机场道面再生混凝土的抗冻性能及机理  

Frost-resistant performance and mechanism of recycled concrete for airport pavement

作　　者：刘庆涛[1] 岑国平[1] 蔡良才[1] 吴和胜[2] 

机构地区：[1]空军工程大学工程学院,陕西西安710038 [2]空军第六空防工程处,湖南衡阳421001

出　　处：《华中科技大学学报（自然科学版）》2011年第12期128-132,0,共5页Journal of Huazhong University of Science and Technology(Natural Science Edition)

基　　金：军队科研基金资助项目(KH0706014)

摘　　要：为了研究机场道面再生混凝土的抗冻性能及其机理,采用掺加优质粉煤灰和高效外加剂的'双掺'技术路线,进行机场道面再生混凝土配合比设计和抗冻性能研究.根据机场道面再生混凝土抗冻试验结果和试件破坏现象,探讨了再生混凝土抗冻性能评价指标.从含气量、孔结构和微观结构等方面,对机场道面再生混凝土的抗冻机理进行了分析,建议寒冷地区道面再生混凝土含气量为5%～6%,在再生混凝土中掺入优质矿物外掺料,提高机场道面再生混凝土的抗冻性能.结果表明:所配制的机场道面再生混凝土抗冻等级高达F250,抗冻性能优于普通道面混凝土,满足道面设计规范要求.In order to study the frost-resistant performance and mechanism of the airport pavement recycled concrete,the ＂double mixing＂ technique with high quality fly ash and high efficiency admixture was adopted,then the mix proportion design of pavement recycled concrete was optimized and the frost-resistant performance was studied.Based on the testing results and the destroy phenomenons of the specimens,the frost-resistance performance evaluating indicators of the recycled concrete was discussed,and the frost-resistant mechanism of recycled concrete for airport pavement was analyzed in aspects of the air capacity,the micro-pore structure,the microstructure.It is suggested that the air capacity of the recycled concrete for pavement in the chilly area is 5%～6%,and high quality mineral admixtures should be added to the recycled concrete for pavement to improve the frost-resistance performance of the recycled concrete.The testing results show the frost-resistance grade of the recycled concrete for airport pavement is up to F250,the frost-resistance performance is superior to ordinary pavement concrete,which can meet the requirement of the pavement design specifications.

关 键 词：机场工程 混凝土道面 再生混凝土 抗冻性能 微观结构 机理 

分 类 号：TU528.37[建筑科学—建筑技术科学]