摘要
以城市垃圾焚烧灰为主要研究对象,采用水、磷酸分别对其进行预处理,对预处理后的飞灰采用水泥进行固化,测定固化体系的凝结时间、净浆抗压强度、无侧限抗压强度等物理力学性能,并检测固化体系的重金属浸出毒性。试验结果表明,固化体系的凝结时间随着水泥掺量的增加而缩短,水泥掺量超过20%时,固化体系的终凝时间能控制在10h以内;体系的净浆抗压强度、无侧限抗压强度均随着水泥掺量的增加而增大,其中,各固化体系的无侧限抗压强度值均达到稳定土填埋强度值(1.5MPa),重金属浸出浓度满足国家毒性浓度危险标准值(5～100mg/L)。
Municipal Solid Waste Incineration （MSWI）Ash was pretreated using water or phosphate,then,pretreated MSWI ash was solidified by cement.The setting time, compressive strength of the paste, unconfined compressive strength and other physical and mechanical properties of the solidification system as well as its heavy metals leaching toxicity were measured.The results show that with the increasing of cement content,the setting time of solidification system shorten,and when the cement content is more than 20%,the final setting time of the system can be controlled within 10h. The compressive strength of the paste and unconfined compressive strength of solidification system increase with the increasing of cement content.The unconfined compressive strength of each system can reach the stable soil landfill strength values （I.SMPa）.The concentration of heavy metals can meet the national toxic concentrations risk standard value（5-100mg/L）.
出处
《混凝土与水泥制品》
北大核心
2013年第11期86-88,共3页
China Concrete and Cement Products
基金
江苏省高校自然科学基金项目(11KJD560002)
苏州科技学院科研基金青年项目(Z2119)
苏州科技学院青年骨干教师培养对象基金资助项目
关键词
垃圾焚烧灰
预处理
固化
无侧限抗压强度
重金属浸出毒性
Solid Waste Incineration Ash
Pretreatment
Solidification
Unconfined compressive strength
Heavy met- als leaching toxicity
