垃圾焚烧灰熔融重构矿渣对水泥基材料性能的影响
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摘要
研究了不同掺量下(10%、20%、30%、50%)的垃圾焚烧灰和重构矿渣对水泥基材料性能的影响,并通过扫描电镜(SEM)、X射线衍射(XRD)等测试技术分析了影响机理。研究结果表明:相比于纯水泥,垃圾焚烧灰掺量为50%的水泥基材料终凝时间缩短为75 min,标准稠度用水量增加至28.7%,重构矿渣掺量为50%的水泥基材料终凝时间延长至335 min,标准稠度用水量增加至29.8%。垃圾焚烧灰的活性较低,随着垃圾焚烧灰掺量的增加,水泥砂浆抗压强度先增大后减小,当其掺量为10%时,28 d抗压强度达到最大(51.5 MPa);重构矿渣的活性高于垃圾焚烧灰,在碱性环境的激发下,水化后期重构矿渣发生二次水化反应,生成较多的水化产物,掺重构矿渣的水泥砂浆强度先增大后减小,当重构矿渣掺量为20%时,28 d抗压强度达到最大值48.8 MPa。
Effect of the mixture blended cement with MSWI fly ash and reconstructed slag by the dosage of 10%,20%,30%,50%respectively on the properties of cement-based materials were studied,then the influence mechanism was analyzed by scanning electron microscopy(SEM),and X-ray diffraction(XRD).It turned out that,in comparison with cement,the final setting time of cement-based materials mixed with 50% MSWI fly ash was shortened to 75 min,the water requirement of normal increased to 28.7%,the final setting time of cement-based materials mixed with 50% reconstructed slag was extended to 335 min,the water requirement of normal increased to29.8%.The cementitious activity of MSWI fly ash was low,the compressive strength showed a trend of decrease after the first increase of the specimen mixed with the dosage increase of MSWI fly ash,its compressive strength surpass the pure cement strength by 51.5 MPa when the dosage was 10%.The activity of reconstructed slag was higher than MSWI fly ash,under alkaline environment,second hydration occur to reconstructed slag,and it generate large numbers of hydration products,the compressive strength showed a trend of decrease after the first increase of the specimen mixed with reconstructed slag,it had the maximum compressive strength of 48.8 MPa at curing 28 d with the dosage of 20%.
Effect of the mixture blended cement with MSWI fly ash and reconstructed slag by the dosage of 10%,20%,30%,50%respectively on the properties of cement-based materials were studied,then the influence mechanism was analyzed by scanning electron microscopy(SEM),and X-ray diffraction(XRD).It turned out that,in comparison with cement,the final setting time of cement-based materials mixed with 50% MSWI fly ash was shortened to 75 min,the water requirement of normal increased to 28.7%,the final setting time of cement-based materials mixed with 50% reconstructed slag was extended to 335 min,the water requirement of normal increased to29.8%.The cementitious activity of MSWI fly ash was low,the compressive strength showed a trend of decrease after the first increase of the specimen mixed with the dosage increase of MSWI fly ash,its compressive strength surpass the pure cement strength by 51.5 MPa when the dosage was 10%.The activity of reconstructed slag was higher than MSWI fly ash,under alkaline environment,second hydration occur to reconstructed slag,and it generate large numbers of hydration products,the compressive strength showed a trend of decrease after the first increase of the specimen mixed with reconstructed slag,it had the maximum compressive strength of 48.8 MPa at curing 28 d with the dosage of 20%.
引文
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[16]王卉.高炉熔渣形成过程及性能研究[D].北京:北京工业大学,2013.
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[2]施惠生.城市垃圾焚烧飞灰处理技术及其在水泥生产中资源化利用[J].水泥,2007(10):1-4.
[3]张庆红.我国垃圾焚烧处理现状[J].锅炉制造,2006(3):41-42.
[4]杨志泉,周少奇.垃圾焚烧飞灰中重金属污染物控制的研究进展[J].环境卫生工程,2005,13(4):36-40.
[5]李新明,王士革,乐金朝,等.城市垃圾焚烧飞灰资源化利用研究进展[J].热力发电,2010,39(5):1-5.
[6] ZHANG J L,LIU J G,et al.Comparison of the fixation of heavy metals in raw material,clinker and mortar using a BCR sequential extraction procedure and NEN7341 test[J].Cement and Concrete Research,2008(38):675-680.
[7]罗忠涛,肖宇领,杨久俊,等.垃圾焚烧飞灰有毒重金属固化稳定技术研究综述[J].环境污染与防治,2012,34(8):58-62.
[8] POLETTINI A,POMI R,FORTUNA E.Chemical activation in view of MSWI bottom ash recycling in cement-based systems[J].Journal of Hazardous Materials,2009,162(2):1292-1299.
[9]黄健,吴笑梅,樊粤明,等.掺垃圾焚烧飞灰烧制的水泥熟料对水泥性能影响的试验研究[J].水泥,2008(9):1-3.
[10]梁梅,黎小保.生活垃圾焚烧飞灰基本特性及稳定化研究[J].环境卫生工程,2014,22(3):1-3
[11]罗忠涛,郑亚然,卢冰洁,等.不同掺量超危垃圾焚烧飞灰重构水淬渣-水泥性能及重金属浸出毒性研究[J].硅酸盐通报,2014,33(5):999-1003.
[12]REMOND S,BENTZ D,PIMIENTA P.Effects of the incorpo-ration of municipal solid waste incineration fly ash in cement pastes and mortars II modeling[J].Cement and Concrete Research,2002(32):565-576.
[13]张筠,董景峰,王琼,等.焚烧飞灰-水泥复合胶凝材料体系物理性能研究[J].粉煤灰,2008(2):34-37.
[14]刁玲玲,王帅,鲍清萍.城市垃圾焚烧炉渣重金属含量特征及其资源化利用途径[J].安徽农学通报,2012,18(24)218-221.
[15]刘汉桥,张书庭,张于峰,等.医疗垃圾焚烧飞灰的水泥固化效果试验[J].天津大学学报,2010,43(1):32-36.
[16]王卉.高炉熔渣形成过程及性能研究[D].北京:北京工业大学,2013.
[17]杨中正.无机胶凝材料[M].郑州:郑州大学出版社,2008:157.