摘要
为了保证含盐陶粒混凝土路面具有良好的除冰雪耐久性,消除含盐陶粒离析分层对混凝土性能的不利影响,采用分层度试验对影响含盐陶粒混凝土匀质性的因素进行了分析.结果表明:合理的砂率能有效提高混凝土拌合物中水泥砂浆的黏度,当砂率为36%时含盐陶粒混凝土的抗分层和抗离析性能最好;用粉煤灰替代部分水泥能降低水泥砂浆与含盐陶粒的密度差异,改善混凝土拌合物的工作性,有效减弱含盐陶粒的上浮;一定时长的振捣使得混凝土胶凝材料与水充分接触,混凝土拌合物的黏度系数明显提高,过度振捣会导致含盐陶粒大量上浮;优化材料组成,严格控制含盐陶粒混凝土的振捣时长,可以保证含盐陶粒的分布与集料替代比例的关系趋于一致.
To ensure good deicing and snow melting durability of salt-containing ceramsite concrete pavement and eliminate the adverse effects of stratification of salt-containing ceramsite on concrete performance the factors that influence the homogeneity of salt-containing ceramsite concrete were analyzed through segregation experiments.Results show that reasonable sand ratio can effectively improve the viscosity of cement mortar in concrete mixture.When the sand ratio is 36%,the anti-delamination and anti-segregation performance of salt-containing ceramsite concrete is the best.The replacement of fly ash to cement can reduce the density difference between cement mortar and salt-containing ceramsite,which can improve the workability of concrete mixture and effectively reduce the floatation of salt-containing ceramsite.With a certain vibration time it can make the cementitious material of concrete fully contact with water,the viscosity coefficient of concrete mixture obviously increases,and excessive vibration leads a large amount of salt-containing ceramsite floating.By optimizing the material composition and strictly controlling the vibrating time of salt-containing ceramsite concrete,it is possible to ensure that the distribution of salt-containing ceramsite is in line with the proportion of aggregate replacement.
作者
侯子义
李虹橙
郑少鹏
李思李
程志豪
HOU Ziyi;LI Hongcheng;ZHENG Shaopeng;LI Sili;CHENG Zhihao(School of Civil and Transportation,Hebei University of Technology,Tianjin 300401,China;Research Institute of Highway,Ministry of Transport,Beijing 100088,China;Broadvision Engineering Consultants,Kunming 650041,China;School of Civil Engineering,Chongqing Jiaotong University,Chongqing 400074,China)
出处
《北京工业大学学报》
CAS
CSCD
北大核心
2020年第8期956-962,共7页
Journal of Beijing University of Technology
基金
云南省交通运输厅科技项目(云交科2014(A)07)
云南省交通规划设计研究院科技项目(ZL-2015-04)
云南省应用基础研究计划面上项目(2016FB099)。
关键词
道路工程
含盐陶粒混凝土
融冰雪
分层度
匀质性
耐久性
road engineering
salt-containing ceramsite concrete
ice and snow melting
segregation degree
homogeneity
durability
