淤泥基免烧陶粒的制备及性能影响因素

硅酸盐通报 ›› 2021, Vol. 40 ›› Issue (3): 889-899.

淤泥基免烧陶粒的制备及性能影响因素

高鹏^1,2,3, 徐悦清⁴, 曹云^1,2,3, 韩燕^1,2,3, 刘荣^1,2,3

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

收稿日期:2020-09-21 修回日期:2020-11-30 出版日期:2021-03-15 发布日期:2021-04-13
通讯作者: 刘荣,博士,教授。E-mail:liurongnjnu@126.com
作者简介:高鹏(1996—),男,硕士研究生。主要从事固体废物资源化利用方面的研究。E-mail:1228432420@qq.com
基金资助:
“十三五”国家重点研发计划(2018YFD1101001)

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

GAO Peng^1,2,3, XU Yueqing⁴, CAO Yun^1,2,3, HAN Yan^1,2,3, LIU Rong^1,2,3

1. School of Environment, Nanjing Normal University, Nanjing 210023, China;
2. Jiangsu Provincial Key Laboratory of Materials Cycling and Pollution Controlling, School of Geography Science, Nanjing Normal University, Nanjing 210023, China;
3. Jiangsu Center for Collaborative Innovation in Geographical Information Resource Development and Application, Nanjing 210023, China;
4. Nanjing Institute of Environmental Sciences, Ministry of Ecology and Environment of the People’s Republic of China, Nanjing 210042, China

Received:2020-09-21 Revised:2020-11-30 Online:2021-03-15 Published:2021-04-13

摘要/Abstract

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。

关键词: 免烧陶粒, 疏浚淤泥, 水化硬化, 资源化, 石膏, 养护时间

Abstract: 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.

Key words: non-sintered ceramsite, dredged silt, hydration and hardening, resource utilization, gypsum, curing time

中图分类号:

X705

高鹏, 徐悦清, 曹云, 韩燕, 刘荣. 淤泥基免烧陶粒的制备及性能影响因素[J]. 硅酸盐通报, 2021, 40(3): 889-899.

GAO Peng, XU Yueqing, CAO Yun, HAN Yan, LIU Rong. Preparation and Performance Influencing Factors of Silt-Based Non-Sintered Ceramsite[J]. BULLETIN OF THE CHINESE CERAMIC SOCIETY, 2021, 40(3): 889-899.

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