不同激发方式对再生微粉性能的影响研究
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摘要
再生微粉是一种粒径小于0. 16 mm,颗粒形状不规则,且SiO_2、CaO、Fe_2O_3及Al_2O_3等氧化物含量较高的废弃混凝土粉末。本试验以砂浆抗压强度及微观结构为指标,研究了Ca(OH)_2、Na_2SiO_3·9H_2O化学激发剂以及600℃、800℃热处理等不同激发方式对再生微粉活性的激发效果。试验结果表明,再生微粉是一种"惰性物质",未经处理前不适合替代水泥。化学激发剂及热处理均可激发再生微粉的活性,激发后的再生微粉可以作为掺合料部分替代水泥。在28 d龄期时,800℃的热活化效果最好,Ca(OH)_2的激发效果次之,600℃的热活化效果最差。
The recycled concrete powder is a kind of waste concrete powder with smaller than 0. 16 mm diameter irregular shape and high oxide content such as SiO_2,CaO,Fe_2O_3 and Al_2O_3. Based on the compressive strength and microstructureof mortar,the excitation effect of Ca(OH)_2,Na_2SiO_3·9H_2O and thermal treatment at 600 ℃,800 ℃ on the activity of the recycled concrete powder was studied. The results show that the recycled concrete powder is a kind of " inert material",which is not suitable to replace cement before treatment. Both chemical activator and heat treatment can excite the activity of recycled concrete powder,and it can be used as admixture to replace cement partly. At 28 d of age,the best activation effect is at 800 ℃,the activation effect of Ca(OH)_2 is the second,and the thermal activation effect at 600 ℃ is the worst.
The recycled concrete powder is a kind of waste concrete powder with smaller than 0. 16 mm diameter irregular shape and high oxide content such as SiO_2,CaO,Fe_2O_3 and Al_2O_3. Based on the compressive strength and microstructureof mortar,the excitation effect of Ca(OH)_2,Na_2SiO_3·9H_2O and thermal treatment at 600 ℃,800 ℃ on the activity of the recycled concrete powder was studied. The results show that the recycled concrete powder is a kind of " inert material",which is not suitable to replace cement before treatment. Both chemical activator and heat treatment can excite the activity of recycled concrete powder,and it can be used as admixture to replace cement partly. At 28 d of age,the best activation effect is at 800 ℃,the activation effect of Ca(OH)_2 is the second,and the thermal activation effect at 600 ℃ is the worst.
引文
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[12]Moon D J,Kim Y B,Ryou J S.An approach for the recycling of waste concretepowders as cementitious materials[J].Ceramic Processing Research,2008,9(3):278-281.
[13]马郁.掺建筑垃圾再生微粉混凝土性能试验研究[J].混凝土与水泥制品,2016(10):88-90.
[14]刘小艳,金丹,刘开琼,等.掺再生微粉混凝土的早期抗裂性能[J].建筑材料学报,2010,13(3):398-402.
[15]Yong J K,Yun W C.Utilization of waste concrete powder as a substitution material for cement[J].Construction and Building Materials,2012,30:500-504.
[16]张利娟.再生微粉-水泥复合胶凝材料的水化性能[J].混凝土与水泥制品,2013(6):14-17.
[17]方倩倩,於林锋,王琼.建筑垃圾再生微粉用于混凝土的试验研究[J].固废利用,2015,27(3):27-29.
[18]余小小,李如燕,董祥,等.机械力粉磨对再生微粉性能的影响[J].人工晶体学报,2017,46(4):688-692.
[19]刘栋,张鹏宇,刘彤,等.建筑垃圾中再生微粉材性表征及潜在活性的激发[J].硅酸盐通报,2016,35(8):2635-2641.
[20]张圣彩,耿欧,赵桂云.再生微粉混凝土的抗压强度及其活性激发[J].混凝土,2015(11):49-52.
[21]Florea M V A,Ning Z,Brouwers H J H.Activation of liberated concrete fines and their application inmortars[J].Construction and Building Materials,2014,50:1-12.
[2]刘琼.再生微粉作为建筑垃圾再生利用新途径的探索[J].固废利用,2014,24(2):24-25.
[3]徐东.建筑废弃物再生产品在市政工程中的应用技术研究[J].城市道桥与防洪,2017(12):214-216.
[4]毛新奇,屈文俊,朱鹏.建筑垃圾再生微粉的研究现状[J].混凝土与水泥制品,2015(8):89-93.
[5]刘音,路畅,张浩强.建筑垃圾再生微粉胶凝性的研究[J].中国粉体技术,2015,21(5):33-36.
[6]杨虹,谢永滨,平乐,等.再生粗骨料对混凝土抗折强度影响的试验分析[J].特种结构,2017,34(6):77-82.
[7]吕洪淼.再生骨料混凝土力学物理特性试验研究[J].非金属矿,2018,41(3):46-48.
[8]陈耿.废弃混凝土再生粗骨料应用研究[J].广东建材,2018(1):13-16.
[9]张亚飞,安新正,牛薇,等.再生细骨料对再生骨料混凝土抗压性能影响研究[J].河北工程大学学报(自然科学版),2018,35(2):71-74.
[10]游帆,郑建岚.全再生骨料混凝土导热性能试验研究[J].福州大学学报,2018,46(3):391-395.
[11]戴鹏.废弃混凝土试块再生细骨料混凝土试验研究[J].砖瓦,2017(11):32-35.
[12]Moon D J,Kim Y B,Ryou J S.An approach for the recycling of waste concretepowders as cementitious materials[J].Ceramic Processing Research,2008,9(3):278-281.
[13]马郁.掺建筑垃圾再生微粉混凝土性能试验研究[J].混凝土与水泥制品,2016(10):88-90.
[14]刘小艳,金丹,刘开琼,等.掺再生微粉混凝土的早期抗裂性能[J].建筑材料学报,2010,13(3):398-402.
[15]Yong J K,Yun W C.Utilization of waste concrete powder as a substitution material for cement[J].Construction and Building Materials,2012,30:500-504.
[16]张利娟.再生微粉-水泥复合胶凝材料的水化性能[J].混凝土与水泥制品,2013(6):14-17.
[17]方倩倩,於林锋,王琼.建筑垃圾再生微粉用于混凝土的试验研究[J].固废利用,2015,27(3):27-29.
[18]余小小,李如燕,董祥,等.机械力粉磨对再生微粉性能的影响[J].人工晶体学报,2017,46(4):688-692.
[19]刘栋,张鹏宇,刘彤,等.建筑垃圾中再生微粉材性表征及潜在活性的激发[J].硅酸盐通报,2016,35(8):2635-2641.
[20]张圣彩,耿欧,赵桂云.再生微粉混凝土的抗压强度及其活性激发[J].混凝土,2015(11):49-52.
[21]Florea M V A,Ning Z,Brouwers H J H.Activation of liberated concrete fines and their application inmortars[J].Construction and Building Materials,2014,50:1-12.