不同取代率下再生混凝土的抗冻融性能试验
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摘要
采用快冻法对9种再生混凝土进行了冻融循环试验。分析了经受100次冻融循环后不同取代率下再生粗骨料和再生细骨料对混凝土立方体抗压强度的影响;研究了每25次冻融循环后再生混凝土的棱柱体质量损失率和相对动弹性模量的变化;比较了100次冻融循环作用对不同取代率下再生混凝土抗压承载力的影响。结果表明,再生混凝土抗冻融性能有所下降,且降低幅度随再生骨料取代率的增加而加剧;100次冻融循环后,再生粗骨料取代率为50%,细骨料为天然骨料的再生混凝土,其质量损失率、相对动弹性模量衰减幅度和抗压承载力损失率均与普通混凝土接近,建议再生粗骨料掺量不高于50%的再生混凝土可在寒冷地区推广应用。
Fast freeze-thaw tests were carried out on nine kinds of recycled concrete to study the effects of the type of recycled aggregate and its substitution ratio on the frost resistance of recycled concrete.Based on the experiment,the effect of the type of recycled aggregate and the replacement percentage on the cubic compressive strength after 100 freeze-thaw cycles was analyzed.Variation regularity of mass loss rate and relative dynamic modulus of elasticity was studied after every 25 cycles of freezing and thawing.Influence of the100 freeze-thaw cycles on the load-carrying capacity of recycled concrete prisms with different replacement rates was compared.Experiment results show that the performance of recycled concrete to resist freeze-thaw action is reduced compared with normal concrete,and the reduction range increases with the increasing replacement ratio of recycled aggregate.After 100 freeze-thaw cycles,recycled concrete with 50% displacement of the recycled coarse aggregate and natural fine aggregate has similar durability compared with ordinary concrete in mass loss rate,attenuation amplitude of relative dynamic modulus of elasticity and loss rate of the bearing capacity.Recycled concrete with no more than 50% replacement of recycled coarse aggregate is suggested to use for building structures in cold weather areas.
Fast freeze-thaw tests were carried out on nine kinds of recycled concrete to study the effects of the type of recycled aggregate and its substitution ratio on the frost resistance of recycled concrete.Based on the experiment,the effect of the type of recycled aggregate and the replacement percentage on the cubic compressive strength after 100 freeze-thaw cycles was analyzed.Variation regularity of mass loss rate and relative dynamic modulus of elasticity was studied after every 25 cycles of freezing and thawing.Influence of the100 freeze-thaw cycles on the load-carrying capacity of recycled concrete prisms with different replacement rates was compared.Experiment results show that the performance of recycled concrete to resist freeze-thaw action is reduced compared with normal concrete,and the reduction range increases with the increasing replacement ratio of recycled aggregate.After 100 freeze-thaw cycles,recycled concrete with 50% displacement of the recycled coarse aggregate and natural fine aggregate has similar durability compared with ordinary concrete in mass loss rate,attenuation amplitude of relative dynamic modulus of elasticity and loss rate of the bearing capacity.Recycled concrete with no more than 50% replacement of recycled coarse aggregate is suggested to use for building structures in cold weather areas.
引文
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[17]混凝土结构设计规范[S].GB 50010-2010.北京:中国建筑工业出版社,2010.
[2]S.Nangataki,A.Gokce,et al.Assessment of Recycling Process Induced Damage Sensitivity of Recycled Concrete Aggregates[J].Cem Concr Res.,2004,34(6):965~971.
[3]D.N.Oikonomou.Recycled Concrete Aggregates[J].Cem Concr Res.,2005,27(2):315~318.
[4]J.M.Khatib.Properties of Concrete Incorporating Fine Recycled Aggregate[J].Cem Concr Res.,2005,35(4):763~769.
[5]张士萍,邓敏,唐明述.混凝土材料损伤机理(英文)[J].材料科学与工程学报,2004,30(2):182~187+170.
[6]杜鹏,姚燕,王玲,王阵地,曹银.混凝土冻融损伤演化方程的初步建立[J].材料科学与工程学报,2013,31(4):540~543.
[7]张士萍,邓敏,唐明述.混凝土冻融循环破坏研究进展[J].材料科学与工程学报,2008,26(6):990~994.
[8]S.Omary,E.Ghorbel,G.Wardeh.Relationships between Recycled Concrete Aggregates Characteristics and Recycled Aggregates Concretes Properties[J].Constr Build Mater,2016,108:163~174.
[9]R.M.Salem,E.G.Burdette.Role of Chemical and Mineral Admixtures on the Physical Properties and Frost-resistance of Recycled Aggregate Concrete[J].ACI Mater J,1998,95(5):558~563.
[10]A.Richardson,K.Coventry,J.Bacon.Freeze/thaw Durability of Concrete with Recycled Demolition Aggregate Compared to Virgin Aggregate Concrete[J].J Clean Prod.,2011,19(2~3):272~277.
[11]R.M.Salem,E.G.Burdette,N.M.Jackson.Resistance to Freezing and Thawing of Recycled Aggregate Concrete[J].ACI Mater J,2003,100(3):216~221.
[12]A.R.Zaharieva,F.Buyle-Bodin,E.Wirquinc.Frost Resistance of Recycled Aggregate Concrete[J].Cem Concr Res.,2004,34(10):1927~1932.
[13]S.T.Yildirim,C.Meyer,S.Herfellner.Effects of Internal Curing on the Strength,Drying Shrinkage and Freeze-thaw Resistance of Concrete Containing Recycled Concrete Aggregates[J].Constr Build Mater,2015,91:288~296.
[14]J.A.Bogas,J.de Brito,D.Ramos.Freeze-thaw Resistance of Concrete Produced with Fine Recycled Concrete Aggregates[J].J Clean Prod.,2016,115:294~306.
[15]普通混凝土力学性能试验方法标准[S].GB/T 50081-2002.北京:中国建筑工业出版社,2002.
[16]普通混凝土长期性能和耐久性能试验方法标准[S].GB/T50082-2009.北京:中国建筑工业出版社,2009.
[17]混凝土结构设计规范[S].GB 50010-2010.北京:中国建筑工业出版社,2010.