水利学报2017，Vol.48Issue(2)：217-225,9.DOI:10.13243/j.cnki.slxb.20160464
高寒高海拔地区碾压混凝土孔系定制设计研究
Study on pores customized design in RCC in extremely cold and high altitude area
摘要
Abstract
The high adsorption of unburned carbon in fly ash to polar material such as air-entraining admixture (AEA) could interfere the formation of air structure and its stability.In addition,the impact of environmental pressure on air entrainment also results in reduction in the air content of concrete.Therefore,it is rather difficult to entrain air voids into high-volume fly ash roller compacted concrete especially in the extremely cold and high altitude areas.This paper presents a study on the development of a new type of modified absorbent polymer (MAP) to totally replace conventional air-entraining agent as anti-freezing agent for RCC.Based on MAP features,the method to design and customize the pores system matching up RCC freeze-thaw property was proposed.Comparative studies of influence of various air entrained materials including MAP and AEA on performances of RCC were also carried out.When the MAP content and particle size were appropriate,an effectiveness pores system was formed,contributing to significantly improve freeze-thaw resistance with great increase in strength.Finally,to controllably design the pores radium and content created by MAPs in RCC was realized.关键词
高寒高海拔/碾压混凝土/改性吸水树脂/定制造孔/抗冻性能Key words
extremely cold and high altitude/roller compacted concrete/modified absorbent polymer/pore customization/freeze-thaw resistance分类
建筑与水利引用本文复制引用
杨华美,何真..高寒高海拔地区碾压混凝土孔系定制设计研究[J].水利学报,2017,48(2):217-225,9.基金项目
国家973项目(2013CB035901,2015CB655101) （2013CB035901,2015CB655101）
