| 差异含水率条件下飞灰及其螯合物的应力应变及环境特性 |
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| 引用本文： | 唐强,陈辉,高玉峰,陈甦,尹立新,司维琦.差异含水率条件下飞灰及其螯合物的应力应变及环境特性[J].土木建筑与环境工程,2018,40(2):19-25. |
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| 作者姓名： | 唐强 陈辉 高玉峰 陈甦 尹立新 司维琦 |
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| 作者单位： | 苏州大学轨道交通学院,江苏苏州215137;河海大学岩土力学与堤坝工程教育部重点实验室,南京210098;河海大学江苏省岩土工程技术工程研究中心,南京210098
苏州大学轨道交通学院,江苏苏州,215137
河海大学岩土力学与堤坝工程教育部重点实验室,南京210098;河海大学江苏省岩土工程技术工程研究中心,南京210098
河海大学岩土力学与堤坝工程教育部重点实验室,南京210098;河海大学江苏省岩土工程技术工程研究中心,南京210098;常熟理工学院经济与管理学院,江苏常熟215500 |
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| 基金项目： | National Natural Science Foundation of China(51708377)，Natural Science Foundation of Jiangsu Province(BK20170339)，Natural Science Found for Colleges and Universities in Jiangsu Province(17KJB560008)，Project from Jiangsu Provincial Department of Housing and Urban-Rural Development (No.2016ZD18、2017ZD002)国家自然科学基金(51708377)，江苏省自然科学基金(BK20170339)，江苏省高等学校自然科学研究项目(17KJB560008)，江苏省建设系统科技项目(2016ZD18、2017ZD002) |
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| 摘 要： | 垃圾焚烧飞灰因极高的重金属含量而被认为是一种危险废弃物,但与火山灰成分的相似使该材料有着资源化利用的潜在价值。以飞灰及其螯合物为研究对象,探讨了含水率、养护条件等因素对材料应力应变及环境特性的影响。研究结果表明:飞灰螯合物重金属浸出浓度较低,并有着较强的吸水特性;飞灰及其螯合物强度早期随着养护时间的增长呈上升趋势,破坏应变随之减小,脆性不断增大;材料强度在中后期出现明显分化,飞灰(90%湿度养护)强度约为螯合飞灰的23.11倍。飞灰强度随含水率的增大而减小,可归结于孔隙水对压实能量的吸收和结构的影响;螯合飞灰强度均随养护时间和含水率增加而显著增大。
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| 关 键 词： | 飞灰 含水率 养护条件 应力-应变 重金属浸出 fly ash moisture content curing condition stress-strain leaching of heavy metals |
| 收稿时间： | 2017/4/24 0:00:00 |
Stress-strain and leaching behaviors of fly ash and chelated fly ash under various moisture content |
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| Tang Qiang,Chen Hui,Gao Yufeng,Chen Su,Yin Lixin and Si Weiqi.Stress-strain and leaching behaviors of fly ash and chelated fly ash under various moisture content[J].土木建筑与环境工程,2018,40(2):19-25. |
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| Authors: | Tang Qiang Chen Hui Gao Yufeng Chen Su Yin Lixin and Si Weiqi |
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| Affiliation: | School of Rail Transportation, Soochow University, Suzhou 215137, Jiangsu, P. R. China;Key Laboratory of Ministry of Education for Geomechanics and Embankment Engineering, Hohai University, Nanjing 210098, P. R. China;Jiangsu Research Center for Geotechnical Engineering Technology, Hohai University, Nanjing 210098, P. R. China,School of Rail Transportation, Soochow University, Suzhou 215137, Jiangsu, P. R. China,Key Laboratory of Ministry of Education for Geomechanics and Embankment Engineering, Hohai University, Nanjing 210098, P. R. China;Jiangsu Research Center for Geotechnical Engineering Technology, Hohai University, Nanjing 210098, P. R. China,School of Rail Transportation, Soochow University, Suzhou 215137, Jiangsu, P. R. China,Key Laboratory of Ministry of Education for Geomechanics and Embankment Engineering, Hohai University, Nanjing 210098, P. R. China;Jiangsu Research Center for Geotechnical Engineering Technology, Hohai University, Nanjing 210098, P. R. China;College of Economics and Management, Changshu Institute Technology, Changshu 215500, Jiangsu, P. R. China and School of Rail Transportation, Soochow University, Suzhou 215137, Jiangsu, P. R. China |
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| Abstract: | Fly ash,as a kind of solid waste,attracts increasing attention in the recent years.In this paper,the stress-strain and leaching behavior of fly ash and chelating fly ash under various moisture contents were studied.According to the test results,moisture content,curing conditions have significant effects on the compressive strength,failure strain.The heavy metals leaching from fly ash can almost meet the requirement of environment.The strength of fly ash and chelating fly ash rise with the increase of curing time,while the failure strain decreases at earlier period.In the later period of curing time,the compressive strength exhibits different trend,by which the strength of fly ash in curing boxes is about 23.11 times of the chelating fly ash.Among them,the strength of fly ash increases with the decrease of water content under different curing conditions,due to the influence of pore water on the absorption and structure of compaction energy;in addition,the strength of chelating fly ash in curing boxes increases with the increase of the curing time and water content. |
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| Keywords: | fly ash moisture content curing condition stress-strain leaching of heavy metals |
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