratio 2.5(mass ratio),gypsum addition 10%(mass fraction),binder addition 1%(mass fraction),and curing time 28 d.The compressive strength of ceramsite prepared under these condition is 4.49 MPa,the particle density is 1.3 g·cm^(-3),and the 1 h water absorption is 9.78%.Meet the performance indicators of ordinary lightweight aggregate in GB/T 17431.1—2010"Lightweight aggregate and its test method".SEM and XRD analyses show that the internal pores of ceramsite are closed under the optimal condition,and the crystal grains are tightly combined.The C-S-H and anorthite-like crystalline structure formed by the hydration and hardening reaction are beneficial to improve the comprehensive physical properties of ceramsite.

关 键 词：免烧陶粒 疏浚淤泥 水化硬化 资源化 石膏 养护时间 

分 类 号：X705[环境科学与工程—环境工程]