| 摘要: |
| 测试了掺Pb(NO3)2的磷酸钾镁水泥（MKPC）浆体的流动度、凝结时间、抗压强度、收缩变形和重金属Pb的浸出质量浓度，分析了MKPC浆体的水化放热特性、物相组成和微观形貌.结果表明：复合缓凝剂和适量Pb(NO3)2可有效延缓MKPC浆体的凝结时间；掺入适量Pb(NO3)2虽然会降低MKPC浆体的抗压强度，并使其收缩变形略微增加，但掺10%（质量分数）Pb(NO3)2的MKPC浆体28d抗压强度仍大于20MPa，其收缩变形仍比硅酸盐水泥砂浆小1个数量级；在相同水化龄期，MKPC浆体中重金属Pb的浸出质量浓度随着Pb(NO3)2掺量的增加逐步升高，但在掺10%Pb(NO3)2的MKPC浆体中，重金属Pb的浸出质量浓度仍远低于GB 50853—2007标准要求. |
| 关键词: 磷酸钾镁水泥 重金属Pb 抗压强度 Pb浸出质量浓度 |
| DOI：103969/j.issn1007 9629201601005 |
| 分类号: |
| 基金项目:住房和城乡建设部科研开发项目(2011 K4 23，2013 K7 4,2013 K4 41)；江苏省科技厅项目（BY2013057 05） |
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| Properties of Magnesium Potassium Phosphate Cement Containing Heavy Metal Pb |
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XU Xuanchen1, YANG Jianming1, GU Yuping2
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1.College of Civil Engineering, Yancheng Institute of Technology, Yancheng 224051, China;2.Jiangsu CollaborativeInnovation Center for Ecological Building Materials and Environmental Protection, Yancheng 224051, China
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| Abstract: |
| To study properties of magnesium potassium phosphate cement(MKPC) containing heavy metal Pb, the fluidity, setting time, compressive strength, shrinkage deformation and leachate mass concentration of heavy metal Pb were determined. Its hydration heat, phase composition and micro structure were analyzed. The result indicates that the composite retarder and some Pb(NO3)2 are able to effectively retard setting of MKPC paste. Adding of some Pb(NO3)2 reduces the compressive strength of MKPC paste and slightly increases its shrinkage deformation, but 28d compressive strength of MKPC paste with 10% (by mass) Pb(NO3)2 is higher than 20MPa and its shrinkage deformation is almost one order of magnitude lower than that of Portland cement mortar. Pb leachate mass concentration in MKPC paste gradually increases with increase of Pb(NO3)2 content, Pb leachate mass concentration in MKPC paste with 10%Pb(NO3)2 is much lower than that set forth in the standard of ‘Identification of standard for hazardous wastes’ (GB 50853—2007). |
| Key words: magnesium potassium phosphate cement(MKPC) heavy metal Pb compressive strength Pb leachate mass concentration |
