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.
作者
高鹏
徐悦清
曹云
韩燕
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)
出处
《硅酸盐通报》
CAS
北大核心
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)。
关键词
免烧陶粒
疏浚淤泥
水化硬化
资源化
石膏
养护时间
non-sintered ceramsite
dredged silt
hydration and hardening
resource utilization
gypsum
curing time
